Muscles Of The Back

Question 1

What nerve supplies the trapezius muscle and what are the nerve roots?

Answer 1

Accessory nerve, C3,4

Question 2

On what spinous processes does the trapezius muscle originate?

Answer 2

C7-T12

Question 3

Where does the trapezius muscle insert?

Answer 3

Superior part of crest of spine of scapula, acromion and lateral 1/3 of posterior clavicle.

Question 4

What function does the trapezius muscle has?

Answer 4

Movement of the scapula:

Superior - elevates, middle - retracts, inferior - depresses.

Question 5

What is the function of the rhomboid muscles?

Answer 5

Elevation and retraction of scapula

Question 6

What nerve innervates the rhomboid muscles?

Answer 6

Dorsal scapula nerve, C4,5

Question 7

What spinous processes do the rhomboid muscles originate from?

Answer 7

T2-T5

Question 8

Which rhomboid muscle inserts onto the scapula at the root of the spine?

Answer 8

Minor

Question 9

Where does rhomboid major insert?

Answer 9

Onto the posterior of the medial border of the scapula between the root of spine and inferior angle.

Question 10

What nerves innervate th levator scapulae?

Answer 10

C3,c4 and branch from dorsal scapula nerve.

Question 11

Where on the scapula does levator scapulae insert?

Answer 11

Medial border on the posterior between the root of spine and superior angle.

Question 12

What is the function of levator scapulae?

Answer 12

Elevation of the scapula.

Question 13

Name two muscles innervated by the axillary nerve.

Answer 13

Teres minor and deltoid.

Question 14

Where does the deltoid muscle insert?

Answer 14

Deltoid tuberosity.

Question 15

Where does the deltoid muscle originate?

Answer 15

Inferior edge of crest of spine of scapula, lateral margin of acromion and anterior border of lateral 1/3 of Clavicle.

Question 16

What functions does the deltoid muscle perform?

Answer 16

Abduction of the arm, clavicular fibres flex, posterior fibres extend.

Question 17

What nerve innervates the latissimus dorsi muscle?

Answer 17

Thoracodorsal nerve C6-C8.

Question 18

Where on the humerus does latissimus dorsi insert?

Answer 18

Floor of the Intertubecular sulcus.

Question 19

What are the functions of latissimus dorsi?

Answer 19

It extends, Medially rotates and adducts the arm.

Question 20

What are the four rotator cuff muscles and what is their function?

Answer 20

Subscapularis, supraspinatous, infraspinatous and teres minor. Stabilise the shoulder joint.

Question 21

What muscles are innervated by the supra scapular nerve?

Answer 21

Supraspinatous and infraspinatous. It’s roots are C4,5,6

Question 22

Where does supraspinatous insert on the humerus?

Answer 22

It inserts onto the superior facet on greater tubercle.

Question 23

Where does infraspinatous insert on humerus?

Answer 23

Middle facet of greater tubercle.

Question 24

What is the function of infraspinatous?

Answer 24

Lateral rotation of the arm

Question 25

Where does teres minor insert on the humerus?

Answer 25

Inferior facet of the greater tubercle.

Question 26

Where does teres minor originate on the scapula?

Answer 26

Middle part of lateral border of scapula.

Question 27

What is the innervation of teres major?

Answer 27

Lower subscapular nerve (c5,6)

Question 28

What is the function of teres major and how does its insertion help this?

Answer 28

It adducts and Medially rotates the arm. It inserts on the medial lip of the Intertubecular groove which means it attached on the front of the humerus.

Question 29

Where does subscapularis insert?

Answer 29

Lesser tubercle of humerus.

Question 30

What nerve inervates subscapularis?

Answer 30

Upper and lower subscapular nerves (C5,6,7)

Question 31

Where does teres major originate from on the scapula?

Answer 31

Posterior surface of inferior spine.

Question 32

I what movement is rotation of the scapula necessary?

Answer 32

Abduction of the arm above 90degrees.