shoulder joint muscles Flashcards
the origin, insertion, and action of anterior deltoid
O: Anterior - Lateral 1/3 of clavicle
I; deltoid tuberosity
A; Anterior - Flexion, MR, horizontal
adduction, abduction
the origin, insertion, and action of middle deltoid
O’ the acomion process
I; deltoid tuberosity
A’ abduction
the origin, insertion, and action of posterior deltoid
O ; Posterior - Spine of scapula
I; deltoid tuberosity
A; Extension, LR, horizontal abduction, abduction
the origin, insertion, and action of supraspinatus
O: Supraspinous fossa of the scapula
I: Greater tubercle humerus
A: Shoulder abduction
the origin, insertion, and action of latissimus dorsi
O: Spinous processes T7-L5 (via dorsolumbar fascia),
posterior surface of sacrum,
iliac crest, and lower three ribs
I: Medial lip of bicipital groove of humerus
A: Shoulder extension, adduction, IR, hyperextension
he origin, insertion, and action of pectoralis major
O: Clavicle Portion: Medial 1/3 clavicle
Sternal Portion: Sternum, costal cartilage
ribs 1-6
I: Lateral lip bicipital groove
A: Clavicle Portion: Shoulder flexion to ~60°
Sternal Portion: Shoulder extension (first 60° from 180 degrees to 120 degrees) Together: Shoulder adduction, IR, horizontal adduction
the origin, insertion, and action of teres major
O: Axillary border of scapula near inferior angle
I:Crest below lesser tubercle next to the latissimus dorsi attachment
A: Shoulder extension, adduction, IR
the origin, insertion, and action of infraspinatus
O: Infraspinous fossa of scapula
I: Greater tubercle of humerus
A: Shoulder ER, horizontal abduction
the origin, insertion, and action of trees minor
O: Axillary border of scapula
I: Greater tubercle of humerus
A: Shoulder ER, horizontal abduction
the origin, insertion, and action of subscapularis
O: Subscapular fossa
I: Lesser tubercle of humerus
A: Shoulder IR
the origin, insertion, and action of coracobrachialis
O: Coracoid process of the scapula
I: Medial surface humerus, middle
A: Shoulder joint stabilization
