The lumbar plexus leads to nerves on the anterior and the medial aspect of the thigh. A large femoral nerve arises from the lumbar plexus and innervates the four muscles of the quadriceps femoris group on the anterior thigh. The obturator nerve innervates the adductor muscles of the medial thigh and the genitofemoral nerve is a sensory nerve that receives impulses from the male scrotal sac and the labia majora in females. The iliohypogastric nerve innervates the muscles of the abdomen and the skin of the belly. The ilioinguinal nerve innervates the same muscles as does the iliohypogastric nerve and it receives sensory information from the base of the penis and the scrotum in males, and from the labia majora in females. The lateral femoral cutaneous nerve receives sensory information from the skin of the lateral thigh. Label these nerves in the illustration and color them in with a different color.
Answer Key: a. T 12, b. LI, c. L2., d. L3. e. L4, f. L5, g. Iliohypogastric nerve, h. Ilioinguinal nerve, i. Lateral femoral cutaneous nerve, j. Femoral nerve, k. Genitofemoral nerve, I. Obturator nerve
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