This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

Phrenic nerve (anatomy)

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

The phrenic nerves provide the major nerve supply to the diaphragm because of their embryonic association with the septum transversum that goes on to form the central tendinous part of the diaphragm.

Also, it supplies a large percentage of the median structures of the mediastinum i.e. it is sensory for:

  • pleura:
    • mediastinal
    • central parts of diaphragmatic
  • pericardium:
    • fibrous
    • superficial serous pericardium
  • abdominal components e.g.:
    • superior peritoneum
    • liver
    • gallbladder

Each phrenic nerve contributes predominantly motor fibres solely to its hemidiaphragm. Damage to the phrenic nerve may lead to paralysis of one hemidiaphragm. It has a few sensory fibres which supply all but the peripheral attachments of the muscle. Irritation of the phrenic sensory fibres tends to refer pain to the C4 dermatome territory.

The passage taken by the right and left phrenic nerves through the thorax is different. This is largely due to the disposition of great vessels within the mediastinum.

Occasionally, the phrenic nerve may be joined by an accessory phrenic nerve.


Related pages

Create an account to add page annotations

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.