Anatomy Atlases: Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System: Alphabetical Listing of Muscles: S: Semitendinosus

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Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System: Alphabetical Listing of Muscles: S

Semitendinosus

Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed

Complete separation of semitendinosus from biceps femoris has been noted and this is of interest because the two muscles are independent in certain groups of mammals. Semitendinosus may be partially fused with semimembranosus and cases have been reported of muscular slips joining biceps femoris and semitendinosus. Accessory slips have been observed arising from the coccyx, sacrotuberous ligament, or ischial tuberosity and joining the belly of semitendinosus. In 39% of 62 limbs, the semitendinosus took origin from the sacrotuberous ligament.

A rare variation is one in which a slip arises from the linea aspera below the semitendinosus and ends on the media epicondyle and back of the knee joint.

Tensor fasciae suralis or ischioaponeuroticus is a slip that leaves the belly of the semitendinosus (it may also be one of the other hamstrings) and ends in a tendon that joins the fascia of the leg.

Syn.: m. seminervosus, Halbsehniger or halbflechsiger Muskel, Demi-tendineux.

Reference
Anson, B.J., Ed. (1966) Morris' Human Anatomy, 12th ed., The Blakiston Division, McGraw-Hill Book Company. New York.

Gray, D.J. (1945) Some anomalous hamstring muscles. Anat. Rec. 91:33-38. vGruber, W. (1872) Sur un muscle tenseur de l'aponeurose surale partant du demitendineux. Bull. l'Acad. Imp. Sci. St. Petersbourg 17:289-201.

Gruber, W. (1873) Sur une variante du muscle tenseur de l'aponeurose surale, partant du muscle demi-tendineaux. Bull. l'Acad. Imp. Sci. St. Petersbourg 18:184-186.

Gruber. W. Wahrer Musculus semitendinosus biceps. Arch. Path. Anat. Physiol. Klin. Med. 103:477-479.

Macalister, A. (1875) Observations on the muscular anomalies in the human anatomy. Third series with a catalog of the principal muscular variations hitherto described. Trans. Roy. Irish Acad. Sci. 25:1-130.

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