Abstract
The musculocutaneous nerve drive from the brachial plexus’s lateral cord and it is one of the terminal branches of this plexus. Commonly, it pierces the coracobrachialis muscle and then innervates the anterior department muscles of the arm. It also course at the lateral part of the the forearm while it terminates as the lateral antebrachial cutaneous nerve. The course and branching pattern variations of the musculocutaneous nerve are reported by several authors previously. We found a very rare variation during the dissection of a 60 years old male cadaver. In our case, the musculocutaneous nerve had a varied course which hasn’t been determined until now. It was terminating in the distal third of the arm as divided into two major branches. While the lateral branch continued as the lateral antebrachial cutaneous nerve, the medial branch, which was thicker than the lateral branch, descended downward in the medial side of the arm and passed into the cubital fossa. This medial branch was nearly close to the vessels. Eventually it was attaching to the median nerve at the forearm. The information about these variations are very important for clinicians and surgeons because of the relationships between the medial branch’s course and the important of anatomical structures in the forearm.
Highlights
The musculocutaneous nerve (MCN) is one of the terminal branches of the brachial plexus and it’s responsible for innervation of the muscles of the anterior compartment in the arm
The proximal MCN arised normally from lateral cord of the brachial plexus and another the distal aberrant MCN arised from the median nerve, which was in the lower third of the arm
In type I, the connecting branch arises from MCN was at proximal of the entry point, in type II: the connecting branch leaved into the coracobrachialis from MCN and in type III: it leaved from MCN at distal of the entry point
Summary
The musculocutaneous nerve (MCN) is one of the terminal branches of the brachial plexus and it’s responsible for innervation of the muscles of the anterior compartment in the arm. Its sensory fibers disperse over the lateral surface of the forearm skin It arises from the ventral rami of the C5-7 spinal nerves, pierces the corocobrachialis muscle and descends obliquely between the biceps and brachialis muscles of the lateral side of the arm. Afterwards it pierces the deep fascia and continues as the lateral antebrachial cutaneous nerve of the forearm. MCN was arising from the lateral cord of the brachial plexus It was piercing the coracobrachialis muscle and passing obliquely to the lateral side of the arm between the brachialis and the biceps brachii muscles.
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