Posterior Arm Muscles Flashcards
Trapezius
O: Occipital bone and spinous processes of C7 and thoracic vertebrae
I: Clavicle, acromion process and spine of scapula
A: Elevates, depresses and adducts the scapula
Levator scapulae
O: Transverse processes of cervical vertebrae
I: Superior medial border of the scapula
A: Elevates scapula
Rhomboids
O: Spinous processes of upper thoracic vertebrae
I: Medial border of the scapula
A: Adducts scapula
Latissimus dorsi
O: Thoracolumbar fascia
I: Intertubercular sulcus
A: Extends and adducts humerus
Supraspinatus
O: Supraspinous fossa
I: Greater tubercle
A: Abducts humerus
Infraspinatus
O: Infraspinous fossa
I: Greater tubercle
A: Laterally rotates humerus
Teres major
O: Dorsal surface of scapula
I: Lesser tubercle
A: Extends and adducts humerus
Teres minor
O: Lateral border of scapula
I: Greater tubercle
A: Laterally rotates humerus
Triceps brachii
O: Scapula and posterior humerus
I: Olecranon process
A: Extends forearm
Extensor carpi radialis
O: Lateral epicondyle of humerus
I: 2nd metacarpal
A: Extends wrist
Extensor carpi ulnaris
O: Lateral epicondyle of humerus
I: 5th metacarpal
A: Extends wrist
Extensor digitorum
O: Lateral epicondyle of humerus
I: Phalanges 2-5
A: Extends digits
