The middle trunk of the brachial plexus is formed by anterior rami of which spinal cord segment?

The middle trunk of the brachial plexus is formed by the merger of the anterior rami from the C7 spinal nerve. The brachial plexus is an important network of nerves that innervates the upper limb, and it is traditionally divided into roots, trunks, divisions, cords, and branches.

In this case, the middle trunk plays a crucial role in the formation of the nerves that provide motor and sensory functions to the arm and hand. By recognizing that the middle trunk originates solely from the C7 segment, one can understand its specific contribution to the overall structure and function of the brachial plexus. The other spinal cord segments or combinations mentioned do not directly assemble into the middle trunk, which is key to grasping the anatomy and workings of this nerve network.

Understanding the connections within the brachial plexus, especially how the trunks are formed from specific spinal cord segments, is fundamental in both clinical settings and anatomical studies.