CT Anatomy Tutorials:
The Hamstring muscles

 

 

Arrows

Red=semitendinosus

Yellow=semimembranosus

Green=biceps femoris - long head

Purple=biceps femoris - short head

Text

AM=Adductor Magnus

 

 

           

Axial CT sections from the midthigh to the adductor hiatus

At and below the midthigh level, the semimembranosus reaches its largest size. The semitendinosus become progressively smaller until it becomes tendinous and moves to a position directly posterior to the semimembranosus. Laterally, the muscle bellies of the short and long heads of the biceps show reciprocal changes in size at progressively more inferior sections with the short head increasing and the long head decreasing in size.

Arrows

Red=semitendinosus

Yellow=semimembranosus

Green=biceps femoris - long head

Purple=biceps femoris - short head

 

 

        

Axial CT sections from the below the adductor hiatus to the femoral condyles

Below the adductor hiatus, the long head of the biceps femoris becomes tendinous and lies posterior to the muscle belly of the short head. The semitendinosus and semimembranosus diverge medially while the long and short heads of the biceps femoris diverge laterally to form the upper boundaries of the popliteal fossa.

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