Scielo RSS <![CDATA[Revista chilena de anatomía]]> https://scielo.conicyt.cl/rss.php?pid=0716-986819990002&lang=es vol. 17 num. 2 lang. es <![CDATA[SciELO Logo]]> https://scielo.conicyt.cl/img/en/fbpelogp.gif https://scielo.conicyt.cl <![CDATA[EDITORIAL]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200001&lng=es&nrm=iso&tlng=es <![CDATA[ANALISIS DEL PRINCIPAL COMPONENTE DEL CRECIMIENTO METATARSAL FETAL HUMANO EN EL SEGUNDO TRIMESTRE GESTIONAL]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200002&lng=es&nrm=iso&tlng=es Se realizó un estudio de 800 huesos metatarsales retirados de 80 pares de pies de fetos humanos de gestación única. Los fetos con edades de 13 a 24 semanas post concepción (45 hombres y 35 mujeres), fueron fijados en formol al 10%, por 30 días. Fueron medidos la longitud total del hueso y la longitud y el diámetro de la diáfisis osificada. La matriz de covarianza fue calculada y el crecimiento relativo de las medidas fueron computados a través del análisis del componente principal (ACP). Para ambos sexos, el primer componente fue 82.7% de la varianza total y todos los caracteres fueron positivamente correlacionados con este componente. Ninguna medida fue considerada de crecimiento isométrico (p&lt;0.01). La ACP indicó que la longitud total y el diámetro de la diáfisis crecieron con alometría negativa y la longitud de la diáfisis osificada con alometría positiva. Las diferencias entre ambos sexos no fueron significativas (p0.05). Estos resultados son útiles en la valoración prenatal de la edad gestacional que usa la longitud metatarsal como referencia anatómico <![CDATA[ORIGIN AND DISTRIBUTION OF THE BASILAR ARTERY IN THE ENCEPHALON OF ZEBUINE BOVINE FETUSES]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200003&lng=es&nrm=iso&tlng=es En el presente trabajo utilizamos 30 encéfalos de fetos de bovinos cruzados con cebú, inyectados con látex coloreado rojo y fijados en solución de formaldehido al 20%, seguido de una minuciosa disección. La arteria basilar tiene origen a partir de la convergencia del ramo caudal de la arteria carótida del encéfalo (antímeros derecho e izquierdo), en el 100% de los casos, evidenciando una disminución progresiva de su calibre rostro-caudal. Esto sugiere que el flujo sanguíneo se produciría en tal sentido, donde existen algunas ramas colaterales de la arteria basilar: arteria cerebelar caudal y arterias que se dirigen al puente y a la médula oblonga <![CDATA[ESTUDIO SOBRE LA RAMIFICACION DE LA ARTERIA SACRAL MEDIANA Y LA TEMPERATURA CORPORAL DEL ARMADILLO (<I>Dasypus novemcinctus</I>)]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200004&lng=es&nrm=iso&tlng=es El conjunto de vasos formados por la ramificación de la arteria sacral mediana fue estudiado en 20 armadillos (Dasypus novemcinctus). Este conjunto, que ha sido considerado una rete mirabile, se extiende desde la región sacral de la columna vertebral hasta la base de la cola. La conformación de las arterias y sus venas paralelas da origen a un sistema de contra-corriente que seguramente previene de la disipación de calor a través de la cola y, de esta manera, contribuye con los mecanismos del control de la temperatura corporal del armadillo <![CDATA[OBSERVACIONES ULTRAESTRUCTURALES DEL LOBULO DORSAL DE LA PROSTATA DE RATAS (<I>Rattus norvegicus</I>) SOMETIDAS A LA INGESTION EXPERIMENTAL CRONICA DE ALCOHOL]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200005&lng=es&nrm=iso&tlng=es Los problemas relacionados al consumo abusivo de bebidas alcohólicas, son una de las preocupaciones de salud pública más discutidas. Se han estudiado las alteraciones morfológicas y funcionales causadas por ingestión crónica de alcohol en los testículos y órganos sexuales accesorios de los hombres y de los animales de laboratorio. El objetivo de este trabajo fue examinar los eventuales cambios morfológicos en el epitelio secretorio del lóbulo dorsal de la próstata, en ratas sometidas a la ingestión crónica de alcohol. Las ratas adultas en el grupo experimental fueron divididas según los períodos del tratamiento de 60, 120, 180, 240 y 300 días, recibiendo para beber sólo alcohol de caña de azúcar de 30&amp;ordm; (30% v/v) y fueron alimentadas con ración de Purina a voluntad. Al final de cada período de tratamiento, cuatro ratas de cada grupo fueron anestesiadas por inhalación de éter y perfundidas con 2,5% glutaraldeido y fragmentos del lóbulo dorsal fueron removidos y procesados para la microscopía electrónica. Los resultados demostraron a nivel celular