Femoral

The femoral nerve is a nerve in the thigh that supplies skin on the upper thigh and inner leg, and the muscles that extend the knee. The nerve enters Scarpa's triangle by passing beneath the inguinal ligament, just lateral to the femoral artery. In the thigh, the nerve lies in a groove between iliacus muscle and psoas major muscle, outside the femoral sheath, and lateral to the femoral artery. After a short course of about 4 cm in the thigh, the nerve is divided into anterior and posterior divisions, separated by lateral femoral circumflex artery

Since the lumbar plexus and sacral plexus are interconnected, they are sometimes referred to as the lumbosacral plexus. the intercostal nerves that give rami to the chest and to the upper parts of the abdominal wall efferent motor innervation and to the pleura and peritoneum afferent sensory innervation are the only ones that do not originate from a plexus. the ventral rami of l1-l5 spinal nerves with a contribution of t12 form lumbar plexus. this plexus lies within the psoas major muscle. nervi of the plexus serve the skin and the muscles of the lower abdominal wall, the thigh and external genitals. the largest nerve of the plexus is the femoral nerve. it supplies anterior muscles of the thigh and a part of skin distal to the inguinal ligament.