Shoulder & Upper Limb Muscles

Question 1

Trapezius

Answer 1

ORIGIN: occipital bone, spinous process of T1-12

INSERTION: lateral clavicle, acromion, and scapular spine of scapula

ACTION: rotation, retraction, elevation, depression of scapula; extends neck and stabilizes shoulder

INNERVATION: Accessory nerve (Cranial Nerve 11)

Question 2

Levator scapulae

Answer 2

ORIGIN: transverse process of C1-4

INSERTION: medial border of scapula

ACTION: elevates scapula

INNERVATION: dorsal scapular nerve

Question 3

Rhomboids

Answer 3

ORIGIN: spinous process (minor: C7-T1) (major: T2-5)

INSERTION: medial border of scapula

ACTION: retraction of scapula

INNERVATION: dorsal scapular nerve

Question 4

Pectoralis minor

Answer 4

ORIGIN: ribs 3-5

INSERTION: coracoid process of scapula

ACTION: elevates ribs, draws scapula down and medially

INNERVATION: medial pectoral nerve

Question 5

Serratus Anterior

Answer 5

ORIGIN: upper 8-9 ribs

INSERTION: medial border of scapula

ACTION: protraction of scapula

INNERVATION: long thoracic nerve