Intercostobrachial nerve supplying the entire medial side of the arm

The intercostobrachial nerve is the lateral cutaneous branch of 2^nd intercostal nerve which supplies the skin of axilla and upper part of medial side of arm. The medial cutaneous nerve of arm is the branch of medial cord of Brachial Plexus which supplies the rest of medial side of arm. During routine dissection of upper limb of an adult male cadaver, the medial cutaneous nerve of arm was found to be absent on the left side. The intercostobrachial nerve was supplying the entire medial side of the left arm. On the right side the medial cutaneous nerve and intercostobrachial nerve were found normal.