Semitendinosus muscle
| Semitendinosus muscle | |
|---|---|
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| Muscles of the gluteal and posterior femoral regions. Semitendinosus labeled at bottom left. | |
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| Semitendinosus visible at bottom left. | |
| Latin | Musculus semitendinosus |
| Gray's | p.479 |
| Origin | Tuberosity of the ischium |
| Insertion | Pes anserinus (tibia) |
| Artery | Inferior gluteal artery, perforating arteries |
| Nerve | Sciatic (tibial, L5, S1, S2) |
| Actions | Flexion of knee, extension of the hip joint |
| Antagonist | Quadriceps muscle |
The semitendinosus (/ˌsɛmitɛndɨˈnoʊsəs/) is a muscle in the back of the thigh; it is one of the hamstrings.
Structure
The semitendinosus, remarkable for the great length of its tendon of insertion, is situated at the posterior and medial aspect of the thigh.
It arises from the lower and medial impression on the tuberosity of the ischium, by a tendon common to it and the long head of the biceps femoris; it also arises from an aponeurosis which connects the adjacent surfaces of the two muscles to the extent of about 7.5 cm. from their origin.
The muscle is fusiform and ends a little below the middle of the thigh in a long round tendon which lies along the medial side of the popliteal fossa; it then curves around the medial condyle of the tibia and passes over the medial collateral ligament of the knee-joint, from which it is separated by a bursa, and is inserted into the upper part of the medial surface of the body of the tibia, nearly as far forward as its anterior crest.
The semitendinosus is more superficial than the semimembranosus (with which it shares very close insertion and attachment points). However, because the semimembranosus is wider and flatter than the semitendinosus, it is still possible to palpate the semimembranosus directly.
At its insertion it gives off from its lower border a prolongation to the deep fascia of the leg and lies behind the tendon of the sartorius, and below that of the gracilis, to which it is united. These three tendons form what is known as the pes anserinus, so named because it looks like the foot of a goose.
A tendinous intersection is usually observed about the middle of the muscle.
Innervation
A lower motor neuron exits to the sacral plexus exiting through the spinal levels L5-S2. From the sacral plexus, the lower motor neuron travels down the sciatic nerve.[1] The sciatic nerve branches into the deep fibular nerve and the tibial nerve. The tibial nerve innervates the semitendinosus as well as the other hamstring muscles, the semimembranosus and biceps femoris.[2]
Actions
The semitendinosus helps to extend (straighten) the hip joint and flex (bend) the knee joint. It also helps medially rotate the tibia on the femur when the knee is flexed and medially rotate the femur when the hip is extended. It counteracts forward bending at the hips as well.[1]
Additional images
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Right hip bone. External surface.
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The popliteal, posterior tibial, and peroneal arteries.
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Back of left lower extremity.
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Semitendinosus muscle
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Semitendinosus muscle
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Semitendinosus muscle
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Muscles of thigt. Lateral view.
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Muscles of thigt. Cross section.
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Muscles of Thigh. Anterior views.
See also
References
This article incorporates text from a public domain edition of Gray's Anatomy.
External links
- LUC semt
- 14:st-0410 at the SUNY Downstate Medical Center
- Cross section at UV pembody/body18b
- knee/surface/surface4 at the Dartmouth Medical School's Department of Anatomy
- PTCentral
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