Muscles Connecting Trunk to UE (axio-appendicular)

Question 1

Proximal–> distal attachment of latissimus dorsi

Answer 1

Lower thoracic spinous processes, thoracolumbar fascia, iliac crest TO floor of the inter tubercular sulcus of the humerus

Question 2

Innervation of latissimus dorsi

Answer 2

thoracodorsal nerve (C6, C7, C8)

Question 3

Proximal–>distal attachments of levator scapulae

Answer 3

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

Question 4

Innervation of levator scapulae

Answer 4

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

C4-C5

Question 5

Actions of latissimus dorsi

Answer 5

adduction, extension, and medial rotation of humerus

Question 6

actions of levator scapulae

Answer 6

elevation and downward rotation of scapula

Question 7

proximal attachment–>distal attachment pectoralis major

Answer 7

from clavicle, costal cartilages, sternum, and aponeurosis of the external oblique TO the lateral lip of the intertubercular sulcus of the humerus

Question 8

Action of pectoralis major

Answer 8

humeral adduction, flexion, and medial rotation, (sternocostal portion assists with extension of the flexed arm)

Question 9

Innervation of the pectoralis major

Answer 9

medial and lateral pectoral nerves

clavicular head: C5-C6; sternocostal head C7- T1

Question 10

Proximal–>distal attachment of pectoralis minor

Answer 10

outer surfaces of ribs 3-5 TO the coracoid process

Question 11

Action of Pectoralis Minor

Answer 11

anterior tilt of scapula, depression of shoulder, forced inspiration

Question 12

Innervation of pectoralis minor

Answer 12

medial and lateral pectoral nerves (same as major)

C5-T1

Question 13

Proximal–>distal attachments of the rhomboids

Answer 13

major: spinous processes T2-T5 minor: ligamentum nuchae and spinous processes C7-T1 TO the medial border of the scapula

Question 14

Actions of the rhomboids

Answer 14

scapular retraction, elevation, and downward rotation

Question 15

Innervation of the rhomboids

Answer 15

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

C4-C5

Question 16

Proximal–>distal attachments of serratus anterior

Answer 16

outer surfaces and superior borders of upper 8-10 ribs TO the costal surface of the medial border of the scapula

Question 17

Actions of serratus anterior

Answer 17

shoulder protraction and upward rotation

Question 18

Innervation of serratus anterior

Answer 18

long thoracic nerve

C5-7

Question 19

Proximal–>distal attachments of subclavius

Answer 19

first rib and cartilage TO the undersurface of the clavicle

Question 20

Actions of subclavius

Answer 20

depresses and stabilizes the clavicle

Question 21

Innervation of subclavius

Answer 21

subclavian nerve

C5-C6

Question 22

Proximal–>distal attachments of trapezius

Answer 22

superior nuchal line, external occipital protuberance, ligamentum nuchae, and cervical and thoracic spinous processes TO clavicle, acromion, and crest of the scapular spine

Question 23

Actions of the trapezius

Answer 23

upper- scapular elevation
lower-depression of scapula
middle-retraction
upper/lower- upward and downward rotation of scapula

Question 24

Innervation of the trapezius

Answer 24

spinal accessory nerve (CN XI; motor), and C3-C4 (sensory)

Question 25

spinal cord segments of latissimus dorsi

Answer 25

C6- C8

Question 26

spinal cord segments of levator scapulae

Answer 26

C4- C5

Question 27

spinal cord segments of pectoralis major

Answer 27

clavicular head - C5-C6

sternocostal head- C7- T1

Question 28

spinal cord segments of pectoralis minor

Answer 28

C5-T1

Question 29

spinal cord segments of rhomboids

Answer 29

C4-5

Question 30

spinal cord segments of serratus anterior

Answer 30

C5- C7

Question 31

spinal cord segments of subclavius

Answer 31

C5-6

Question 32

spinal cord segments of trapezius

Answer 32

sensory segments: C3-4

–> cranial nerve: spinal accessory nerve CN XI