What muscles allow you to abduct your arm?

What muscles allow you to abduct your arm?

The primary muscles involved in the action of arm abduction include the supraspinatus, deltoid, trapezius, and serratus anterior.

What nerve is responsible for arm abduction?

The major branches of the axillary nerve include the lateral cutaneous nerve of the arm and motor branches to the deltoid and teres minor muscles (C5–C6). Axillary nerve injuries cause weakness of arm abduction, deltoid muscle atrophy with severe axonal injuries, and sensory loss along the upper lateral arm.

What does shoulder impingement feel like?

People with shoulder impingement usually experience general stiffness and throbbing in the shoulder. This type of pain may resemble that of a toothache, rather than the tearing pain of an injured muscle. The person may also see or feel swelling in their shoulder.

What rotator cuff muscle abducts the shoulder?

Stabilizing the head of the humerus in the shoulder joint: The supraspinatus, infraspinatus, teres minor, and subscapularis muscles all work together to achieve this. Abducting or elevating the shoulder joint out to the side: These motions are performed by the supraspinatus.

Why can deltoid not initiate abduction?

An inability to initiate abduction of the arm (up to approximately 15 degrees of abduction) would indicate involvement of the supraspinatus muscle or the nerve innervating it, the suprascapular nerve. To properly test the function of the deltoid and the axillary nerve, the arm must be beyond 15 degrees of abduction.

What happens if you leave a rotator cuff tear untreated?

If left untreated, a rotator cuff tear can severely restrict function and range of motion. The tears can also increase over time. This may cause partial rotator cuff tears to progress to total tears.

What is quadrilateral space syndrome?

Quadrilateral space syndrome (QSS) is a rare disorder characterized by axillary nerve and posterior humeral circumflex artery (PHCA) compression within the quadrilateral space. Impingement is most frequently due to trauma, fibrous bands, or hypertrophy of one of the muscular borders.