: the fact or status of being a citizen of a particular place. : the qualities that a person is expected to have as a responsible member of a community. the fact or status of being a citizen of a particular place. : the qualities that a person is expected to have as a responsible member of a community.
What is thoracic outlet syndrome (TOS)? Thoracic outlet syndrome (TOS) is a condition caused by compression of nerves or blood vessels in the thoracic outlet, the area between the base of the neck and the armpit, including the front of the shoulders and chest. There are three types of TOS: Vascular. This can be a compression of the artery and vein.
Description. The thoracic outlet is an area at the top of the rib cage, between the neck and the chest. Several anatomical structures pass through this area, including the esophagus, trachea, and nerves and blood vessels that lead to the arm and neck region.horacic outlet syndrome. n. Compression of the brachial plexus and subclavian artery by attached muscles in the region of the first rib and the clavicle, characterized by pain in the arm, numbness in the fingers, and weakness in the hand muscles.