Semitendinosus muscle
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{{Muscle infobox |
Name = Semitendinosus muscle |
Latin = musculus semitendinosus |
GraySubject = 128 |
GrayPage = 479 |
Image = Semitendinosus muscle.PNG |
Caption = Muscles of the gluteal and posterior femoral regions. Semitendinosus labeled at bottom left. |
Image2 = Gray432 color.png |
Caption2 = Semitendinosus visible at bottom left. |
Origin = [[tuberosity of the ischium]] |
Insertion = [[pes anserinus (leg)|pes anserinus]] |
Action = [[Flexion|flex]] [[knee]], [[Extension (kinesiology)|extend]] [[hip joint]] |
Antagonist = [[Quadriceps muscle]] |
Blood = [[inferior gluteal artery]], [[perforating arteries]] |
Nerve = [[sciatic nerve|sciatic]] ([[tibial nerve|tibial]], L5, S1, S2) |
MeshName = |
MeshNumber = |
DorlandsPre = m_22 |
DorlandsSuf = 12550732 |
}}
The '''semitendinosus''' is a [[muscle]] in the back of the [[thigh]]; it is one of the [[hamstring]]s.
==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 tibial 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.
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 muscle|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==
The semitendinosus is innervated by the tibial part of the [[sciatic nerve]].
==Actions==
The semitendinosus helps to [[Extension (kinesiology)|extend]] (straighten) the [[hip joint]] and [[flexion|flex]] (bend) the [[knee joint]]. It also helps [[medially rotate]] the knee.
==Additional images==
<gallery>
Image:Gray235.png|Right hip bone. External surface.
Image:Gray551.png|The popliteal, posterior tibial, and peroneal arteries.
Image:Gray1239.png|Back of left lower extremity.
</gallery>
==See also==
* [[Semimembranosus]]
* [[Biceps femoris]]
==External links==
* {{MuscleLoyola|semt}}
* {{SUNYAnatomyLabs|14|st|04|10}}
* {{ViennaCrossSection|pembody/body18b}}
* {{DartmouthAnatomy|knee/surface/surface4}}
* [http://www.ptcentral.com/muscles/musclelegs.html#semitendinosus PTCentral]
{{Gray's}}
{{Muscles_of_lower_limb}}
[[Category:Thigh muscles]]
{{muscle-stub}}
[[de:Musculus semitendinosus]]
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[[fr:Muscle semi-tendineux]]
[[he:השריר החצי גידי]]
[[hr:Polutetivni mišić]]
[[nl:Musculus semitendinosus]]
[[pl:Mięsień półścięgnisty]]
[[fi:Puolijänteinen lihas]]
[[sl:Polkitasta mišica]]