Muscles of the Shoulder and Arm

Question 1

Origin of the supraspinatus

Answer 1

Supraspinous fossa

Question 2

Insertion of the supraspinatus

Answer 2

Greater/lesser tubercles of the humerus

Question 3

Action of the supraspinatus

Answer 3

Extend and stabilize shoulder

Question 4

Innervation of supraspinatus

Answer 4

suprascapular nerve

Question 5

Blood supply of supraspinatus

Answer 5

suprascapular, caudal circumflex humeral, collateral arteries

Question 6

Origin of infraspinatus

Answer 6

Infraspinous fossa

Question 7

Insertion of infraspinatus

Answer 7

greater tubercle of humerus

Question 8

Innervation of infraspinatus

Answer 8

suprascapular nerve

Question 9

Blood supply of infraspinatus

Answer 9

Suprascapular branches

Question 10

Function of infraspinatus

Answer 10

flex and stabilize the shoulder

Question 11

The tendon of which muscle creates a bursa over the greater tubercle of the humerus, which acts to reduce friction

Answer 11

Infraspinatus

Question 12

Origin of the deltoid m

Answer 12

Spine of the scapula +/- acromion

Question 13

Insertion of the deltoid m

Answer 13

Deltoid tuberosity

Question 14

Action of the deltoid m

Answer 14

flex, abduct and stabilize the shoulder

Question 15

Innervation of deltoid m

Answer 15

Axillary n

Question 16

Blood supply of deltoid m

Answer 16

Subscapular branches

Question 17

Origin of teres major m

Answer 17

Caudal border (caudal angle) of scapula

Question 18

Insertion of teres major m

Answer 18

teres major tuberosity of the humerus

Question 19

Innervation of teres major m

Answer 19

Axillary n

Question 20

Blood supply of teres major m

Answer 20

Subscapular a and collateral branches

Question 21

Action of teres major m

Answer 21

Flex shoulder

Question 22

Origin of subscapularis m

Answer 22

subscapular fossa

Question 23

Insertion of subscapularis m

Answer 23

lesser tubercle of humerus

Question 24

Innervation of subscapularis m

Answer 24

Subscapular nn

Question 25

Blood supply of subscapularis m

Answer 25

Subscapular a and collateral branches

Question 26

The axial nerve inserts between the border of which two muscles, making it a good landmark?

Answer 26

Teres major m and subscapularis m

Question 27

Action of subscapularis

Answer 27

Adduct and extend shoulder

Question 28

Origin of coracobrachialis

Answer 28

coracoid process of scapula

Question 29

Insertion of coracobrachialis

Answer 29

Lesser tubercle of humerus

Question 30

Action of coracobrachialis

Answer 30

flex shoulder

Question 31

Innervation of coracobrachialis

Answer 31

Musculocutaneous nn

Question 32

What muscle is coracobrachialis commonly fused with in sheep?

Answer 32

The medial head of the tricep

Question 33

What is the role of teres MINOR

Answer 33

Flexes and stabilizes the shoulder

Question 34

Origin of triceps brachii

Answer 34

Caudal edge of scapula or humerus

Question 35

Innervation of triceps brachii

Answer 35

radial n

Question 35

Insertion of triceps brachii

Answer 35

olecranon

Question 35

Origin of tensor fascia antibrachii

Answer 35

Latissimus dorsi

Question 36

Blood supply of triceps brachii

Answer 36

Subscapular branches and brachial artery

Question 37

What are the heads of the triceps brachii

Answer 37

Long head, lateral head, medial head, accessory head (best appreciated in dog)

Question 38

Insertion of tensor fascia antibrachii

Answer 38

Olecranon and antebrachial fascia

Question 39

Innervation of tensor fascia antibrachii

Answer 39

Radial

Question 40

Action of tensor fascia antibrachii

Answer 40

Extends and supports elbow

Question 41

Role of triceps brachii

Answer 41

Extend and stabilize the elbow

Question 42

Tensor fascia antibrachii is most caudal in ___________ and most medial in ________

Answer 42

sheep; rabbits

Question 43

Origin of anconeus

Answer 43

Olecranon fossa

Question 44

Insertion of anconeus

Answer 44

Olecranon

Question 45

Innervation of anconeus

Answer 45

Radial

Question 46

Action of anconeus

Answer 46

Extends and supports elbow; provides fatigue resistance when standing to keep elbow straight without using the triceps brachii

Question 47

Origin of biceps brachii

Answer 47

Supraglenoid tubercle of scapula

Question 48

Insertion of biceps brachii

Answer 48

radial tuberosity of radius

Question 49

Action of biceps brachii

Answer 49

Flex elbow and extend shoulder

Question 50

Innervation of biceps brachii

Answer 50

musculocutaneous

Question 51

What does the biceps brachii run through on its way from origin to insertion

Answer 51

The intertubercular groove

Question 52

What is the role of the intramuscular tendon and which muscle is it a part of

Answer 52

In the horse, is an energy saving mechanism; part of the biceps brachii

Question 53

Origin of brachialis

Answer 53

Brachial groove of humerus

Question 54

Insertion of brachialis

Answer 54

Radius

Question 55

Innervation of brachialis

Answer 55

musculocutaneous

Question 56

Action of brachialis

Answer 56

flex elbow