reducción general del citoplasma y del retículo endoplasmático granular, así como también formación circular que consiste en membranas concéntricas en la región apical de las células epiteliales secretorias del lóbulo dorsal. La ingestión crónica del alcohol tuvo efectos deletéreos en las células epiteliales secretoras del lóbulo dorsal de la próstata, después de los diferentes períodos del tratamiento <![CDATA[BIOMETRIA DE LA ARTERIA CEREBELAR ANTERIOR-INFERIOR EN EL SEGMENTO PONTINO-ANTERIOR Y LATERAL]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200006&lng=es&nrm=iso&tlng=es The clinical physicians insist in the necessity of an anatomical precise knowledge, for the success in neurochirurgical interventions during the approaching to the posterior cranial fossa. Based in previous reports, we have made an anatomical revision of the anterior inferior cerebellar artery focused to its anterior pontine and lateral pontine segments with data that may contribute to their better knowledge. This research was done by the study of 70 human brains from both sexes, collected at Sâo Paulo Medical School/ UNIFESP, Brazil, and to which them , we registred some anthropological data. The brains were inyected in its vascular system with red collored neopren latex and fixed using established anatomical techniques. The range of 1.0-1.5 mm for the external diameter of the AICA is more frecuently at right side in both sexes; in 47.4% of the Brachycephalics (BH) and in 53.1% of the Dolicho-mesocephalics (DM). At the left side and masculine sex, was observed in 45.3% and in 64.3% of feminine sex ; in 52.7% of the BH and in 53.1% of the DM. The course of the AICA at right side is ventral to abducent nerve (AN) in 68.0% in DM groups and in 69.0% in BH groups; at the left side this course was observed in 74.0% in DM and 77.0% in BH groups. The authors insist in the variability observed in the arterial patterns, when taking in consideration besides side and sex, other parameters like the cephalic index <![CDATA[ASPECTOS MORFOLOGICSO DEL ENDOMETRIO DE RATAS EN ESTRO PERSISTENTE, INDUCIDO POR LUZ CONTINUA, SOMETIDAS A OOFORECTOMIA Y TRATADAS CON ESTROGENOS Y/O PROGESTOGENOS]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200007&lng=es&nrm=iso&tlng=es Los principales objetivos de este trabajo son analizar las modificaciones que ocurren en el endométrio de ratas en estro persistente inducida por luz contínua y observar la respuesta endometrial a administración de estrógenos y/o progestágenos sobre el endometrio, en esas condiciones experimentales. Los resultados mostraron que el estroma endometrial de ratas sometidas a luz continua presentaba características típicas de la fase de estro, siendo que los epitelios superficial y glandular presentaban áreas de estratificación, dependientes de las hormonas ováricas y que tales características desaparecen después de la ooforectomía. La ooforectomía no bloquea el efecto inducido por la luz, ya que después de la administración del estrógeno, el endometrio presentaba las mismas características de los animales en estro persistente. Cuando se administró el acetato de medroxiprogesterona juntamente con el estrógeno, hubo un bloqueo de las áreas de estratificación, indicando que la progesterona es moduladora del estrógeno. En este trabajo concluimos que el estro persistente inducido por la luz continua, depende de las hormonas ováricas y que la principal hormona es estrógeno. También se observó que la progesterona bloquea las inducciones provocadas por el estrógeno <![CDATA[LOS GIROS DEL LOBULO FRONTAL: ESTUDIO POSTMORTEM]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200008&lng=es&nrm=iso&tlng=es The objective of the present work was to study the lobus frontalis in postmortem human brains in order to obtain weight as well as superficial and deep cortex values of the lobus and its gyri and quantitative ratios among these values. Twelve brains obtained from right-handed subjects aged between 30 and 55 years having no visible macroscopic neurologic lesions were fixed in formaldehyde (5%) and processed using a method developed in our laboratory (Arch. Neurol., 46:307; 1989). Absolute and percent values, as well as weight/cortical surface ratios and correlations of the gyri of the lobus frontalis - regio orbitalis, cinguli, superior+medium, inferior and precentralis - were obtained. The cortical surface of the right gyrus cinguli is significantly larger than the contralateral one. The statistically lower weight/cortical surface