MEDICAL PHYSIOLOGY

Detailed explanation-1: -The sacral plexus (plexus sacralis) is a nerve plexus that provides motor and sensory nerves for the posterior thigh, most of the lower leg, the entire foot, and part of the pelvis (see the following image).

Detailed explanation-2: -Brachial plexus The plexus extends toward the armpit. The ventral rami of C5 and C6 form upper trunk, the ventral ramus of C7 forms the middle trunk, and the ventral rami of C8 and T1 join to form the lower trunk of the brachial plexus.

Detailed explanation-3: -The lumbosacral trunk consists of the entire anterior segment of the fourth and fifth lumbar nerves. These nerve fibers run on the medial side of the psoas major muscle and run inferiorly over the pelvic brim to join the first sacral nerve. The lumbosacral trunk gives rise to the following nerves: Sciatic nerve.

Detailed explanation-4: -The sacral plexus is a network of nerves formed by the lumbosacral trunk (L4, L5) and sacral spinal nerves (S1-S4). The sacral plexus is located on the posterior pelvic wall, posterior to the internal iliac vessels and ureter, and anterior to the piriformis muscle.