Shoulder & Arm

Question 1

Deltoid

Answer 1

O- lateral 1/3 clavicle, acromion & spine of scapula

I- deltoid tuberosity of humerus

A- abduction of GH joint
flexion, horizontal adduction & internal rotation of GH joint
extension, horizontal abduction & external rotation of GH joint

N- axillary nerve

Question 2

Supraspinatus

Answer 2

O- supraspinous fossa of scapula

I- greater tubercle of humerus

A- abduction of shoulder

N- suprascapular nerve

Question 3

Infraspinatus

Answer 3

O- infraspinous fossa & inferior portion of spine of scapula

I- greater tubercle of humerus

A- external rotation of shoulder

N- suprascapular nerve

Question 4

Teres Minor

Answer 4

O- superior lateral border of scapula

I- greater tubercle of humerus

A- external rotation of shoulder

N- axillary nerve

Question 5

Subscapularis

Answer 5

O- subscapular fossa of scapula

I- lesser tubercle of humerus

A- internal rotation of shoulder

N- upper & lower subscapular nerves

Question 6

Teres Major

Answer 6

O- inferior, lateral border of scapular

I- medial lip of bicipital groove of humerus

A- internal rotation & adduction of shoulder

N- lower subscapular nerve

Question 7

Serratus Anterior

Answer 7

O- ribs 1-9

I- anterior medial border of scapula

A- protraction & upward rotation of scapula

N- long thoracic nerve

Question 8

Pectoralis Major

Answer 8

O- clavicular fibers: medial 1/2 of clavicle
sternal fibers: anterior sternum
costal fibers: costal cartilage ribs 1-6

I- lateral lip of bicipital groove of humerus

A- adduction & internal rotation of shoulder
horizontal adduction of shoulder

N- medial & lateral pectoral nerve

Question 9

Coracobrachialis

Answer 9

O- coracoid process of scapula

I- medial shaft of the humerus

A- flexion & adduction of shoulder
horizontal adduction of shoulder

N- musculocutaneous nerve

Question 10

Biceps Brachii

Answer 10

O- long head: supraglenoid tubercle & GH labrum
short head: coracoid process of scapula

I- radial tuberosity & bicipital aponeurosis

A- flexion & supination of elbow
flexion of shoulder

N- musculocutaneous nerve

Question 11

Brachialis

Answer 11

O- anterior distal 1/2 of humerus

I- ulnar tuberosity & coronoid process of ulna

A- flexion of elbow

N- musculocutaneous nerve

Question 12

Triceps Brachii

Answer 12

O- long head: infraglenoid tubercle & neck of scapula
lateral head: upper half of posterior surface of shaft of humerus
deep (medial) head: posterior shaft of humerus

I- olecranon process of ulna

A- extension of elbow

N- radial nerve