Question

Where do the cords of the brachial plexus transition into terminal branches?

a) At the cervical spine
b) In the axilla
c) At the level of the trunks
d) In the forearm

Answer 1

The cords of the brachial plexus transition into terminal branches in the axilla. This region is important as it marks the final reorganization of the complex network of nerves that supply the upper limb.

Step-by-step explanation:

The cords of the brachial plexus transition into terminal branches in the axilla (b). The brachial plexus is a network of nerves that originates from the spinal nerves C4 through T1 and is responsible for innervating the muscles and skin of the chest, shoulder, arm, and hand. This plexus progresses through different stages, starting from roots, trunks, divisions, cords, and finally forming the terminal branches as it passes into the axilla, which is the area under the shoulder joint where the arm connects to the shoulder.