GENERAL HISTOLOGY

Detailed explanation-1: -Spinal nerves of the thoracic region, T2 through T11, are not part of the plexuses but rather emerge and give rise to the intercostal nerves found between the ribs, which articulate with the vertebrae surrounding the spinal nerve. Figure 13.3.

Detailed explanation-2: -Because the lumbar and sacral plexuses are interconnected, they are sometimes referred to as the lumbosacral plexus. The spinal nerves in the chest do not join a plexus. They are the intercostal nerves, which are located between the ribs.

Detailed explanation-3: -There are two major nerve plexuses: the brachial and lumbosacral plexus. The brachial plexus emerges from the cervical spine and the lumbosacral plexus emerges from the lumbosacral spine.

Detailed explanation-4: -The answer is (c); choroid plexus. The choroid plexus is a network of cells found in the central nervous system that aids in the production of cerebrospinal fluid (commonly known as CSF). The cervical, brachial, lumbar, and sacral plexuses are all networks of mixed spinal nerves.

Detailed explanation-5: -Brachial plexus: Cervical (C5–C8) and thoracic (T1) nerves comprise the brachial plexus, which is a nerve plexus that provides sensory and motor function to the shoulders and upper limbs.