Which spinal nerves contribute to the medial brachial cutaneous nerve?

Which spinal nerves contribute to the medial brachial cutaneous nerve?

• A. C5, C6
• B. C8, T1
• C. C7, C8
• D. T2, C8

Answer: (B)

The medial brachial cutaneous nerve is a cutaneous branch from the medial cord of the brachial plexus, carrying fibers from the lower trunk roots C8 and T1. It provides sensation to the medial aspect of the arm. While the intercostobrachial nerve (from T2) can communicate with it in some individuals, the primary contributors are C8 and T1, making those roots the correct answer. The other options either omit T1, include higher roots not typically involved in this cutaneous branch, or bring in T2 as a primary contributor, which is not the standard source for this nerve.

The medial brachial cutaneous nerve is a cutaneous branch from the medial cord of the brachial plexus, carrying fibers from the lower trunk roots C8 and T1. It provides sensation to the medial aspect of the arm. While the intercostobrachial nerve (from T2) can communicate with it in some individuals, the primary contributors are C8 and T1, making those roots the correct answer. The other options either omit T1, include higher roots not typically involved in this cutaneous branch, or bring in T2 as a primary contributor, which is not the standard source for this nerve.