A 17-year-old boy presented to the office due to left arm numbness. He plays on the baseball team of his school and has been training for the last several weeks. week. He has been complaining of tingling and numbness involving the arm, the forearm, and the hand. Additionally, he complains of pain in the little finger and the hand. The pain is noticed to be exacerbated by overhead activities and throwing the ball. The patient is known to have an extra rib. Physical examination shows the weakness of the intrinsic muscles of the left hand. This patient's presentation is related to which of the following muscles?

Question

Quizplus · Accepted Answer

Eductional Objective: Compression of the brachial plexus at the scalene triangle leads to thoracic outlet syndrome. The scalene triangle is formed by the anterior and medial scalene muscle and the first rib. Thoracic outlet syndrome manifests with upper extremity tingling, numbness, and motor weakness. Symptoms are exacerbated with overhead activities.

A 17-Year-Old Boy Presented to the Office Due to Left