Posterior Shoulder

Question 1

Deltoid: Origin

Answer 1

Lateral 1/3 of clavicle, Acromion, spine of scapula

Question 2

Deltoid: Insertion

Answer 2

Deltoid tuberosity

Question 3

Deltoid: Innervation

Answer 3

Axillary nerve (C5, C6)

Question 4

Deltoid: Action

Answer 4

Clavicular: medial rotation, flexion
Acromial: abduction
Spinal: lateral rotation, extension

Question 5

Deltoid: Arterial supply

Answer 5

Thoracoacromial artery, anterior + posterior circumflex humeral artery, and circumflex scapular artery

Question 6

Teres major: Origin

Answer 6

Inferior part of lateral border of scapula
Posterior Surface of the inferior angle

Question 7

Teres major: Insertion

Answer 7

Medial lip of intertubercular sulcus

Question 8

Teres major: Innervation

Answer 8

Lower subscapular nerve (C5, C6)

Question 9

Teres major: Action

Answer 9

Medial rotation and adduction

Question 10

Teres major: Arterial supply

Answer 10

Subscapular + posterior circumflex humeral, and circumflex scapular artery

Question 11

Teres minor: Origin

Answer 11

Lateral border of scapula

Question 12

Teres minor: Insertion

Answer 12

Middle facet of the greater tubercle

Question 13

Teres minor: Innervation

Answer 13

Axillary nerve (C5, C6)

Question 14

Teres minor: Action

Answer 14

Lateral rotation and stability of joint

Question 15

Teres minor: Arterial supply

Answer 15

Subscapular artery, circumflex scapular artery, and posterior circumflex humeral artery

Question 16

Subscapularis: Origin

Answer 16

Subscapular fossa

Question 17

Subscapularis: Insertion

Answer 17

Lesser tubercle

Question 18

Subscapularis: Innervation

Answer 18

Upper and lower subscapular nerves (C5, C6)

Question 19

Subscapularis: Action

Answer 19

Medial rotation, adduction, stability of joint

Question 20

Subscapularis: Arterial supply

Answer 20

Subscapular, suprascapular, and circumflex scapular arteries

Question 21

Supraspinatus: Origin

Answer 21

Supraspinous fossa

Question 22

Supraspinatus: Insertion

Answer 22

Superior facet of greater tubercle

Question 23

Supraspinatus: Innervation

Answer 23

Suprascapular nerve (C5, C6)

Question 24

Supraspinatus: Action

Answer 24

Initiates abduction

Question 25

Supraspinatus: Arterial supply

Answer 25

Suprascapular artery

Question 26

Infraspinatus: Origin

Answer 26

Infraspinous fossa

Question 27

Infraspinatus: Insertion

Answer 27

Inferior facet of greater tubercle

Question 28

Infraspinatus: Innervation

Answer 28

Suprascapular nerve (C5, C6)

Question 29

Infraspinatus: Action

Answer 29

Lateral rotation, stability of joint

Question 30

Infraspinatus: Arterial supply

Answer 30

Suprascapular and circumflex scapular arteries

Question 31

Triceps brachii: Origin

Answer 31

Long head: infraglenoid tubercle of the scapula Lateral head: posterior humerus, superior to radial groove Medial head: posterior humerus, inferior to radial groove

Question 32

Triceps brachii: Insertion

Answer 32

Proximal olecranon process of ulna + fascia of the forearm

Question 33

Triceps brachii: Innervation

Answer 33

Radial nerve (C5, C6, C7)

Question 34

Triceps brachii: Action

Answer 34

Chief extensor of the elbow Long head: resists dislocation during abduction

Question 35

Triceps brachii: Arterial supply

Answer 35

Deep brachial artery