Lumbosacral enlargement

The lumbosacral enlargement is a widened area of the spinal cord which is located in its lower part, specifically extending from the L1 to S3 spinal cord segments.

Reason for Enlargement:

The lumbosacral enlargement occurs because this region contains a dense collection of motor neurons in the ventral horn and sensory neurons in the dorsal horn, concentrated to meet the functional demands of the lower limbs. Specifically, the ventral rami of the lower lumbar and sacral spinal nerves arise from this region, collectively form the lumbosacral plexus, supplying sensory and motor innervation to the pelvis, thighs, legs, and feet.