Shoulder Muscles, Origin, Insertion, and Action

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Pectoralis Minor Origin

3rd-5th ribs

Serratus Anterior Origin

8th-9th ribs

Serratus Anterior Action

Abduction of the scapula

Serratus Anterior Insertion

Anterior medial border

Pectoralis Minor Insertion

Coracoid process

Pectoralis Minor Action

Depresses the scapula

Rhomboids Action

Elevates downward rotation of scapula

Teres major action

Extension of the shoulder

Latissimus dorsi origin

Illiac crest, inferior angle, thoracic vertebrae

Trapezius Origin

Occipital protuberance, spinous process C7-T12

Trapezius Insertion

Spine of scapula, acromion, 1/3 clavicle

Trapezius Action

Upper: extend, middle: elevate, lower: extend

Deltoid action

abduction of shoulder

Pectoralis major action

all: internal rotation, upper:flex, lower:extend

Latissimus dorsi insertion

bicipital groove of humerus

Coracobrachialis origin

coracoid process of scapula

Pectoralis major insertion

crest of greater tubercle of humerus

Teres major insertion

crest of lesser tubercle of humerus

Deltoid insertion

deltoid tuberosity of humerus

Levator Scapulae Action

elevates scapula

Triceps brachii action

extend shoulder

Latissimus dorsi action

extension of the shoulder

Infraspinatus action

external rotation

Teres minor action

external rotation

Coracobrachialis action

flexes and adducts arm

Biceps brachii action

flexion of shoulder

Infraspinatus insertion

greater tubercle of humerus

Supraspinatus insertion

greater tubercle of humerus

Teres minor insertion

greater tubercle of humerus

Teres major origin

inferior angle of scapula

Triceps brachii origin

infraglenoid tubercle of scapula

Infraspinatus origin

infraspinous fossa of scapula

Subscapularis action

internal rotation

Deltoid origin

lateral 1/3 of clavicle, acromion, spine of scapula

Teres minor origin

lateral border of scapula

Subscapularis insertion

lesser tubercle of humerus

Rhomboids Insertion

medial border of scapula

Coracobrachialis insertion

medial surface of humerus

Triceps brachii insertion

olecranon process

Biceps brachii insertion

radial tuberosity of radius

Biceps brachii origin

short head: coracoid process of scapula long head: supraglenoid tubercle of scapula

Supraspinatus action

shoulder abduction

Rhomboids Origin

spinous processes of C7-T5

Pectoralis major origin

sternum, midline of clavicle, 1-6 ribs

Subscapularis origin

subscapular fossa

Levator Scapulae Insertion

superior angle of scapula

Supraspinatus origin

supraspinous fossa of scapula

Levator Scapulae Origin

transverse processes of C1-C4


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