Superficial (appendicular) Back Muscles

Question 1

Origin of trapezius

Answer 1

• superior nuchal line
• external occipital protuberance
• ligamentum nuchae
• Spinous process C7-T12

Question 2

Insertion of trapezius

Answer 2

• spine of scapula
• acromion
• lateral 1/3 of clavicle

Question 3

What are the parts of the trapezius

Answer 3

• descending part
• transverse part
• ascending part

Question 4

Origin and insertion of descending trapezius

Answer 4

O: occipital protuberance, sup. nuchal line, C7 spinous process

I: lat. 1/3 clavicle, acromion

Question 5

Origin and insertion of transverse trapezius

Answer 5

O: C7-T4 spinous process

I: acromion, medial half of spine of scapula

Question 6

Origin and insertion of ascending trapezius

Answer 6

O: T5-T12 spinous process

I: Spine of scapula

Question 7

What innervates the trapezius

Answer 7

• accessory nerviest (CN 11)

- C3/C4

Question 8

Origin of latissimus dorsi

Answer 8

• T7-L5 spinous process (& sacrum)
• iliac crest
• ribs 10-12

Question 9

What is the insertion of latissimus dorsi?

Answer 9

• floor of intertubercular sulcus of humerus

Question 10

What innervates the latissimus dorsi?

Answer 10

• Thoracodorsal nerve (C6,7,8)

Question 11

What supplies the latissimus dorsi?

Answer 11

• Thoracodorsal artery (main)

- small branches from dorsal (post.) branches of posterior intercostal & lumbar arteries

Question 12

What supplies the trapezius?

Answer 12

• superficial branch of transverse cervical artery
• acromial branch of suprascapular artery
• dorsal branches of posterior intercostal artery

[3 PARTS = 3 SUPPLIES]

Question 13

What is the origin of levator scapulae?

Answer 13

• C1-C4 transverse process

Question 14

What is the insertion of levator scapulae?

Answer 14

• medial border of scapula / superior to spine

Question 15

What innervates the levator scapulae?

Answer 15

• C3-C4

- dorsal scapular nerve (C4-C5)

Question 16

What supplies the levator scapulae?

Answer 16

• transverse & ascending cervical artery

Question 17

Origin of rhomboid major

Answer 17

• T2-T5 spinous processes

Question 18

Insertion of rhomboid major

Answer 18

• medial border of scapula

B/w spine of scapula & inf. angle

Question 19

What innervates rhomboid major

Answer 19

• Dorsal scapula nerve (C4-C5)

Question 20

What supplies rhomboid major

Answer 20

• dorsal scapular artery

Question 21

Origin of rhomboid minor

Answer 21

• Lower portion ligamentum nuchae

- C7-T1 spinous process

Question 22

Insertion of rhomboid minor

Answer 22

• medial border of scapula

At spine of scapula

Question 23

Innervation of rhomboid minor

Answer 23

• dorsal scapula nerve (C4-C5)

Question 24

What supplies the rhomboid minor

Answer 24

• dorsal scapular artery

Question 25

List all the superficial (appendicular/extrinsic) muscles of the back

Answer 25

1. Trapezius
2. Latissimus dorsi
3. Levator scapulae
4. Rhomboid major
5. Rhomboid minor