NEET PG DENTAL EXAM

Detailed explanation-1: -The most important motor branch of the cervical plexus is the phrenic nerve. The plexus also provides motor fibers to the spinal accessory nerve and to the paravertebral and deep muscles of the neck. Each nerve, with the exception of the first cervical nerve, provides significant cutaneous sensory innervation.

Detailed explanation-2: -The phrenic nerve is derived from the cervical plexus and receives innervation from the C3, C4, and C5 nerve roots. It is the longest branch of the cervical plexus.

Detailed explanation-3: -The phrenic nerves provide motor innervation to the diaphragm and work in conjunction with secondary respiratory muscles (trapezius, pectoralis major, pectoralis minor, sternocleidomastoid, and intercostals) to allow respiration.