GROSS ANATOMY
BRACHIAL PLEXUS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Lateral cutaneous branch of 2nd intercostal nerve and Medial cutaneous nerve of arm
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Lateral cutaneous branch of the 2nd intercostal nerve and Medial cutaneous nerve of forearm
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Lateral cutaneous branch of 2nd, 3rd intercostal nerve and Medial cutaneous nerve of arm
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Lateral cutaneous branch of 2nd, 3rd intercostal nerve and Medial cutaneous nerve of forearm
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Detailed explanation-1: -The intercostobrachial nerve (ICBN) is a nerve classically originating from the lateral cutaneous branch of the second intercostal nerve [1]. The ICBN functions to innervate portions of the axilla, tail of the breast, lateral chest wall and medial side of the arm [2-3].
Detailed explanation-2: -ICBN also communicates with the brachial plexus in 40% of cases, via the medial brachial cutaneous nerve and the medial cord.
Detailed explanation-3: -Note that the lateral cutaneous branch of the second intercostal nerve is known as the intercostobrachial nerve, which supplies the floor of the axilla and upper posteromedial region of the upper extremity.
Detailed explanation-4: -The medial cutaneous nerve of the forearm, also known as the medial antebrachial cutaneous nerve, is a branch of the medial cord of the brachial plexus and supplies the anterior and medial aspects of the forearm as far distal as the wrist.
Detailed explanation-5: -The second intercostal nerve, which often contributes to the brachial plexus, also has a distribution like that of a typical intercostal nerve, except that its lateral cutaneous branch passes into the arm as the intercostobrachial nerve.