Question

neurogenic thoracic outlet syndrome typically involves compression of what part of the brachial plexus? lower trunk ulnar nerve middle trunk posterior cord

Explanation:

Neurogenic Thoracic Outlet Syndrome occurs when structures of the brachial plexus are compressed. The lower trunk of the brachial plexus, formed by the C8 and T1 nerve roots, is positioned in a way that makes it vulnerable to compression from the cervical ribs, scalene muscles, or fibrous bands in the thoracic outlet region, which is the primary site of involvement in this condition.

Answer:

Lower trunk