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 is caused by compression of components of the brachial plexus in the thoracic outlet. The lower trunk of the brachial plexus is the most commonly affected structure in this condition, as it runs through the space prone to compression between the first rib and clavicle.

Answer:

Lower trunk