The brachial plexus innervates the entire upper limb – except part of the skin of the upper half of the medial arm which is innervated by the intercostobrachial nerve
The intercostobrachial nerve is synonymous to the lateral cutaneous branch of the second intercostal nerve
The intercostobrachial nerve joins the medial cutaneous nerve of the arm to supply the skin of the upper half of the medial arm
The green colour depicts the intercostobrachial nerve which branches off as the lateral cutaneous nerve of the second intercostal nerve The intercostobrachial nerve is not part of the brachial plexus
