Semimembranosus muscle
| Semimembranosus muscle |
|---|
|
| Upper thigh muscles of man |
| origin |
| Ischial tuberosity ( ischial tuberosity ) |
| approach |
| Condylus medialis of the tibia in the so-called Pes anserinus profundus (Condylus medialis tibiae, Lig. Popliteum obliquum, fascia of the M. popliteus ) |
| function |
| Hip joint: extension, adduction
Knee joint: flexion, internal rotation |
| Innervation |
| Tibial nerve |
| Spinal segments |
| L5-S2 |
The semimembranosus muscle ( Latin for "semi-membranous muscle") is one of the back skeletal muscles of the thigh . It owes its name to its broad tendon of origin . Both the tendon and the muscle belly show an indentation in the upper part, in which the semitendinosus muscle runs.
In the horse , the muscle has a vertebral head, i.e. a second origin at the cross and first tail vertebrae. In dogs and cats , the muscle is divided into two bellies. In animals for slaughter, the muscle is part of the upper shell .
function
The semimembranosus muscle stretches the hip joint. He also bends the knee and turns the lower leg inward.
The involvement of the semimembranosus muscle (and the other two muscles of the ischiocrural muscles , the biceps femoris, caput longum and semitendinosus ) in stretching the knee joint is known in humans as the Lombard paradox .
See also
Individual evidence
- ^ JG 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 .