Which muscle is NOT correctly matched with its innervation?

Question

BlackTom AI · Accepted Answer

Let’s walk through each muscle–nerve pairing to evaluate its accuracy and catch any mismatches.
Option 1: Tensor fasciae latae m. – superior gluteal n. The tensor fasciae latae is indeed innervated by the superior gluteal nerve (L4–S1). This pairing is correct, so it supports normal innervation.
Option 2: Psoas major m. – lumbar spinal n. The psoas major receives innervation from the lumbar plexus, typically the ventral rami of L1–L3 (often summarized as lumbar spinal nerves). This is a correct match, so no issue here.
Option 3: Rectus femoris m. – femoral n. The rectus femoris, part of the quadriceps, is innervated by the femoral nerve. This is another correct pairing.
Option 4: Pectineus m. – femoral n. The pectineus has dual innervation in many sources: primarily the femoral nerve, with contributions from the obturator nerve in some individuals. Stating it is innervated by the femoral nerve is commonly accepted, though not exclusive. This is generally considered a correct match with caveats about dual innervation.
Option 5: Biceps femoris short head m. – tibial n. The biceps femoris has two heads: the long head is innervated by the tibial part of the sciatic nerve, while the short head is innervated by the common fibular (peroneal) nerve. Therefore, matching the short head to the tibial nerve is incorrect, making this the NOT correctly matched pairing among the options.
In summary, options 1–4 align with accepted innervation patterns (noting the dual innervation caveat for pectineus), whereas option 5 incorrectly assigns the short head of the biceps femoris to the tibial nerve, which is why it is the mismatched pairing.

ANATOMY 2300 SP2025 (2146) Unit 2: Muscles of the Hip and Thigh

Which muscle is NOT correctly matched with its innervation?

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