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 this case the nerve
sheaths have not been dissected away at all, and only the chief branches of the
plexus are shown. There is no outer cord as usually formed, but the musculocutaneous
is seen arising from the ventral branch of 5-6 C., which also gives a descending
branch, which is joined by a ventral branch from 7 C., to form the outer head
of the median. Note the large lower ventral branch of 7 C. which passed behind
the subclavian artery to reach the inner cord; this gave a large bundle to the
ulnar. This arrangement of branches to the outer cord is very unusual, with the
musculo-cutaneous being given off from 5-6 before the ventral branches of 5-6-7
have joined to form the outer cord. I have only seen it amongst animals in some
of the Marsupials, and in one of the Edentata; in a large Wallaroo (Macropus robustus),
and in Dasyurus viverrinus, a quadrupedal carnivorous marsupial; and also in the
Armadillo (Dasypus villosus)."
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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