Which peripheral nerve innervates the hamstring muscle group.

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Question restatement: Which peripheral nerve innervates the hamstring muscle group.
Option 1: obturator — The obturator nerve primarily supplies the medial thigh muscles (medial compartment adductors) and does not innervate the hamstring muscle group. This makes it an unlikely choice for the hamstrings.
Option 2: sciatic — The sciatic nerve is the major nerve supplying the posterior thigh, i.e., the hamstring group (biceps femoris, semitendinosus, semimembranosus). Branches within the posterior thigh ultimately come from the sciatic nerve, making this the correct and most comprehensive answer for the entire hamstring group.
Option 3: common fibular — Also called the common peroneal nerve, this is a division of the sciatic nerve that mainly supplies muscles in the anterior and lateral compartments of the leg and the short head of the biceps femoris (one hamstring component). It does not comprehensively innervate the entire hamstring group, so choosing it would overlook its partial contribution.
Option 4: femoral — The femoral nerve innervates the anterior thigh muscles (notably the quadriceps) and does not supply the hamstrings, making this option incorrect.
Summary of reasoning: The hamstring group spans multiple muscles in the posterior thigh, and their collective innervation traces to the sciatic nerve. While the common fibular division contributes to one component (the short head of the biceps femoris), it does not account for the entire hamstring group, and the other nerves (obturator, femoral) do not innervate the hamstrings. Therefore, the sciatic nerve is the appropriate nerve for the hamstring muscle group.

Anatomy and Physiology Systems I (1016MSC_NA_3251) EOT Practice Exam (ONLINE)

Which peripheral nerve innervates the hamstring muscle group.

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