Describe the typical distribution of the upper extremity tinglong and numbness in tos, and explain why this distribution occurs more commonly.

The typical distribution of the upper extremity tinlong and numbness is caused by compression of the brachial plexus  of the c8-t1 nerve.

Explanation:

The thoracic outlet syndrome is generated by a compression of the brachial plexus in the upper thoracic strait that can be permanent or occur at times. Compression of the subclavian artery or vein can also be generated and the vertebral artery can even be compromised in the costclavicular space.

The portion of the plexus that is usually most affected is the lower primary trunk, this because this is the most neural structure close to the first rib or cervical rib if it exists.

In this syndrome, a set of symptoms can be generated in the upper limb, in the thorax, in the neck, shoulders and head.Paresthesias occur intermittently or permanently due to the compression of the C8-T1 nerve roots and the medial bundle of the brachial plexus. They can also produce chest pain of the anginal type.In addition, among the arterial symptoms that it can produce is tingling and numbness in arms and hands and fatigue of the same when maintaining a position for a prolonged time. And among the venous symptoms that can occur is the edema of arms and fingers

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