extremities

Question 1

Trapezius (upper, middle, lower)

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; 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 (major, minor)

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

Answer 4

Question 5

Pectoralis minor

Answer 5

Origin: Ribs 3-5
Insertion: Coracoid process of scapula
Action: Elevates ribs, draws scapula down and medially
Innervation: Medial pectoral nerve

Question 6

Serratus Anterior

Answer 6

Origin: Upper 8-9 ribs
Insertion: Medial border of scapula
Action: Protraction of scapula
Innervation: Long thoracic nerve

Question 7

Answer 7

Question 8

Deltoid

Answer 8

Origin: Clavicle and scapula
Insertion: Deltoid tuberosity of humerus
Action: Abduction at shoulder (whole muscle)
Innervation: Axillary nerve

Question 9

Pectoralis major

Answer 9

Origin: Ribs 2-6, body of sternum
Insertion: Greater tubercle of humerus
Action: Flexion, adduction and medial rotation at shoulder
Innervation: Pectoral Nerves

Question 10

Supraspinatus- (above spine of scapula)

Answer 10

Origin: Supraspinatus fossa of scapula
Insertion: Greater tubercle of humerus
Action: Abduction at the shoulder
Innervation: Suprascapular nerve

Question 11

Infraspinatus (below spine of scapula)

Answer 11

Origin: Infraspinatus fossa of scapula
Insertion: Greater tubercle of humerus
Action: Lateral rotation at shoulder
Innervation: Suprascapular nerve

Question 12

Teres Minor

Answer 12

Origin: Lateral border of scapula
Insertion: Greater tubercle of humerus
Action: Lateral rotation at shoulder
Innervation: Axillary nerve

Question 13

Teres Major – not part of the rotator cuff

Answer 13

Origin: Inferior angle of scapula
Insertion: Intertubercular groove of humerus
Action: Extension, adduction, and medial rotation at shoulder
Innervation: Lower subscapular nerve

Question 14

Subscapularis- along inner surface of the scapula

Answer 14

Origin: Subscapular fossa of scapula
Insertion: Lesser tubercle of humerus
Action: Medial rotation at the shoulder
Innervation: Subscapular nerves

Question 15

Latissimus Dorsi

Answer 15

Origin: Spinous process of inferior thoracic and lumbar vertebrae, ribs 8-12
Insertion: Intertubercular groove of humerus
Action: Extension, adduction, and medial rotation at shoulder
Innervation: Thoracodorsal nerve

Question 16

Coracobrachialis

Answer 16

Origin: Coracoid process of scapula
Insertion: Medial shaft of humerus
Action: Adduction and flexion at shoulder
Innervation: Musculocutaneous nerve