ratio corresponds to the regio orbitalis and the higher one to the gyrus precentralis. The regio orbitalis supplies a higher percentage in cortical surface than in weight to its respective lobus frontalis; the opposite occurs with the gyrus precentralis. The right gyrus cinguli supplies a higher percentage in weight than in cortical surface than the left one. The Pearson coefficient of correlation between the values (absolute and percent) corresponding to weight and cortical surface between homologous gyri of both hemispheres are positive.The correlations between weight absolute as well as percent values and those of the respective cortical surface are positive, excellent and highly significant. The higher percentage of cases with right laterality corresponds to the gyrus cinguli and that with left laterality to the gyrus frontalis inferior. Modifications that could occur in brains from psychiatric and neurologic patients could alter some of these values and relationships, as for example in schizophrenia in which we found an inversion of the gyrus cinguli anterior laterality (<A HREF="#albanese95">ALBANSE et al., 1995</A>) <![CDATA[HISTOLOGIA TESTICULAR HUMANA COMPARADA, ADULTO JOVEN Y SENIL]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200009&lng=es&nrm=iso&tlng=es In general, sperm production decreases with advanced age in men. Therefore the present work compares the histology and cellularity of aging human testis with that of a young adult. Gonads from three patients 69 years old and testis from a young subject (aged 25 years) were examined after histological standard techniques (PAS-Haematoxyline). Histological, morphometric and cell counting analyses of testicular sections revealed that the seminiferous tubules of senile patients were of smaller diameter, with lower seminiferous epithelium, incomplete germ cell line and vacuolization of the epithelium. Sertoli cells showed a market quantitative decrease, similar to the spermatogonial and primary spermatocyte population. It is possible to postulated that in the senile individues there is a programmed damage of seminiferous epithelial cells that may result in lowered sperm production <![CDATA[ESTUDIO COMPARATIVO ENTRE LA MASA OSEA EVALUADA POR PROTOCOLOS KINEANTROPOMETRICOS V/S DENSIDAD OSEA MEDIDA POR DENSITOMETRIA FOTONICA DUAL: COMPARATIVE STUDY AMONG KINANTHROPOMETRIC BONE MASS V/S DUAL FOTONIC BONE DENSITY]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200010&lng=es&nrm=iso&tlng=es Bone mass (BM) determination according to kineantropometric methods is usually made on each model of a new corporal fractionation. The cadaverous validation of these methods is scarce, except from the model of <A HREF="#kerr88">KERR (1988)</A> and the cadaverous study of Brussels, <A HREF="#clarys">CLARYS et al. (1984)</A>, therefore, to attain a validation according to modern methodology and up to date could contribute important background in the study of the osteo-calcic metabolism. Nowadays, the evaluation of the bone mineral density (BMD) and the bone mineral content (BMC) by means of the fotonic dual absorciometry, widely known as osseous densitometry (OD) are recognised; consequently, the validation of the antropometric formulae of MO v/s DO could contribute reliable data of the osseous condition of the body. The subjects are 19 volleyball players, 10 men and 9 women, from university teams, whom were first kineantropometrically evaluated-according to the rules of the International Society for Advances in Kineatropometry (ISAK)- and, immediately after, underwent a full-length DO in a Fotonic Dual Densytometer (NORLAND XR 26, Mark II, 1994). We set up the correlations between the BMC and the BMD v/s the following antropometric estimations of MO: D. Kerr, Von Dobeln and Makiegka modified by <A HREF="#martin">A. Martin (1984)</A>. The results show correlations statistically significant among the different models v/s DO (p&lt;0.05); however, the determination coefficient (r2) do not reach 50%. These results suggest that when there is a relation statistically significant, the MO antropometric models for the estimation of the MO could not estimate BMC nor BMD, this is because the concept of the osseous density is not related with the osseous weight in a 100%, since this one, apart from containing minerals, contains water and organic matter <![CDATA[EVIDENCIAS INMUNOCITOQUIMICAS SOBRE LA PRESENCIA DE LA SERPINA CBG-símil EN EL SISTEMA REPRODUCTOR DE LA HEMBRA EN BOVINOS]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200011&lng=es&nrm=iso&tlng=es