Back/Pectoral Region/Rotator Cuffs Flashcards Preview

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Flashcards in Back/Pectoral Region/Rotator Cuffs Deck (27):
1

name the superficial back muscles

trapezius, lattissimus dorsi, levator scapulae + rhomboids (major and minor)

2

which muscles are involved in arm abduction?

supraspinatus (5-15 degrees), deltoid (up to 90), trapezius

3

what is the action and innervation of the trapezius?

accessory nerve.
upper fibres = abduction of arm
middle fibres = retract scapula
lower fibres = pull scapula inferiorly

4

what is the action and innervation of the lattissimus dorsi?

thoracodorsal nerve.
extends, adducts + medially rotates upper limb

5

what is the action and innervation of levator scapulae?

dorsal scapular nerve
elevates scapula

6

what muscle does the thoracodorsal nerve innervate?

lattissimus dorsi

7

what does the dorsal scapular nerve innervate?

levator scapulae and both rhomboids

8

which is superior, rhomboid major or minor?

minor

9

what is the action and innervation of rhomboid major/minor?

dorsal scapular nerve
retracts + rotates scapula

10

which wall of the axilla do the pec major/minor muscles contribute to?

anterior

11

what are the two heads of pectoralis major, and where do they insert to?

clavicular and sternocostal
both insert together in the bicipital groove

12

what is the action and innervation of pectoralis major?

adduct and medially rotate arm (clavicular head also flexes)
medial + lateral pectoral nerves

13

what is the action and innervation of pectoralis minor?

medial pectoral nerve
depresses shoulder

14

to which wall of the axilla does the serratus anterior contribute?

medial

15

what is the action and innervation of serratus anterior?

long thoracic nerve
rotates scapula, allowing arm to be raised over 90 degrees

16

what does the long thoracic nerve supply?

serratus anterior

17

name the 6 intrinsic shoulder muscles?

deltoid + teres major, plus the 4 rotator cuff muscles:
supraspinatus, infraspinatus, subscapularis + teres major

18

what is the action and innervation of the deltoids?

axillary nerve
anterior fibres flex arm @ shoulder
middle fibres - major arm abductor (5-90 degrees)
posterior fibres - extend arm @ shoulder

19

what is the action and innervation of teres major?

lower subscapular nerve
adducts @ shoulder + medially rotates the arm

20

which of teres major/minor is a rotator cuff muscle?

minor

21

what are the 4 rotator cuff muscles?

supraspinatus, infraspinatus, subscapularis + teres minor

22

what is the main action of the rotator cuff muscles?

hold humeral head in the glenoid fossa, stabilising the joint

23

what is the action and innervation of supraspinatus?

suprascapular nerve
abduction 0-5 degrees, and assists deltoids for 5-90 degrees

24

what is the action and innervation of infraspinatus?

suprascapular nerve
lateral rotation of arm

25

which two muscles does the suprascapular nerve innervate?

supraspinatus and infraspinatus

26

what is the action and innervation of subscapularis?

upper and lower subscapular nerve
medially rotates arm

27

what is the action and innervation of teres minor?

axillary nerve
laterally rotates arm