Final answer:
Shoulder horizontal abduction is a movement involving the posterior deltoid that moves the arm away from the body in the horizontal plane. The deltoid is a complex muscle supporting various arm motions and is crucial for shoulder mobility and function. Shoulder injuries can adversely impact this and other movements.
Step-by-step explanation:
The shoulder horizontal abduction movement primarily involves the posterior deltoid muscle. This action is where the arm is moved away from the body in the horizontal plane, which is different from standard abduction where the arm moves in the sagittal plane. The deltoid muscle is a versatile shoulder muscle that not only participates in arm abduction but also plays a role in arm flexion, medial rotation, extension, and lateral rotation.
Injuries to the shoulder joint, such as those caused by repetitive use in sports, can affect the deltoid and associated structures like the rotator cuff, leading to conditions like adhesive capsulitis or "frozen shoulder." Understanding these movements and potential injuries is important for diagnosing shoulder issues and planning proper rehabilitation strategies.
The structure of other shoulder muscles like the supraspinatus, infraspinatus, subscapularis, teres major, teres minor, and coracobrachialis are integral in facilitating the wide range of movements our shoulders are capable of, including shoulder horizontal abduction.