Bone mass (BM) determination according to kineantropometric methods is usually made on each model of a new corporal fractionation. The cadaverous validation of these methods is scarce, except from the model of <A HREF="#kerr88">KERR (1988)</A> and the cadaverous study of Brussels, <A HREF="#clarys">CLARYS et al. (1984)</A>, therefore, to attain a validation according to modern methodology and up to date could contribute important background in the study of the osteo-calcic metabolism. Nowadays, the evaluation of the bone mineral density (BMD) and the bone mineral content (BMC) by means of the fotonic dual absorciometry, widely known as osseous densitometry (OD) are recognised; consequently, the validation of the antropometric formulae of MO v/s DO could contribute reliable data of the osseous condition of the body. The subjects are 19 volleyball players, 10 men and 9 women, from university teams, whom were first kineantropometrically evaluated-according to the rules of the International Society for Advances in Kineatropometry (ISAK)- and, immediately after, underwent a full-length DO in a Fotonic Dual Densytometer (NORLAND XR 26, Mark II, 1994). We set up the correlations between the BMC and the BMD v/s the following antropometric estimations of MO: D. Kerr, Von Dobeln and Makiegka modified by <A HREF="#martin">A. Martin (1984)</A>. The results show correlations statistically significant among the different models v/s DO (p&lt;0.05); however, the determination coefficient (r2) do not reach 50%. These results suggest that when there is a relation statistically significant, the MO antropometric models for the estimation of the MO could not estimate BMC nor BMD, this is because the concept of the osseous density is not related with the osseous weight in a 100%, since this one, apart from containing minerals, contains water and organic matter <![CDATA[IMPACTO DE DOS PROGRAMAS COMPUTACIONALES DE ANATOMIA HUMANA EN EL RENDIMIENTO DEL CONOCIMIENTO PRACTICO DE LOS ALUMNOS]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200012&lng=es&nrm=iso&tlng=es En los últimos años se ha puesto de moda el uso de software docentes en los cursos de Anatomía. Incluso, algunas Escuelas de Medicina han cometido el error de utilizar en sus cursos sólo este tipo de tecnología. Este trabajo docente experimental analiza el impacto de dos software docentes de Anatomía, en el reconocimiento práctico de estructuras del cuerpo humano. El software A presenta esquemas anatómicos interactivos, en cambio el software B presenta además, fotos animadas de disecciones anatómicas. Los resultados muestran claramente que la transferencia del reconocimiento desde el esquema a la disección anatómica es de bajo rendimiento. Esta situación es superada ampliamente cuando se compara con la transferencia de reconocimiento desde fotos animadas de disecciones anatómicas a estructuras anatómicas del cuerpo humano. Sin embargo, es inobjetable, que la experiencia multisensorial del paso práctico es la actividad que presenta el mejor rendimiento en relación al reconocimiento de estructuras anatómicas<hr/>Recently the use of teaching software for Anatomy courses has been widely used. In fact some Schools of Medicine have committed the mistake to use in their courses only this type of technology. This experimental teaching work analyzes the impact of two software in anatomy upon the practical recognition of the human body structures. Software A presents anatomical interactive diagrams. On the other hand software B presents besides the mentioned diagrams animated photographs of anatomical dissections . The results shows clearly that the transference of knowledge from diagrams to anatomical dissections is low in performance. This condition is overcome widely when we compare the transference of the knowledge from animated photographs of anatomical dissections to anatomical structures of the human body. However there is no doubt that the multisensorial experience of the practical work shows the best performance in relation to the recognition of the different anatomical structures <![CDATA[ASPECTOS HISTOLOGICOS DE LA ARTICULACION MANUBRIOESTERNAL]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200013&lng=es&nrm=iso&tlng=es The manubriosternal joint has been a matter of histological and anatomical discussion due to diversity of clasifications. It has been described as sinfisis, cartilagonous primary joint, synchondrosis or as a synovial joint. The objetive of this