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ABDOMINAL NERVES – VENTRAL VIEW – DORSAL ABDOMINAL WALL – LEFT SIDE FEMORAL NERVE - The origin of the femoral nerve is from the anterior rami of L2 to L4. The femoral nerve emerges from the psoas major just before it passes deep to the inguinal ligament. It enters the thigh lateral to the femoral artery. It serves the iliacus and once in the thigh it divides and serves the pectineus as well as the muscles of the anterior compartment. It gives rise to the saphenous nerve. It also has sensory function to the skin of the anterior surface of the thigh and via the saphenous nerve to the medial surface of the leg. In the cat the femoral nerve is about the size of a number 9 vermicelli. GENITOFEMORAL NERVE - The genitofemoral nerve is usually found adjacent to the external iliac artery in the cat. It bifurcates into a genital branch and a femoral branch. The genital branch in men innervates the cremaster muscle and some fibers continue on the the superior skin of the scrotum. In females the fibers travel with the round ligament of the uterus to the inguinal canal and then on to the labium majus and skin of mons pubis. The femoral branch passes into the femoral sheath and then innervates the skin on the anterior proximal portion of the thigh. Because of this, it is sometimes affectionately known to Dr. J's anatomy students as the "heebeegeebee nerve" because when someone rubs the proximal portion of the thigh, the person experiences the heebeegeebees. It is recommended that you inform a person that you are going to do this before performing the experiment, otherwise you may end up on the late news! LATERAL BRANCH MEDIAL BRANCH LATERAL CUTANEOUS NERVE - The lateral cutaneous nerve is usually found close to the deep iliac circumflex artery on the surface of psoas major. Usually it is the diameter of dental floss in the cat. It passes through the internal and external abdominal oblique muscles and innervates the posterolateral gluteal skin. LUMBAR NERVE - The medial and lateral lumbar nerves are branches of the ventral rami of the third lumbar nerve. They can be found dorsal to the kidney and lateral to the psoas major muscle.