ANATOMY

Detailed explanation-1: -Muscles that work with the deltoid include the supraspinatus, infraspinatus, teres minor, and the subscapularis. These muscles help initial abduction from 0 to 15 degrees and stabilize the glenohumeral joint when the deltoid works to abduct past 15 degrees.

Detailed explanation-2: -The primary muscles involved in the action of arm abduction include the supraspinatus, deltoid, trapezius, and serratus anterior.

Detailed explanation-3: -The trapezius and serratus anterior muscles work in tandem to coordinate rotation and movement of the scapula to accommodate the full range of motion of the arm. Specifically, they facilitate abduction of the arm from 90 degrees and further upwards.

Detailed explanation-4: -Your deltoid muscles work alongside your other shoulder muscles, such as the rotator cuff muscles, to help you perform a variety of movements. Deltoid muscle functions include: Arm abduction, which means raising your arm out to the side of your body.

Detailed explanation-5: -All heads of the deltoid work together to produce abduction of the Shoulder Joint. It helps lift the arm front, side, and backward.