Muscles of the shoulder

Question 1

What movement does the trapezius do?

Answer 1

Rotates the scapula during abduction of the humerus above horizontal

Question 2

What movement does the lattisimus dorsi do?

Answer 2

Extends, adducts and medially rotates the shoulder.

Raises body towards the arm when climbing

M-REAd

Question 3

What movement does the levator scapulae do?

Answer 3

Elevates and rotates the scapula medially

Question 4

What movement does the rhomboid major and minor do?

Answer 4

Retracts scapula medially and superiorly.

Used in squaring shoulders

Question 5

What movement does the Serratus Anterior do?

Answer 5

Protracts scapula.
Rotates scapula laterally
Holds scapular flat against thoracic wall

Question 6

What nerve innervates the trapezius?

Answer 6

accessory CN11

Question 7

what nerve innervates Lat Dorsi

Answer 7

Thoracodorsal nerve (C6-8)

Question 8

What nerve innervates Serratus Anterior

Answer 8

Long thoracic nerve (C5-7)

Question 9

What movement is Deltoid responsible for?

Answer 9

Abduction of the arm.

Gives shoulder a rounded appearance

Question 10

What nerve innervates Deltoid?

Answer 10

Axillary

Question 11

What movement does Teres Major do

Answer 11

Adduction

Medially rotates the humerus

Question 12

What nerve innervates teres Major

Answer 12

Lower subscapular nerve (C5-C6)

Question 13

What are the 4 rotator cuff muscles

Answer 13

Supraspinatus
Infraspinatus
Teres Minor
Subscapularis

Question 14

What movement does supraspinatus do?

Answer 14

Initiates first 15 degrees of abduction

Question 15

What movement does infraspinatus do?

Answer 15

laterally rotates humerus

Stabilises glenohumeral joint

Question 16

What movement does teres Minor do?

Answer 16

Laterally rotates and adducts the humerus

Question 17

What movement does subscapularis do?

Answer 17

Medially rotates and adducts the humerus

Question 18

What nerve innervates Teres Minor

Answer 18

Axillary

Same as deltoid

Question 19

What nerve innervates Subscapularis

Answer 19

Subscapular nerve

Question 20

Where do Pec major, Lat Dorsi + Teres Major attach to?

Answer 20

Intertubercular sulcus of the humerus

Question 21

What muscle attaches to the medial surface of the humerus?

Answer 21

Coracobrachialis

Question 22

What nerve can be damaged by the fracture of the surgical neck of the humerus?

How could you test for this?

Answer 22

Axillary nerve and posterior humeral circumflex would be damaged.

Axillary nerve innervates Teres Minor and Deltoid - patient won’t be able to abduct shoulder past 15 degrees. Won’t be able to laterally rotate.