Which of the following muscles has dual innervation by the obturator nerve and femoral nerve?

Question

BlackTom AI · Accepted Answer

Question restatement: Which of the following muscles has dual innervation by the obturator nerve and femoral nerve? Answer options: Gracilis muscle; Sartorius muscle; Adductor longus muscle; Pectineus muscle; Iliopsoas muscle.

Option 1 — Gracilis muscle: Gracilis is primarily innervated by the obturator nerve. It does not receive dual innervation from the femoral nerve, so this option is inconsistent with a dual innervation pattern.

Option 2 — Sartorius muscle: Sartorius receives innervation from the femoral nerve. There is no documented dual input from the obturator nerve for this muscle, so this choice does not fit the criterion of dual innervation.

Option 3 — Adductor longus muscle: Adductor longus is mainly supplied by the obturator nerve (anterior branch). It lacks a significant dual contribution from the femoral nerve, making this option incorrect for dual innervation.

Option 4 — Pectineus muscle: The pectineus is classically described as having dual innervation from both the obturator nerve (anterior division) and the femoral nerve. This dual supply aligns with the requirement stated in the question.

Option 5 — Iliopsoas muscle: Iliopsoas (psoas major and sometimes iliacus considered together) is predominantly innervated by branches of the lumbar plexus, notably the femoral nerve for the psoas major portion. It is not typically innervated by the obturator nerve, so it does not have dual innervation from both nerves.

Summary of reasoning: The question asks for a muscle with dual innervation from obturator and femoral nerves. Among the listed muscles, only the pectineus is classically described as receiving innervation from both nerves, whereas the others are supplied by a single nerve (primarily obturator or femoral) without a consistent dual input. The key misconception to guard against is attributing dual innervation to muscles that are purely supplied by one nerve, as that would ignore established anatomical patterns and could lead to incorrect conclusions about motor testing or surgical approaches.

Which of the following muscles has dual innervation by the obturator nerve and femoral nerve?单项选择题

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