ANATOMY

Detailed explanation-1: -Tendons connect each of the three side to bones. The base of the deltoids connects to the upper part of your scapula (shoulder blade) and the side of your clavicle (collarbone). The point of the deltoids attaches to the side of your humerus (the arm bone between your shoulder and elbow).

Detailed explanation-2: -The rotator cuff connects the humerus to the scapula and is made up of the tendons of four muscles, the supraspinatus, infraspinatus, teres minor and the subscapularis.

Detailed explanation-3: -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-4: -The scapulohumeral muscles are muscles that connect the scapula to the humerus. [1] The articulation between the glenoid area of the scapula and the head of the humerus is between the joints with greater ability to perform active and passive movements.

Detailed explanation-5: -The trapezius, levator scapulae, and rhomboids originate from the base of the skull and/or spine and connect the scapula and clavicle to the trunk of the body.