Changes

'''''Semitendinosus'''''

'''''Semitendinosus'''''

:'''Innervation'''

:'''Origin'''

:'''Innervation''': Caudal gluteal n.

:'''Insertion'''

:'''Origin''':

:'''Action'''

:: Pelvic head - Ventral aspect of the ischial tuberosity

The semitendinous muscle originates from various points including; the pelvic head,  the ventral aspect of ischial tuberosity, the sacrum, 1st caudal vertebrae and the sacrotuberous ligament. The two bellies of the '''semitendinous''' then unite and run as a flat tendon to the medial side of the leg. It then partially fans out into the crural fascia and partially inserts onto the cranial aspect of the tibia. The remaining tendon joins the tarsal tendon.  

:: Vertebral head - Spinous and transverse processes of the sacrum, 1st caudal vertebrae, sacrotuberous ligament

:'''Insertion''': The reunited tendon fans out into the crural fascia and partially inserts onto the cranial aspect of the tibia. The remaining tendon joins the tarsal tendon of the ''biceps'' muscle to insert on the calcaneal tuberosity.

:'''Action''': Extends the hip, stifle and tarsus during weightbearing causing propulsion. When the limb is non-weightbearing, it flexes the stifle, rotates the leg outwards and moves it backwards.  

'''''Semimembranosus'''''

'''''Semimembranosus'''''