Anatomy and Cell Biology 3319 Lecture : Anatomy Notes
1 May 2012
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The lumbar plexus: the lumbar plexus arises from the first 4 lumbar spinal nerve l1-l4. It is located within the psoas major muscle. Some of its minor branches innervate the abdominal wall, but its main branches descend to innervate the anterior thigh via the femoral and obturator nerves. The nerves from the lumbar plexus innervate the muscles in the anterior and medial compartments of the thigh, and supply cutaneous innervation to anterior and medial portions of the thigh and leg. The obturator nerve passes through the obturator foramen of the pelvis and it comes off the anterior division of the plexus. The femoral nerve runs deep to the inguinal ligament to enter the thigh and it comes off the posterior division of the plexus. The sacral plexus: the sacral plexus originates from spinal nerves l4-s4 and is found directly behind the lumbar plexus. Lumbar plexus: femoral nerve anterior compartment of thigh muscles. Obturator nerve medial compartment of thigh muscles.
