Intrinsic Muscles Of The Shoulder (rotator cuff muscle questions in 'shoulder')

Question 1

Why are intrinsic shoulder muscles classified as intrinsic?

Answer 1

Because they originate from the scapula and/or clavicle and attach to the humerus

Question 2

What are the 6 intrinsic muscles of the shoulder?

Answer 2

Deltoid, teres major, teres minor, supraspinatus, infraspinatus, subscapularis

Question 3

What are the 3 parts of the deltoid called?

Answer 3

Anterior, middle and posterior

Question 4

Where does the deltoid muscle attach to?

Answer 4

Originates from the scapula and clavicle and attached to the deltoid tuberosity

Question 5

What nerve innervated the deltoid?

Answer 5

The Axillary nerve

Question 6

What is the action of the anterior fibres deltoid muscle?

Answer 6

Flex the arm at the shoulder

Question 7

What is the action of the posterior fibres of the deltoid muscle?

Answer 7

Extends the arm at the shoulder

Question 8

What is the action of the middle fibres of the deltoid muscle?

Answer 8

Abductor of the arm (15-90 degrees)

Question 9

What is the attachment of the teres major shoulder muscle?

Answer 9

Originates from the posterior surface of the inferior angle of the scapula and attached to the bicipital groove of the humerus

Question 10

What nerve innervates the teres major muscle?

Answer 10

Lower subscapular nerve

Question 11

What is the action of teres major?

Answer 11

Adducts at the shoulder and medically rotates the arm