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Multiple bilateral neuroanatomical variations of the nerves of the arm

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Author(s): Chitra R

Journal: Neuroanatomy
ISSN 1303-1783

Volume: 6;
Issue: 1;
Start page: 43;
Date: 2007;
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Keywords: neuroanatomy | anatomy | musculocutaneous nerve | median nerve | coracobrachialis muscle | variation

ABSTRACT
Variations in the formation of median and musculocutaneous nerves are common but this is an interesting casereport of the variant formation and position of median nerve and musculocutaneous nerve and different types ofcommunications between the musculocutaneous and median nerves in both arms of the same cadaver. During educational dissection for the undergraduate students in our college, in a male cadaver of approximately50 years of Asian origin, in the region of axilla and arm, the variations of the median nerve and musculocutaneousnerves are observed. On the left side, the median nerve was formed medial to the third part of the axillary artery. The musculocutaneousnerve did not pierce the coracobrachialis muscle and it gave a communicating branch to the median nerve inthe distal third of the arm. On the right side, the musculocutaneous and median nerves were fused for 2 cms and then musculoctaneousand median nerves separated. The musculocutaneous nerve did not pierce the coracobrachialis and the mediannerve was medial to the axillary artery this side also.
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