Muscles primarily acting at GH Joint

Question 1

Supraspinatus- O

Answer 1

Supraspinous fossa of scapula

Question 2

Supraspinatus- I

Answer 2

Greater tubercle of humerus

Question 3

Supraspinatus- N

Answer 3

Suprascaular n.

Question 4

Supraspinatus- A

Answer 4

Extend and laterally stabilize the shoulder joint

Question 5

Infraspinatus- O

Answer 5

Infraspinous fossa of scapula

Question 6

Infraspinatus- I

Answer 6

Lateral side of greater tubercle of humerus

Question 7

Infraspinatus- N

Answer 7

Suprascapular n.

Question 8

Infraspinatus- A

Answer 8

Extend and laterally stabilize or flex the GH joint (depending on degree of extension or position of the join when the muscle contracts); abduct the shoulder joint; rotate the shoulder lateral; prevent medial rotation when weight bearing and provide lateral stability to the shoulder joint

Question 9

Deltoideus (a. Scapular part, b. Acromial part)- O

Answer 9

a. Spine of scapula

b. Acromion of scapula

Question 10

Deltoideus- I

Answer 10

Deltoid tuberosity of humerus

Question 11

Deltoideus- N

Answer 11

Axillary n.

Question 12

Deltoideus- A

Answer 12

Flex the shoulder joint; advances limb

Question 13

Teres major- O

Answer 13

The caudal angle and adjacent cadual border of the scapula; the caudal surface of the subscapularis

Question 14

Teres major- I

Answer 14

Teres major tuberosity of humerus

Question 15

Teres major- N

Answer 15

Axillary n.

Question 16

Teres major- A

Answer 16

Flex the shoulder joint, rotate the shoulder medially, and prevent lateral rotation when bearing weight

Question 17

Teres minor- O

Answer 17

Infraglenoid tubercle and dorsal third of caudal border of scapulla

Question 18

Teres minor- I

Answer 18

Teres minor tuberosity of humerus

Question 19

Teres minor- N

Answer 19

Axillary n.

Question 20

Teres minor- A

Answer 20

Flex the shoulder joint, rotate the shoulder laterally, and prevent medial rotation when bearing weight

Question 21

Subscapularis- O

Answer 21

Subscapular fossa of scapula

Question 22

Subscapularis- I

Answer 22

Lesser tubercle of humerus

Question 23

Subscapularis- N

Answer 23

Subscapular n.

Question 24

Subscapularis- A

Answer 24

Adduct, extend, and medially stabillize the shoulder joint; rotate the shoulder medially and prevent lateral rotation when bearing weight

Question 25

Coracobrachialis- O

Answer 25

Coracoid process of scapula

Question 26

Coracobrachialis- I

Answer 26

Lesser tubercle of humerus, proximal to Teres major tuberosity

Question 27

Coracobrachialis- N

Answer 27

Musculocutaneous n.

Question 28

Coracobrachialis- A

Answer 28

Adduct, extend, and stabilize the shoulder joint

Question 29

Which muscles primarily acting at the GH joint is part of the ‘Lateral group’?

Answer 29

Supraspinatus, Infraspinatus

Question 30

Which muscles primarily acting at the GH joint is part of the ‘Caudal group’?

Answer 30

Deltoideus (scapular part, acromial part), Teres major, Teres minor

Question 31

Which muscles primarily acting at the GH joint is part of the ‘Medial group’?

Answer 31

Subscapularis, Coracobrachialis