What is the innervation of the flexor digitorum brevis muscle?

Question

BlackTom AI · Accepted Answer

To determine the innervation of the flexor digitorum brevis, we start by recalling the anatomical layout of the foot's intrinsic muscles and their nerve supply. 
Option 1: Lateral plantar nerve. While this nerve supplies many of the intrinsic muscles of the sole, including most interossei and some lumbricals, the flexor digitorum brevis is primarily supplied by the medial branch, making this option unlikely as the primary innervation. 
Option 2: Superficial fibular (peroneal) nerve. This nerve provides cutaneous innervation to parts of the dorsum of the foot and motor to some of the muscles in the anterior compartment of the leg and a few intrinsic foot muscles, but not the flexor digitorum brevis. Therefore, this is not correct. 
Option 3: Deep fibular (peroneal) nerve. The deep fibular nerve mainly innervates the anterior compartment of the leg and the dorsum of the foot between the first and second toes; it does not innervate the flexor digitorum brevis, so this is incorrect. 
Option 4: Tibial nerve. The tibial nerve gives rise to the plantar nerves, but the implant of the correct muscular innervation for the flexor digitorum brevis is via its muscular branches, not directly via the main tibial nerve; however, in the context of the choices, this is not the specific innervation for this muscle. 
Option 5: Medial plantar nerve. The medial plantar nerve, a terminal branch of the tibial nerve, supplies most of the plantar intrinsic muscles including the flexor digitorum brevis. This is the nerve distribution that matches the muscle in question. 
Putting it together, the only option that aligns with the established innervation pattern for flexor digitorum brevis is the medial plantar nerve, making it the correct choice. 
In sum, the flexor digitorum brevis is innervated by the medial plantar nerve, whereas the other nerves listed do not provide the primary innervation to this specific muscle.

ANATOMY 2300 AU2025 (34636) Practice Quiz for Unit Exams- Requires Respondus LockDown Browser

What is the innervation of the flexor digitorum brevis muscle?

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