GENERAL HISTOLOGY

Detailed explanation-1: -The sacral plexus is derived from the anterior rami of spinal nerves L4, L5, S1, S2, S3, and S4. Each of these anterior rami gives rise to anterior and posterior branches. The anterior branches supply flexor muscles of the lower limb, and posterior branches supply the extensor and abductor muscles. Sacral plexus.

Detailed explanation-2: -The sciatic nerve is the terminal and largest branch of the sacral plexus formed from both anterior and posterior divisions of the anterior rami of spinal nerves L4 to S3. The nerve exits the pelvic cavity by way of the greater sciatic foramen.

Detailed explanation-3: -The lumbar plexus is a network of nerves that arises from the anterior rami of spinal nerves L1-L4, along with a contribution from the anterior ramus of spinal nerve T12.

Detailed explanation-4: -The nerve plexuses are proximal segments of peripheral nerves emerging from the foramina of the spine with interchanging and intertwining nerves from different spinal levels that then form individual nerves more distally. There are two major nerve plexuses: the brachial and lumbosacral plexus.

Detailed explanation-5: -The lumbosacral plexus is formed by the anterior rami (i.e., branches) of spinal nerves L4 to L5 and S1 to S4. It is located on the posterolateral wall of the lesser pelvis, adjacent to the lumbar spine.