Which of the following muscles is innervated by the Femoral n.?

Question

BlackTom AI · Accepted Answer

To determine which muscle is innervated by the femoral nerve, we need to recall the primary nerve supplies of the anterior thigh and nearby regions.
Option 1: Sartorius m. — This muscle is a classic femoral nerve recipient, receiving innervation from the posterior divisions of the L2-L4 fibers of the femoral nerve. Its role as a hip flexor, knee flexor, and abductor of the thigh aligns with femoral nerve supply.
Option 2: Gracilis m. — Gracilis is primarily innervated by the obturator nerve (L2-L4). This makes it incorrect when identifying a femoral nerve–innervated muscle.
Option 3: Psoas major m. — The psoas major is mainly innervated by direct branches from ventral rami of L1-L3 (and sometimes L2), not by the femoral nerve itself. While the femoral nerve contributes as a continuation downstream, the primary innervation is not via the femoral nerve proper.
Option 4: Semimembranosus m. — This muscle is part of the hamstrings group and is innervated by the tibial portion of the sciatic nerve, not the femoral nerve. Therefore it does not fit.
Option 5: Semitendinosus m. — Similar to semimembranosus, the semitendinosus is innervated by the tibial part of the sciatic nerve, not the femoral nerve, making it incorrect.
In summary, the only muscle among the choices that receives its main innervation from the femoral nerve is the Sartorius m., while the rest are supplied by either the obturator nerve, direct lumbar branches, or the sciatic nerve.

Which of the following muscles is innervated by the Femoral n.?单项选择题

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