Also found in: Encyclopedia.


Composed in part of tendon; denoting the semitendinosus muscle.
Synonym(s): semitendinosus
[L. semitendinosus]


Etymology: L, semi + tendere, to stretch
one of three posterior femoral muscles of the thigh, remarkable for the great length of the tendon of insertion. It is a fusiform muscle located in the posterior and medial part of the thigh, arising from the tuberosity of the ischium. It ends just distal to the middle of the thigh in a long round tendon that crosses the semimembranosus and curves around the medial condyle of the tibia and inserts into the medial surface of the tibia. It functions to flex the leg, to rotate it medially after flexion, and to extend the thigh. Compare biceps femoris, hamstring muscle, semimembranosus.
enlarge picture


(sĕm″ē-tĕn″dĭn-ō′sŭs) [L.]
The fusiform muscle of the posterior and inner part of the thigh.


posterior thigh muscle
  • origin medial ischial tuberosity (with long head of biceps femoris)

  • insertion upper part of medial surface of tibia inferior to knee joint, posterior to tendons of gracilis and sartorius

  • nerve supply tibial nerve

  • action as semimembranosus

References in periodicals archive ?
The hair on hind legs was removed and the skin of the hind legs sterilized with 75% ethanol, then the whole semitendinosus (ST) and semimembranosus (SM) muscles on the right and left were dissected using scalpels, respectively.
Use of a semitendinosus tendon autogenous graft for rupture of the patellar ligament after total knee arthroplasty.
She underwent arthroscopically assisted ACL reconstruction using semitendinosus and gracillis autograft within 2 weeks of her injury.
Gluteal bolge duzeyinde siyatik sinir yaralanmalarinda, semitendinosus, semimembranosus ve biseps femoris (kisa ve uzun baslari) ile tibial ve peroneal sinir innervasyonlu kaslarda bulgulara rastlanir.
WNV in tissues from solid organ donor associated with WNV transmission to solid organ transplant recipients * Tests performed ([dagger]) Cell IHC Specimens tested RT-PCR culture staining Spleen/lymph node homogenate + + NT Tissues Skin + - - Fat, tibia + - - Tendon Gracilis + - NT Achilles - NT NT Semitendinosus - NT NT Tibialis - NT NT Muscle Attached to tibia + - - Adjacent to gracilis tendon - - NT Bone marrow Femur + - - Pelvis - NT NT Bone, pelvic cortical NT NT * WNV, West Nile virus; RT-PCR, reverse transcription PCR; IHC, immunohistochemical; +, positive; NT, not tested; -, negative.
The electromyography (EMG) activity of the muscles of the right leg, including the tibialis anterior (TA), medial gastrocnemius (MG), soleus (SO), vastus medialis (VM), rectus femoris (RF), and semitendinosus (SM), were also recorded.
E stato posizionato un elettrogoniometro a livello sia dell'articolazione del ginocchio che dell'articolazione dell'anca e i sensori dell'elettromiografia (EMG) di superficie in 8 muscoli dell'arto inferiore (biceps femori, gluteus maximus, madial gastrocnemi, rectus femoris, semitendinosus, soleus, tibialis anterior e vastus medialis).
The specific purpose was to observe for EMG analysis if the rectus femoris, vastus lateralis and medialis, biceps femoris, semitendinosus and brachial biceps muscles have different patterns when submitted to weights of 2, 4, 6, and 8 kgs.
A periconceptional nutrient restriction (~50%) decreased total myofibre number in the foetal semitendinosus muscle (37).
Ao desmame com 60 dias de idade (por biopsia) e ao abate, foram retirados fragmentos da porcao mediana superficial com 1 cm de profundidade do musculo Semitendinosus esquerdo das cordeiras, para mensuracao do diametro e da frequencia dos tipos de fibras.
The MRI showed a mild strain in the semitendinosus muscle.
The hamstrings consist of three less bulky muscles: the biceps femoris and, deeper underneath, semimembranosus and semitendinosus.