Question

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

Explanation:

Neurogenic Thoracic Outlet Syndrome is caused by compression of the lower trunk of the brachial plexus, which is formed by the C8 and T1 nerve roots. The other options are incorrect: the posterior cord, middle trunk, and ulnar nerve (a peripheral nerve, not a brachial plexus trunk/cord) are not the typical site of compression for this condition.

Answer:

Lower trunk