ANATOMY

Detailed explanation-1: -It is the longest cranial nerve and the only one to leave the head and neck region. The vagus nerve travels into the thoracic and abdominal cavities, providing parasympathetic supply to visceral organs.

Detailed explanation-2: -vagus nerve, also called X cranial nerve or 10th cranial nerve, longest and most complex of the cranial nerves. The vagus nerve runs from the brain through the face and thorax to the abdomen. It is a mixed nerve that contains parasympathetic fibres.

Detailed explanation-3: -The vagus nerve carries an extensive range of signals from digestive system and organs to the brain and vice versa. It is the tenth cranial nerve, extending from its origin in the brainstem through the neck and the thorax down to the abdomen.

Detailed explanation-4: -The left vagus crosses in front of the left subclavian artery to enter the thorax between the left common carotid and subclavian arteries. It descends on the left side of the aortic arch, which separates it from the left pleura, and travels behind the phrenic nerve.

Detailed explanation-5: -Functions. The vagus nerve has a very extensive distribution. Sensory: Innervates the skin of the external acoustic meatus and the internal surfaces of the laryngopharynx and larynx. Provides visceral sensation to the heart and abdominal viscera.