Final answer:
The primary movers of the arm at the shoulder joint are the deltoid, subscapularis, supraspinatus, infraspinatus, teres major, teres minor, and coracobrachialis muscles. They allow the arm to perform a variety of movements, including abduction, flexion, medial rotation, extension, lateral rotation, adduction, and rotation.
Step-by-step explanation:
Muscles That Move the Arm at the Shoulder Joint
The primary movers of the arm at the shoulder joint include the deltoid, subscapularis, supraspinatus, infraspinatus, teres major, teres minor, and coracobrachialis muscles.
The deltoid is the major abductor of the arm and also facilitates flexion, medial rotation, extension, and lateral rotation.
The subscapularis medially rotates the arm.
The supraspinatus abducts the arm.
The infraspinatus laterally rotates the arm.
The teres major extends the arm and assists in adduction and medial rotation.
The teres minor laterally rotates and extends the arm.
The coracobrachialis flexes and adducts the arm.
Overall, these muscles work together to move the arm in different directions at the shoulder joint.