Extrinsic Musculature of the Back

Question 1

superficial back muscles

Answer 1

trapezius
latissimus dorsi
levator scapulae
rhomboid major
rhomboid minor

Question 2

list origin and insertion of trapezius

Answer 2

O - ligamentum nuchae, spinous process of CVII to TXII, superior nuchal line
I - lateral 1/3 clavicle, acromion and spine of scapula

Question 3

list innervation of trapezius

Answer 3

accessory nerve

C3, C4 for proprioception

Question 4

action of trapezius

Answer 4

rotation of scapula during abduction
elevate or depress scapula
middle fibres adduct scapula

Question 5

origin and insertion of latissimus dorsi

Answer 5

O - spinous process of TVII to LV and sacrum, iliac crest and ribs 10 -12
I - intertubercular sulcus of humerus

Question 6

innervation of latissimus dorsi

Answer 6

thoracodorsal nerve

Question 7

action of latissimus dorsi

Answer 7

extension
adduction
medial rotation

Question 8

origin and insertion of levator scapulae

Answer 8

O - transverse process of CI to CIV

I - medial border of scapula

Question 9

origin and insertion of rhomboid major

Answer 9

O - spinous process of TII-TV

I - medial border of scapula to inferior angle of scapula

Question 10

innervation of levator scapulae

Answer 10

dorsal scapular nerve

Question 11

action of levator scapular

Answer 11

elevate scapula

Question 12

innervation of rhomboid major

Answer 12

dorsal scapular nerve

Question 13

action of rhomboid major

Answer 13

scapula retraction and elevation

Question 14

origin and insertion of rhomboid minor

Answer 14

O - lower of ligamentum nuchae, spinous process of CVII to TI
I - medial border of scapula

Question 15

innervation of rhomboid minor

Answer 15

dorsal scapular nerve

Question 16

action of rhomboid minor

Answer 16

scapula retraction and elevation

Question 17

intermediate respiratory muscles

Answer 17

serratus posterior superior

serratus posterior inferior

Question 18

list origin and insertion of serratus posterior superior

Answer 18

O - lower of ligamentum nuchae, spinous process of CVII to TIII
I - upper border of ribs 2 to 5

Question 19

innervation of serratus posterior superior

Answer 19

anterior of upper thoracic nerves

Question 20

action of serratus posterior superior

Answer 20

elevate ribs 2 to 5

Question 21

origin and insertion serratus posterior inferior

Answer 21

O - spinous process of TXI to LIII

I - lower border of ribs 9 to 12

Question 22

innervation of serratus posterior inferior

Answer 22

anterior rami of lower thoracic nerves

Question 23

action of serratus posterior inferior

Answer 23

depress ribs 9 to 12