The phrenic nerves arises chiefly from the fourth cervical nerve, but receives a branch from the third and another from the fifth (accessory phrenic nerves); (the fibers from the fifth occasionally come through the nerve to the Subclavius). 

This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from


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