Tensor fasciae suralis
The tensor fasciae suralis muscle is an uncommon accessory muscle in the popliteal region. It can be an unusual cause of a popliteal soft-tissue swelling or mass.
- origin: may arise from the distal aspect of any of the hamstring muscles, in the majority of reported cases it originates from the distal semitendinosus muscle.
- insertion: may insert into the posterior fascia of the leg, into the medial head of the gastrocnemius, or via a long thin tendon onto the superficial aspect of the Achilles tendon
- innervation: the tibial nerve
A tensor fasciae suralis is located superficially in the popliteal fossa, between the semitendinosus and semimembranosus muscles medially and the biceps femoris muscle laterally.
A tensor fasciae suralis can usually be identified with ultrasound or MRI, which delineate an accessory muscle in the popliteal fossa, lateral to the semitendinosus tendon and posterior to the semimembranosus.
A muscle similar in location but arising from the semimembranosus has also been described (accessory semimembranosus),
History and etymology
According to some reports, it is thought to have been first described by R A Bergman et al in 1873 3.
- 1. Sookur PA, Naraghi AM, Bleakney RR, Jalan R, Chan O, White LM. Accessory muscles: anatomy, symptoms, and radiologic evaluation. Radiographics : a review publication of the Radiological Society of North America, Inc. 28 (2): 481-99. doi:10.1148/rg.282075064 - Pubmed
- 2. Barry D, Bothroyd JS. Tensor Fasciae Suralis. Journal of anatomy. 58 (Pt 4): 382-3. Pubmed
- 3. Chason DP, Schultz SM, Fleckenstein JL. Tensor fasciae suralis: depiction on MR images. AJR. American journal of roentgenology. 165 (5): 1220-1. doi:10.2214/ajr.165.5.7572507 - Pubmed
- 4. Montet X, Sandoz A, Mauget D, Martinoli C, Bianchi S. Sonographic and MRI appearance of tensor fasciae suralis muscle, an uncommon cause of popliteal swelling. Skeletal radiology. 31 (9): 536-8. doi:10.1007/s00256-002-0496-x - Pubmed