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Exam 3- Anatomy > Muscles of the Back > Flashcards

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1

list the superficial muscles of back (intermediate included)

(7)

trapezius, latissimus doors, levator scapulae, rhomboid major, rhomboid minor (serratus posterior superior and inferior)

2

muscles of the back that move the limbs and are innervated by the CN1 or branches of the brachial plexus

extrinsic muscles

3

are extrinsic or intrinsic back muscles hypaxial?

extrinsic

epaxial are intrinsic

4

intrinsic muscles

support upright posture and allow movements of vertebral column

involved in proprioception, innervated by dorsal rami of spinal nerves

5

posterior appendicular muscles

posterior muscles that attach the scapula and humerus to axial skeleton or scapula to humerus
includes the superficial and intermediate muscles of back

6

Proximal attachment of trapezius
(origin)

external occipital protuberance of skull, nuchal ligament, spinous process of C7-T12 vertebrae

7

Distal attachment of trapezius (insertion)

lateral third of clavicle (anterior), acromion, spine of scapula (posterior)

8

actions of trapezius (3)

1. elevation and upward rotation of scapula -- rotates glenoid fossa superiorly
2. retracts scapula
3. depression and upward rotation of scapula

9

innervation of trapezius

motor: accessory nerve
sensory: ventral rami of C3 and C4

10

proximal attachment of Latissimus dorsi

spinous process of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, inferior 3 ribs

11

distal attachment of Latissimus dorsi

floor of inter tubercular sulcus of humerus

12

actions of Latissimus dorsi

extends, adducts, and medially rotates humerus
raises torso towards arms during climbing

13

innervation of Latissimus dorsi

throacodorsal nerves

14

main action of the Latissimus dorsi

moves the humerus at the shoulder (glenohumeral) joint

15

main action of the trapezius

moves the scapula

16

proximal attachment of rhomboid major

spinous processes of T2-T5

17

distal attachment of rhomboid major

medial border scapula from level of spine to inferior

18

actions of rhomboids

retract, elevate, rotate scapula downward (fix it to thoracic wall)

19

innervations of the rhomboids

dorsal scapular nerve

20

proximal attachment of rhomboid minor

nuchal ligament, spinous process of C7 and T1

21

distal attachment of rhomboid minor

medial end of scapular spine

22

proximal attachment of Levator scapulae

posterior tubercle of transverse process of first 4 cervical vertebrae

23

distal attachment of Levator scapulae

medial border of scapula
superior part of scapular spine

24

actions of Levator scapulae

elevates scapula and tilts glenoid fossa inferiorly by rotating scapula

25

innervation of Levator scapulae

dorsal scapular nerve and ventral rami of cervical spinal nerves

26

proximal attachment of serratus posterior superior

nuchal ligament, spinous processes of C7-T3 vertebrae

27

distal attachment of serratus posterior superior

superior border of ribs 2-4

28

actions of serratus posterior superior

elevates ribs

29

innervation of serratus posterior superior

ventral rami of T2-5 intercostal nerves

30

proximal attachment of serratus posterior inferior

spinous process of T11-L2 vertebrae