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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

OLAVE, E; GALAZ, C; RETAMAL, P  and  CRUZAT, C. Innervation of the Fibularis Longus and Brevis Muscles in Chilean Individuals: Anatomic and Biometric Study. Int. J. Morphol. [online]. 2010, vol.28, n.4, pp.1295-1300. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022010000400049.

The innervation of the muscles of the lateral compartment of the leg is known from a general point of view and its dependence of the superficial fibular nerve (SFN) is described in the majority of the classic texts. Nevertheless, there is little information regarding detail of the number of nervous branches that muscles receive, or the location of its motor points, principally in our population. The objective of this study was to contribute to anatomic knowledge of the mentioned variables and determine the origin levels of muscular branches and the motor points location in the fibularis longus and fibularis brevis muscles. We carried out an anatomical and biometric study in 16 cadaveric legs fixed in formaldehyde of adult, Chilean individuals. Dissections were made, identifying in the proximal part of the leg the common fibular nerve (CFN) and its division point in superficial (SFN) and deep (DFN) fibularis nerves, locating the primary branches (R1, R2, R3 or more) directed for the muscles in the study.To determine the origin level of muscular branches and motor point, we identified the most prominent part of the lateral epicondyle of femur, from which the distance was recorded between this point of reference and the mentioned variables. When there were subdivisions in secondary branches (SB), also we recorded its point of origin and motor point in the muscular belly. In the fibularis longus muscle we observed R1 and R2 in 16 cases; R1, R2 and R3 in 13 cases; R1, R2, R3 and R4 in 5 cases and 5R in one case. The R1 originated from the CFN in 6 cases (37.5 %), from the SFN in 9 (56.3 %) and from the medial dorsal cutaneous nerve (SFN precocious division) in 1 (6.3 %); The R2 originated in the CFN in 2 cases (12.5 %), of the SFN in 13 (81.3 %) and of the medial dorsal cutaneous nerve in 1 (6.3 %); the R3 was emitted by the SFN in 11 cases and by the intermediate dorsal cutaneous nerve (SFN precocious division) in 2. The primary branches were subdivided even in 5 SB. The fibularis brevis muscle presented R1 in 8 cases; R1 and R2 in 5 cases; R1, R2 and R3 in one case and 4R in 2 cases. The R1 was observed in 11 cases (75 %) coming from the SFN and in 4 cases (18.8 %) originated from the accessory deep fibular nerve; the R2 was emitted by the SFN in 4 cases (50 %) and by the accessory deep fibular nerve in 4 (50 %); the R3 originated in the accessory deep fibular nerve in 3 cases. In various cases, the primary branches were divided even in 5 SB. The levels where the nervous branches penetrate in the muscular belly are shown in tables. These findings will complement the knowledge of the muscle innervation of the lateral compartment of the leg.

Keywords : Anatomy; Innervation; Motor points; Fibular longus and fibular brevis muscles.

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