Shoulder Muscles, Origin, Insertion, and Action
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