Lower level of formation of lateral cord, variable formation of median nerve and communications between median and musculocutaneous nerve

Gangadhara Muninarayana Swamy,Krishna Kishore G,Manivannan K,H R Krishna Rao,Shakunthala Rao N

doi:10.7439/ijbar.v5i9.889

Abstract

Brachial plexus are the bunch of nerves which are formed in the neck and axilla for supplying the upper limb. During routine dissection of the axilla for academic purpose we have noticed the variation in the formation of lateral cord, median nerve and its communications with the musculocutaneous nerve on both the upper limbs. The variations of brachial plexus even though they are common, have got very important clinical and surgical importance, knowledge of which is very important for surgeons, orthopedicians and anesthetists. An attempt has made to add the information of case to the existing knowledge in the literature.

Highlights

The union of the ventral rami of the fifth, sixth, seventh and eighth cervical nerves and first thoracic nerve form the brachial plexus
In the infraclavicular part of the brachial plexus the cords lie posterior to the first part of the axillary artery but, descending posterior to pectoralis minor, they pass into positions relative to the second part of the axillary artery which correspond to their names
Median nerve is formed by two roots derived from lateral cord and medial cord, which embrace the third part of the axillar ar tery, and unite anterior or lateral to it

Summary

Introduction

The union of the ventral rami of the fifth, sixth, seventh and eighth cervical nerves and first thoracic nerve form the brachial plexus. These rami unit, divide and unit again to form the trunks, anterior and posterior divisions and the cords of brachial plexus and these cords and their branches appear in the axilla grouped around the axillary artery[1]. Musculocutaneous nerve is the terminal branch of the lateral cord, arises at the lower border of the pectoralis min or. It pierces the coracobrachialis muscle and enters the arm. Some fibres of the median nerve may run in the musculocutaneous nerve, leaving it to join their proper trunk; less frequently the reverse occurs, and the median nerve sends a branch to the musculocutaneous nerve[3]

Methods

Findings

Discussion

Conclusion