Semitendinosus muscle
| Semitendinosus muscle |
|---|
|
| Upper thigh muscles of man |
| origin |
| Ischial tuberosity ( tuber ischiadicum ) of the hip bone |
| approach |
| Upper, inner surface of the tibia ( Pes anserinus superficialis ) |
| function |
| Extension and adduction in the hip joint, flexion and internal rotation in the knee joint |
| Innervation |
| Tibial nerve |
| Spinal segments |
| L5-S2 |
The semitendinosus muscle ( Latin for "hemisphere muscle") is one of the back skeletal muscles of the thigh . Occasionally, an oblique intermediate tendon divides the muscle belly.
function
The semitendinosus muscle stretches the hip joint . In addition, like all muscles of the so-called ischiocrural muscles (these include the semitendinosus, the biceps femoris and semimembranosus muscles ), it flexes the knee joint . Unlike the biceps femoris muscle, it turns the leg inwards. In the case of non-guided movements, a corresponding coordination of all three muscles is required if the lower leg is to be held in the sagittal plane during flexion , i.e. H. should not fall into a simultaneous external or internal rotation.
The involvement of the semitendinosus muscle (and the other two muscles of the ischiocrural muscles , the biceps femoris, caput longum and semimembranosus ) in stretching the knee joint is known in humans as the Lombard paradox .
The semitendinosus muscle in animals
In slaughtered animals, the muscle is part of the lower shell .
Individual evidence
- ^ JJ Andrews: The functional roles of the hamstrings and quadriceps during cycling: Lombard's Paradox revisited . In: J Biomech . tape 20 , no. 6 , 1987, pp. 565-575 , doi : 10.1016 / 0021-9290 (87) 90278-8 , PMID 3611133 .