Superficial Back Muscle Structure Info

Question 1

latissimus dorsi s.c. segment

Answer 1

C6-8

Question 2

latissimus dorsi attachments

Answer 2

from lower thoracic spinous processes, thoracolumbar fascia and iliac crest to the floor of the intertubercular sulcus of humerus

Question 3

latissimus dorsi actions

Answer 3

adduction, extension, and medial rotation of humerus

Question 4

latissimus dorsi innervation

Answer 4

thoracodorsal nerve

Question 5

levator scapulae s.c. segment

Answer 5

C4-5

Question 6

levator scapulae attachments

Answer 6

from transverse processes of C1-C4 to superior angle and superomedial border of scapula

Question 7

levator scapulae actions

Answer 7

elevation and downward rotation of scapula

Question 8

levator scapulae innervation

Answer 8

dorsal scapular nerve
(sensory: direct branches of C3-4)

Question 9

rhomboids s.c. segment

Answer 9

C4-5

Question 10

rhomboids attachments

Answer 10

-major: from spinous processes T2-5
-minor: from ligamentum nuchae and spinous processes C7-T1 to medial border of scapula

Question 11

serratus anterior s.c. segment

Answer 11

C5-7

Question 12

serratus anterior attachments

Answer 12

from the outer surfaces and superior borders of upper eight-ten ribs to the costal surface of the medial border of scapula

Question 13

serratus anterior actions

Answer 13

scapular protraction and upward rotation

Question 14

serratus anterior innervation

Answer 14

long thoracic nerve

Question 15

subclavius s.c. segment

Answer 15

C5-6

Question 16

subclavius attachments

Answer 16

from first rib and cartilage to the undersurface of clavicle

Question 17

subclavius actions

Answer 17

depresses and stabilizes clavicle

Question 18

subclavius innervation

Answer 18

subclavian nerve

Question 19

trapezius s.c. segment

Answer 19

-accessory n. [CN XI] motor
-C3-4 sensory

Question 20

trapezius attachments

Answer 20

-from superior nuchal line, external occipital protuberance, ligamentum nuchae, and cervical and thoracic spinous processes to clavicle, acromion, and scapular spine

Question 21

trapezius actions

Answer 21

-scapular elevation (upper)
-depression (lower)
-retraction (middle)
-upward rotation (upper and lower)

Question 22

trapezius innervation

Answer 22

-accessory nerve [CN XI], motor
-C3-4, sensory

Question 23

rhomboids actions

Answer 23

-scapular retraction
-elevation (upper)
-downward rotation of scapula

Question 24

rhomboids innervation

Answer 24

-dorsal scapular nerve
-sensory: direct branches of C3-4