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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

OLAVE, E.  and  BRAGA, M. T. T.. INNERVATION OF THE SEMITENDINOUS MUSCLE, BIOMETRY OF THE BRANCHES  AND LOCATION OF ITS MOTOR POINTS. Int. J. Morphol. [online]. 2003, vol.21, n.2, pp.161-165. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022003000200011.

Motor innervation of skeletal muscle are quite understood, despite neural patterns and also nerve motor distributions are described in general manners. In order to improve anatomical and biometrical knowledge on these subjects, we explore in this work, the semitendinous muscle innervation and also their origin and disposition, which are associated to the ischiatic tuberosity (IT), we also referred to their length, division on their principal branches, as well as the localization of their motor points related to the IT. These research was performed on 28 lower limbs belonging to 14 formalized corpses of adult, all Brazilian origin, of both sexes. Corpses belong to the Human Anatomy Department of the Universidade Federal de Santa Catarina, Brazil. Initially, the distance measured was taken between the inferior part of the IT and a transversal line, which was extended between the most prominent parts of the femoral condyles (biepicondylar line, BEL) . On each one of the limbs we made a careful dissection considering muscular branches and their measurements were recorded. In all cases the nerve branches for the questioned muscle come from the tibial nerve portion of the ischiatic nerve. The most frequent number of branches found here were two, 9 cases in the right side and 11 in the left side, in other cases were found 3 branches, 2 cases in the right side and 1 in the left, finally on the one branch case, 3 were found in the right side and two in the left side. The average distance of the R1 source was of 30.5 ±10.4 mm and for R2 was 112.5 ±44.3 mm in the right side, and, 23.3 ±13,4 mm for R1 and 104,8 ± 39,9 for R2 in the left side. In the right side, the average length of R1 was 9.2 ±5.4 mm and of R2 52.4 ±29.4 mm; in the left side, this length for the R1 was 12.7 ±6.8 mm and for R2 was 50.9 ±26.6 mm. Most of the main nerve branches were subdivided, before penetrating the muscular belly up to 2, 3, 4 and still 5 secondary branches. Distances between IT and the motor points were also presented as well as their correlationships between the IT-BEL distance and also the source of the branches including their motor points. We hope these data could be used as a reference for clinical-surgical and electro stimulation procedures

Keywords : Lower limb; Semitendinous muscle; Ischiatic nerve; Motor points.

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