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International Journal of Morphology

On-line version ISSN 0717-9502


OLAVE, Enrique. Innervation of the Semimembronosus Muscle. Int. J. Morphol. [online]. 2005, vol.23, n.4, pp.363-368. ISSN 0717-9502.

Classical Anatomy books describe muscle innervation in a very general way. As an example biometric location of muscular branches and their respective motor points are not quite clear. Therefore, it is necessary to know their exact position when therapies such as electric stimulation or injection of neurolytic substances are applied. On this purpose to shed some light on these matters, it was studied the semimembranosus muscle innervation on 28 lower limbs specimens of 14 formalyzed cadavers from adult male of Brazilian origin. In order to obtain their biometric records, the landmark points employed here were arranged from the distal part of the ischiatic tuberosity (IT) followed by an imaginary transversal line deployed over the most prominent parts of the femoral epicondyles. On 18 cases it was observed only one innervation branch, coming from the tibial portion of the ischiatic nerve directed to the semimembranosus muscle and in the remaining 10 cases it was observed that two branches were received by the semimembranosus muscle. In 60,7% of cases the branch originated from a common trunk together at the magnus adductor muscle branch. In the group with one branch, the average distance from the R1 origin respect to IT was 121,8 mm ± 24,6 at the right side and 124,7 mm ± 15,9 at the left side. In the group with two branches the average distance at the right side for both R1 was 125,5 mm + 28,0 and for R2 123,7 mm ± 29,2. At the left side both distances were 111,5 mm ± 28,2 for R1 and 149,4 mm ± 36,8 for R2. In the one branch group at the right side the R1average length gave a value of 38,7 mm ± 26,6 instead for the left side gave a value of 28,3 mm ± 23,1. The R1 and R2 were distributed in 2,3 and more secondary branches regarding the motor points location. Finally, I hope with these findings to contribute at the innervation knowledge and the motor point areas from thigh muscles

Keywords : Anatomy; Innervation; Semimembranosus muscle; Motor points.

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