study was to determine the type of tissue that from this structure. Sternons were obtained from 10 chilean male cadavers ( 7 fresh and 3 formalized), 40 to 60 years old. The manubriosternal joint was examined macro and microscopally. Each joint was identified and the manubriosternal joint was examined sectioning the bone 1 cm above and 1 cm below the inter articular line. The segments were descalcified and 9 pieces were obtained in anteroposterior sections: 3 from the median part of the joint and 3 from each lateral proximal part of the sternocostal joint. The samples were stained with hematoxiline-eosin stain and van Giesson. The histologic examination determined, that in 5 cases (50%) the was a fine periferic layer of hialinic tissue. This tissue covered the surfaces articulars of the manubrium and sternal body. It was also found, between both surfaces a moderate (+++) fibrocartilaginous tissue in 3 cases (30%) was found a hialinic tissue between the articulars surfaces and abound fibrocartilaginosus tissue (+++) and in 2 cases (20%), the cartilaginosus tissues thar covered the articulars surfaces was abound with minimum fibrocartilaginous (++) in the central region. In 6 cases (60%) there was a small cavity in the fibrocartilaginous. The manubriosternal joint presented their surfaces covered with cartilaginosus tissue of hialinic type in relation with fibrocartilaginous tissue. This last tissue was a real disc between the articulars surface. In the majority of the cases was found a small cavity, perhaps due to the absortion that its central part suffers this loock more like a synovial joint than a synchondrosis. This could be due to a periferic calcification or to a sinostosis manubriosternal. In conclusion, this joint could be defined as a sinfisis. This reminded an old clasification that defined it as "diartroanfiartrosis", a transition joint between the synovial articulations and cartilaginosus <![CDATA[INTOXICACION CON ION COBRE EN RATAS PREÑADAS Y SU EFECTO EN LA FORMACION DE CENTROS PRIMARIOS DE OSIFICACION EN FETOS]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200014&lng=es&nrm=iso&tlng=es The social and economic activity in the 2nd Region of Chile is copper mining, generating subproducts which are eliminated in the environment. It has been reported that in industrialized centers, there is a transference of heavy metals from the mother to the fetus by placental transfer. It's proposed to know the bioaccumulation of copper in organs and fluids of pregnant rats and its effects on the primary ossification centers (POC). Three month female albine rats (Sprague Dowley), are cycled and mated in estrous. On the 8th gestation day, they are injected intraperitoneally with 1 ml of CuSO4 in concentrations 1024, 512, 256, 128, 64 ppm and physiological serum. After 18 days, the female are sacrificed and the fetus evaluated and processing with alizarin red stainig skeleton and histologic technique, 5 mm tissue sections are stained with alcian blue and/or toluidine blue. Maternal blood is obtained, as well as, fetal liver, and fetus, placenta, amniochorion membrane, and amniotic fluid for determining copper levels by means spectrophotometry of atomic absorption. In addition, fetus are checked for external visible malformation. The statistical study was carried out through variance analysis ANOVA, multiple comparison test (LSD), bilateral Fisher test, Kruskal Wallis test. The results show a high and statistically significant levels of copper in fetal liver of the intoxicated groups and control (p&lt;0.01). There are no differences of the chemical in maternal blood, amniotic fluid, amniochorion membrane and placenta between intoxicated and control groups. A significant difference in POC formation in cervical and dorsal vertebras was found with the treatment of 256 ppm compared to the control group (p&lt;0.05). It wasn't observed external abnormalities. It is inferred that copper ion is it's placental transferred to the fetus via placenta bioaccumulating in the liver inducing alterations in the POC formation , specially in cervical and dorsal vertebra level, which microscopically shows absence of characteristic hyaline cartilage tissue <![CDATA[ARCO PLANTAR SUPERFICIAL EN EL HOMBRE: CARACTERISTICAS ANATOMICAS Y COMPARADAS]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200015&lng=es&nrm=iso&tlng=es The human foot irrigation is different of the simian which presents frequently two plantar networks, superficial and deep. Generally, in man there is