Phrenic Nerve Anatomy

The phrenic nerve can be marked by a line connecting these two points. Understanding the anatomy of the phrenic nerves is essential for surgeons.

Instant Anatomy Diagram

Descends anteriorly along the right lung root.

Phrenic nerve anatomy. 1st point can be labelled 35 cm at the level of the thyroid cartilage from the midsagittal plane. It crosses the arch lateral to the superior intercostal vein and in front of the vagus nerve and then runs laterally down the pericardium over the left ventricle towards the apex of the heart. The left phrenic nerve runs laterally to the aortic arch and initial parts of the left subclavian artery and the left common carotid artery.

Courses along the pericardium of the right atrium of the heart. Then the phrenic nerves go down. It provides complete motor innervation to the diaphragm and sensation to the central tendon aspect of the diaphragm.

At the level of the mediastinum the phrenic nerve is found alongside the anterior scalene muscle shielded in the fibrous connective tissue that surrounds the vascular structures of the neck more commonly known as the carotid sheath. The phrenic nerve is a mixed motorsensory nerve that courses through the neck and thorax to innervate the diaphragm. Conditions associated with phrenic nerve function or dysfunction can range.

Phrenic nerve anatomy definition phrenic nerve arises in neck region from the anterior rami of the 3rd 4th and 5th cervical spinal nerves. The phrenic nerve has sensory motor and sympathetic functions. From there the two phrenic nerves follow different directions one more.

The left phrenic nerve has the left common carotid and left subclavian arteries that arise from the arch of the aorta to its medial side. 2nd point is at the medial end of the clavicle. In the upper chest the right phrenic nerve lies lateral to the right brachiocephalic vein and the superior vena cava.

Pierces the diaphragm at the inferior. The anatomy of the phrenic nerve anatomy. Right phrenic nerve passes anteriorly over the lateral part of the right subclavian artery.

Dr yuranga weerakkody and dr henry knipe et al. Enters the thorax via the superior thoracic aperture. The phrenic nerve originates from the anterior rami of the c3 through c5 nerve roots and consists of motor sensory and sympathetic nerve fibers.

Phrenic nerve roots are c3c4c5 but mainly from the fourth cervical spinal segment root and recive contribution from third and forth cervical nerves.

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