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PHRENIC NERVE

Anatomy-Thorax

PHRENIC NERVE

ORIGIN
1. Carries fibers from INSPIRATORY CENTRE - nucleus of the tractus solitarius in the dorsum of the medulla.
2. From C3, 4, 5 nerve roots.

COURSE
2. Neck - Runs over the SCALENUS ANTERIOR.

3. Mediastinum - in contact with the mediastinal pleura throughout its course. Runs anterior to the lung root.
- Right phrenic passes lateral to venous structures (right BCV, SVC, right atrium, IVC) and passes through the vena caval foramen.
- Left phrenic passes lateral to the CCA, crosses the arch of aorta (anterior to vagus), runs lateral to pericardium (left atrium, apex of heart) and pierces the muscular part of left hemidiaphragm.

SUPPLY
4. Under the diaphragm each nerve terminates into anterior, posterior, lateral branches to supply its hemidiaphragm.

BLOOD SUPPLY TO NERVE
5. Derived from accompanying pericardiocophrenic artery.


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REFERENCES

1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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