PMID: 2508409Feb 1, 1989Paper

A morphological study on the coracobrachialis muscle

Kaibogaku zasshi. Journal of anatomy
M Koizumi

Abstract

The musculocutaneous nerve (MC) usually pierces the coracobrachialis muscle (cbr) in man. However in rare cases it does not pierce the muscle but runs downward adhering to the median nerve. Although this unusual course of MC is well noted in the literature, there has been no satisfactory explanation given for its derivation. The present author thought that cbr was a composite muscle innervated by at least two different nerves and a change in composition of the muscle parts might have something to do with the change in the course of MC. Therefore MC, cbr and its nerve supply were observed in 240 human arms. The nerve fiber analysis of MC and the branches to cbr were made in 27 arms, specially selected from them. Additionally, to correlate the results of humans and other mammals, the same analysis was performed using 4 prosimian arms (3 species). The results were as follows: 1. The nerve branches innervating human cbr could be classified into three groups. The first group branches were those constant in appearance, arising from MC and usually innervating the largest area of cbr. The author designated these branches Rmc (branches of MC). The second group consisted of a branch which arose from the middle trunk of the brachial plexu...Continue Reading

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