This section is from the book "The Horse - Its Treatment In Health And Disease", by J. Wortley Axe. Also available from Amazon: The Horse. Its Treatment In Health And Disease.
The Phrenic or Diaphragmatic Nerve is formed mainly by the union of the .sixth and seventh cervical nerves, and sometimes also by a small branch of the fifth. It then enters the chest by passing between the two first ribs, and crossing the pericardium reaches the diaphragm, where it terminates. It is a motor nerve to the diaphragm.
 
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