Question

what areas of the body are innervated by the lumbosacral plexuses?
□ skin of the feet
□ lower abdominal wall
□ muscles in the thigh
□ skin of the arm
□ muscles in the back
□ skin of the thoracic wall

Explanation:

• The lumbosacral plexuses (lumbar and sacral plexuses) innervate the lower part of the body. The skin of the feet is innervated by nerves from the sacral plexus (e.g., tibial, common fibular nerves). Muscles in the thigh are innervated by nerves from the lumbar plexus (e.g., femoral nerve) and sacral plexus. Muscles in the back (lower back, related to the lumbosacral region) are also innervated by lumbosacral plexus nerves.
• The lower abdominal wall is innervated by the thoracic - lumbar (thoraco - lumbar) nerves (not lumbosacral plexus main innervation for this area in the typical sense). The skin of the arm is innervated by the brachial plexus. The skin of the thoracic wall is innervated by intercostal nerves (thoracic nerves), not lumbosacral plexuses.

Answer:

A. Skin of the feet, C. Muscles in the thigh, E. Muscles in the back