not a very developed superficial arch. This fact lead us to think in a functional adaptation undergone by the foot through the times. In order to verify the presence and anatomical characteristics of the human superficial plantar arch, we studied 50 feet from 25 adult cadavers, of both sexes, all Brazilians. The arch was present in only 7 cases (14.0%), ever unilateral and located in the distal part of the middle third of the foot. The diameter of this arch did not exceed 1.0 mm. The branches originated from this arterial formation were between 2 and 4, which bound to the plantar superficial structures following the common plantar digital nerves. Due to the presented characteristics we believe that the superficial plantar arch would be beyond of an anatomical variation, a vestige of our evolution <![CDATA[IRRIGACION DEL PULGAR: CONSTITUCION DE SUS ARTERIAS DIGITALES PALMARES PROPIAS]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200016&lng=es&nrm=iso&tlng=es The thumb is very important for the hand function mainly by its oposition capacity. Their arteries are branches of two important antebrachial arteries, radial and ulnar. With the purpose to know more details over the formation of the proper palmar digital arteries of the thumb, we studied 60 hands from adult cadavers of both sexes, all of brazilian origin. Their arteries were injected with latex neoprene. The princeps pollicis artery was found in 59 cases (98.3%) and it originated from the radial artery or one of its branches after this one have passed through the first interosseous space in 54 (90%); this artery arose before the radial artery or one of its branches have passed through the mentioned space above in 5 (8.3 %), in these cases the princeps pollicis artery ran dorsal and superficially. The radial proper palmar digital artery of the thumb was formed by: one branch of the princeps pollicis artery in 25 cases (44.6%); by one branch of the last mentioned artery plus a branch from the superficial palmar arch in 14 (25%); by one branch from the princeps pollicis artery plus one branch from the median artery in 8 (14.3%). The ulnar proper palmar digital artery of the thumb was formed by: one branch from the princeps pollicis artery plus one branch from the superficial palmar arch in 40 cases (71.4%); by one branch of the princeps pollicis artery plus one branch from the median artery in 6 (10.7%); by one branch from the princeps pollicis artery plus one branch from the superficial palmar branch of the radial artery in 4 (7.1%). Thumb irrigation is mainly subject to the princeps pollicis artery which receive frequently branches from the superficial palmar arteries <![CDATA[<I>PROFESOR DR. ANDRE DELMAS</I> <I>(1910 - 1999)</I>]]> https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-98681999000200017&lng=es&nrm=iso&tlng=es The thumb is very important for the hand function mainly by its oposition capacity. Their arteries are branches of two important antebrachial arteries, radial and ulnar. With the purpose to know more details over the formation of the proper palmar digital arteries of the thumb, we studied 60 hands from adult cadavers of both sexes, all of brazilian origin. Their arteries were injected with latex neoprene. The princeps pollicis artery was found in 59 cases (98.3%) and it originated from the radial artery or one of its branches after this one have passed through the first interosseous space in 54 (90%); this artery arose before the radial artery or one of its branches have passed through the mentioned space above in 5 (8.3 %), in these cases the princeps pollicis artery ran dorsal and superficially. The radial proper palmar digital artery of the thumb was formed by: one branch of the princeps pollicis artery in 25 cases (44.6%); by one branch of the last mentioned artery plus a branch from the superficial palmar arch in 14 (25%); by one branch from the princeps pollicis artery plus one branch from the median artery in 8 (14.3%). The ulnar proper palmar digital artery of the thumb was formed by: one branch from the princeps pollicis artery plus one branch from the superficial palmar arch in 40 cases (71.4%); by one branch of the princeps pollicis artery plus one branch from the median artery in 6 (10.7%); by one branch from the princeps pollicis artery plus one branch from the superficial palmar branch of the radial artery in 4 (7.1%). Thumb irrigation is mainly subject to the princeps pollicis artery which receive frequently branches from the superficial palmar arteries