Lumbar Plexus Practice Test 2026 – Complete Exam Prep

Plant interossei are intrinsic sole muscles that adduct the toes toward the second toe and help with toe flexion at the metatarsophalangeal joints. They are innervated by the lateral plantar nerve, a branch of the tibial nerve that supplies most of the intrinsic plantar muscles, much like the ulnar nerve does for many hand interossei. The medial plantar nerve supplies the medial group of plantar muscles (such as abductor hallucis and flexor digitorum brevis) rather than the interossei. The deep fibular nerve mainly innervates dorsum muscles of the foot and the skin between the first and second toes, not the plantar interossei. While the tibial nerve gives rise to the plantar nerves, the specific motor supply to the plantar interossei is the lateral plantar nerve.