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Question 9#

Which of the following statements is correct?

A. The hamstring muscles include semimembranosus, semitendinosus and gracilis
B. The dominant action of biceps femoris is to flex the hip joint
C. The sciatic nerve is accessible in the angle between the lower border of gluteus maximus and the medial border of the long head of biceps femoris
D. All but one of the motor branches of the sciatic nerve arises from its medial side, making the lateral side the safest side to dissect along
E. None of the above is true

Correct Answer is D

Comment:

All but one of the motor branches of the sciatic nerve arises from its medial side, making the lateral side the safest side to dissect along. The only motor branch to arise from the lateral border of the sciatic nerve is the branch to the short head of biceps and so it is safest to dissect along the lateral side. The hamstrings are semimembranosus, semitendinosus and the long head of biceps femoris (only). They extend the hip and flex the knee. The sciatic nerve is deep in the angle between gluteus maximus and the lateral border of the long head of biceps. The short head of biceps is not considered part of the hamstrings because it does not arise from the ischium and has no action on the hip joint.