upper limb- muscle

Question 1

What type of joint is the shoulder?

Answer 1

Ball and socket joint

Question 2

What is the action of the infraspinatus muscle?

Answer 2

External/Lateral rotation

The infraspinatus is one of the intrinsic muscles of the scapula.

Question 3

Which muscle is responsible for internal/medial rotation?

Answer 3

Subscapularis, pectoralis major, latissimus dorsi, teres major, anterior deltoid

Question 4

List the muscles involved in shoulder flexion.

Answer 4

• Pectoralis major
• Anterior deltoid
• Coracobrachialis
• Biceps brachii

Question 5

What muscles contribute to shoulder extension?

Answer 5

Latissimus dorsi, teres major, posterior deltoid

Question 6

Which muscles are responsible for shoulder abduction?

Answer 6

Supraspinatus, deltoid

Question 7

What muscles are involved in shoulder adduction?

Answer 7

• Pectoralis major
• Latissimus dorsi
• Teres major
• Coracobrachialis

Question 8

What is the origin of the supraspinatus muscle?

Answer 8

Medial two-thirds of supraspinatus fossa

Question 9

Where does the supraspinatus muscle insert?

Answer 9

Superior aspect of greater tubercle of humerus

Question 10

What are the primary actions of the supraspinatus muscle?

Answer 10

• Abduction
• Shoulder stabilisation

Question 11

What is the origin of the infraspinatus muscle?

Answer 11

Medial aspect of the infraspinatus fossa

Question 12

Where does the infraspinatus muscle insert?

Answer 12

Posterior aspect of greater tubercle of humerus

Question 13

What are the primary actions of the infraspinatus muscle?

Answer 13

• External rotation
• Shoulder stabilisation

Question 14

True or False: The shoulder is a stable joint.

Answer 14

False

Question 15

Why are intrinsic scapular muscles important?

Answer 15

To keep the head of the humerus in the shoulder joint