Illustrated Encyclopedia of Human Anatomic Variation: Opus III: Nervous System
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
In a., a long accessory from C4 loops in front of the
subclavian vein to join the phrenic proper; in b, the
accessory phrenic arises from the fifth cervical nerve in common with
the nerve to the subclavius, and after leaving this runs almost
horizontally to join the phrenic. Adapted from Decker, H. R.: J.
Thoracic Surg. 2:538, 1933.
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