Lateral femoral cutaneous nerve is coloured orange
Pure sensory nerve arising from the lumbar plexus. As the name suggests, it provides sensory innervation to the skin overlying the lateral thigh, both anteriorly and posteriorly.
Compression of the nerve as emerges from under the inguinal ligament can cause numbness in the distribution of the nerve, a condition called meralgia paraesthetica.
It is derived from the anterior rami of L2 and L3. It emerges from the lateral edge of the psoas major, goes across iliacus towards the anterior superior iliac spine. It passes posterior to the lateral edge of the inguinal ligament to enter the thigh.