Which plexus is responsible for innervating the lower limbs?

The sacral plexus is primarily responsible for innervating the lower limbs. This network of nerves arises from the lumbosacral region of the spinal cord and contains contributions from the lumbar and sacral spinal nerves. Within this plexus, key nerves such as the sciatic nerve emerge, providing motor and sensory innervation to the majority of the lower limb, including the thigh, leg, and foot.

The lumbar plexus, while important for lower limb function, mainly innervates the lower abdomen and parts of the thigh. Additionally, the brachial plexus is focused on the upper limb's innervation, and the cervical plexus serves the head, neck, and upper shoulder areas. Thus, the sacral plexus stands out for its specific and crucial role in lower limb innervation.