What does the lumbar plexus innervate?
A. Diaphragm
B. Medial leg and foot
C. Posterior thigh
D. None of the above
ANS: B
Rationale: The lumbar plexus is formed by the anterior rami of L1-L4; the plexus forms in the psoas major muscle. Branches of the lumbar plexus innervate skin and muscles of the anterior and medial thigh. A cutaneous branch from the plexus, the saphenous nerve, continues into the leg to innervate the medial leg and foot. Branches of the cervical, brachial, and lumbar plexuses provide sympathetic innervation via connections with the sympathetic chain.
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