Extrinsic Back Muscles

Question 1

name the extrinsic back muscles

Answer 1

trapezius
latissimus dorsi
rhomboid major
rhomboid minor
levator scapulae

Question 2

what is the origin of the trapezius

Answer 2

superior nuchal line
spinous process of cervical vertebrae
spinous process of thoracic vertebrae

Question 3

what is the insertion point of the trapezius

Answer 3

acromion process of scapula
spine of scapula
anterior aspect of clavicle

Question 4

what nerve supplies the trapezius? what information is provided by each?

Answer 4

Cranial Nerve XI (motor)
Cranial Nerve 3&4 (sensory)

Question 5

what is the arterial supply of the trapezius?

Answer 5

superficial branch of transverse cervical artery

Question 6

what action does the upper trapezius perform?

Answer 6

elevation of scapula
retraction of glenoid fossa superiorly
retraction of scapula
lateral flexion

Question 7

what action does the middle division of the trapezius do?

Answer 7

retraction of scapula

Question 8

what action does the lower division of the trapezius do?

Answer 8

depression of scapula
rotation of scapula

Question 9

what is the origin of the latissimus dorsi?

Answer 9

spinous process of TV6-LV5
iliac cress
via thoracolumbar fascia

Question 10

what is the insertion of the latissimus dorsi?

Answer 10

intertubercular groove of humerus

Question 11

what is the arterial supply of the latissimus dorsi?

Answer 11

thoracodorsal branch of subscapular artery

Question 12

what is the nerve supply of latissimus dorsi? which cranial nerves are categorized?

Answer 12

thoracodorsal nerve
C6,7,8

Question 13

what is the action performed by the latissimus dorsi?

Answer 13

extension of humerus
internal rotation of humerus
adduction of humerus

Question 14

what is the origin of the rhomboid major?

Answer 14

spinous processes of TV2 through TV5

Question 15

what is the insertion of the rhomboid major?

Answer 15

medial border of scapula inferior to spine

Question 16

what is the origin of the rhomboid minor?

Answer 16

spinous processes of CV7 through TV1

Question 17

what is the insertion of rhomboid minor?

Answer 17

medial border of scapula at level of spine

Question 18

what is the nerve supply to the rhomboids? what cranial nerve is that?

Answer 18

dorsal scapular
C5

Question 19

what is the arterial supply of the rhomboids?

Answer 19

transverse cervical artery deep branch

Question 20

what actions do the rhomboids do?

Answer 20

retraction of scapula
rotation of scapula to depress glenoid fossa

Question 21

what is the origin of the levator scapula?

Answer 21

transverse process of CV1 through 4

Question 22

what is the insertion of the levator scapulae?

Answer 22

medial border of scapula above spine

Question 23

what is the nerve supply of the levator scapulae?

Answer 23

C3, C4, and dorsal scapular (C5)

Question 24

what is the arterial supply of the levator scapulae?

Answer 24

transverse cervical artery deep branch

Question 25

what is the action of the levator scapulae?

Answer 25

elevation of scapula

Question 26

what about the levator scapulae and rhomboids are similar?

Answer 26

arterial supply - transverse cervical deep branch
insertion at medial border of scapula (levator = superior to spine, rhomboids = @ spine / inferior to spine)