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
"The connective tissue sheaths of the nerves are all dissected off, and thus the posterior and outer cords are seen resolved into their component parts. The branch to the outer cord from 5-6 C. has been divided in order to show the origin of the nerve to the coraco-brachialis; the branch from 8 C. to the inner cord has also been similarly divided to show the posterior branch of 1 D. Note the large size of the outer head of the ulnar, piercing directly through the inner head of the median. Note also that the inner head of the median is given off from the lower and anterior portion of the inner cord, and passes in front of the ulnar, which is given off from the posterior bundles of the inner cord."
From Harris, W. The true form of the brachial plexus, and its motor distribution. J. Anat. Physiol. 38:399-422, 1904.
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