GROSS ANATOMY

Detailed explanation-1: -The brachial plexus (plexus brachialis) is a somatic nerve plexus formed by intercommunications among the ventral rami (roots) of the lower 4 cervical nerves (C5-C8) and the first thoracic nerve (T1).

Detailed explanation-2: -Ventral rami of the C5 through T1 spinal nerves constitute the roots of the brachial plexus. They come together to give rise to three trunks: superior (C5-C6), middle (C7), and inferior (C8-T1). These trunks subsequently divide into six divisions, located anteriorly and posteriorly.

Detailed explanation-3: -The brachial plexus is formed by the anterior primary rami of C5 through T1 and provides sensory and motor innervation of the upper extremity. The brachial plexus is divided, proximally to distally into rami/roots, trunks, divisions, cords, and terminal branches.

Detailed explanation-4: -The brachial plexus is a network of nerves (nerve plexus) formed by the anterior rami of the lower four cervical nerves and first thoracic nerve (C5, C6, C7, C8, and T1).

Detailed explanation-5: -The lateral pectoral nerves arise from the lateral cord of brachial plexus and carry fibers of C5, C6 and C7 spinal nerves.