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The deltoid muscle is a rounded, triangular muscle located on the uppermost part of the arm and the top of the shoulder. which is shaped like an equilateral triangle . It comprises 3 distinct portions each of which produces a different movement of the glenohumeral joint, The deltoid muscle is the muscle forming the rounded contour of the human shoulder. It is also known as the 'common shoulder muscle'. we can see Muscles as anterior deltoid and posterior deltoid as it covers the whole shoulder from above. lateral deltoid is the lateral view of the shoulder. Like many other muscles, the deltoid can be sore for a variety of reasons, including overuse and tendon injuries. the common word for that is deltoid muscle pain. DELTOID ORIGIN: The deltoid has three origins : the lateral end of the clavicle,  the acromion of the scapula at the top of the shoulder, and  the spine of the scapula. DELTOID INSERTION: deltoid tuberosity of humerus. DELTOID Mu

The latissimus dorsi is a large, flat muscle on the back that stretches to the sides, behind the arm, and is partly covered by the trapezius on the back near the midline. ORIGIN: The latissimus dorsi originates via lumbodorsal fascia into spines of T7-L5, lower 4 ribs & iliac crest. INSERTION: The latissimus dorsi is inserted at the floor of the intertubercular groove of the humerus. ACTION: the agonist of arm extension. powerful arm adductor. medially rotates arm & shoulder. depresses scapula. pulls the body upward & forward with arms fixed overhead. NERVE SUPPLY: The latissimus dorsi is innervated by the sixth, seventh, and eighth cervical nerves through the thoracodorsal (long scapular) nerve.

ORIGIN:  spinous processes of C7 & T1. INSERTION: medial border of the scapula. ACTION: Rhomboid minor and Rhomboid major are working together as a whole to perform the movement. retract scapula (squaring shoulders), synergist with middle fibers of Trapezius. rotate glenoid cavity downward (lowering arm against resistance). stabilize scapula. NERVE SUPPLY: Dorsal scapular nerve

It is a diamond-shaped quadrilateral Muscle. The trapezius has three functional parts: an upper (descending) part which supports the weight of the arm; a middle region (transverse), which retracts the scapula; and a lower (ascending) part which medially rotates and depresses the scapula. ORIGIN: occipital bone, ligamentum nuchae, spines of C7 - T12. INSERTION:  spine & acromion ofscapula, lateral 3rd of clavicle. ACTION: stablizes, raises, retracts & rotates scapula. adducts & retracts scapula (middle). elevates scapula or synergist to head extension (suprior). depresses scapula & shoulder (inferior). NERVE SUPPLY: Accesory nerve

Serratus anterior(boxer’s muscle) | SHOULDER MOVERS ORIGIN:  by series of muscle slips from ribs 1-9. INSERTION:  the anterior surface of the vertebral border of the scapula. ACTION:  an agonist to protract & hold scapula against the rib cage rotates scapula (inferior angle laterally & upward) abduct & raise arm & horizontal arm movements. NERVE SUPPLY: The long thoracic nerve.

ORIGIN:   costal cartilage of rib 1. INSERTION: groove on the inferior surface of the clavicle. ACTION:   stablizes & depresses pectoral girdle. NERVE SUPPLY :  Nerve to subclavius

ORIGIN:   the anterior surface of ribs 3-5 (or 2-4) INSERTION:   coracoid process of scapula ACTION: draws scapula forward & downward (ribs fixed). draws rib cage superiorly (scapula fixed). NERVE SUPPLY : Both pectoral nerves Supply to this muscle.