Question

Highlight moments of the; Sternoclavicular joints, Acromioclavicular joints scapular and glenohumeral joint during movements of the shoulder and shoulder girdle. List out the key muscles involved, highlighting their origins and insertions as well as their contributions to the outlined movements.

Answer 1

Joint	Muscle	Origin	Insertion	Movement
Sternoclavicular joints	Serratus anterior muscle, rhomboid and trapezius muscles	Articulation of the medial aspect of the clavicle and the manubrium of the sternum	Anterior and posterior surfaces of the manubrium	Movement of the clavicle in three planes, predominantly in the anteroposterior and vertical plane
Acromioclavicular joints	Pectoralis Major (Clavicular Head), Sternocleidomastoid, Deltoid, Trapezius	Junction of the lateral clavicle and the acromion process of the scapula and plane style synovial joint.	Clavicle	Upward/Downward Rotation about an axis Anterior/Posterior tipping or tilting about an axis directed laterally and anteriorly
Scapular and Glenohumeral joint during movements of the shoulder	Rotator cuff	Coracoid process and attaches to the greater tubercle	Glenoid fossa of scapula and the head of humerus	Abduction, flexion, extension, internal rotation, external rotation, and 360° circumduction
Shoulder girdle	Serratus anterior, pectoralis minor, levator scapulae, rhomboids, and trapezius	Spinous processes of C7-T5.	Medial border of the scapula, below the level of the spine of the scapula.	Flexion, extension, abduction, adduction, rotation (medial and lateral rotation), and circumduction