NEET PG DENTAL EXAM

Detailed explanation-1: -Origin. The phrenic nerve originates mainly from the 4th cervical nerve, but also receives contributions from the 3rd and 5th cervical nerves (C3-C5) in humans. Thus, the phrenic nerve receives innervation from parts of both the cervical plexus and the brachial plexus of nerves.

Detailed explanation-2: -The phrenic nerve contains motor, sensory, and sympathetic nerve fibres. It provides the sole motor supply to the diaphragm as well as sensation to its central part. In the thorax, the phrenic nerve innervates the mediastinal pleura and pericardium of the heart.

Detailed explanation-3: -Its branches consist of a superficial and deep set. The superficial branches are the great auricular nerve, lesser occipital nerve, transverse cervical, suprasternal, and supraclavicular nerves. The deep branches are the phrenic, communicantes cervicales, communicating, and muscular.

Detailed explanation-4: -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.