Biomechanics Upper Extremities

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created 5 years ago by hoovemaa
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1

scapular elevators

levator scapulae

trapezius

rhomboids

2

scapular depressors

pec minor

trapezius

3

scapular protractors

serratus anterior

pec minor

4

scapular retractors

trapezius

rhomboids

5

scapular upward rotators

serratus anterior

trapezius

6

scapular downward rotators

rhomboids

levator scapulae

7

shoulder flexors and horizontal adductors

anterior delt

pec major

8

shoulder extensors and horizontal abductors

latissimus dorsi

posterior deltoid

9

shoulder abductors

entire deltoid

supraspinatus

10

shoulder adductors

latissimus dorsi

pec major

11

shoulder internal rotators

anterior deltoid

latissimus dorsi

subscapularis

12

shoulder external rotators

deltoid posterior

infraspinatus

teres minor

13

muscles of the rotator cuff

supraspinatus

infraspinatus

teres minor

subscapularis

14

what do muscles of the rotator cuff do?

provide most of dynamic stability at the shoulder

15

tightness of upper cross syndrome

neck extensors

chest muscles (pec maj/min)

shoulder internal rotators

16

weakness of upper cross syndrome

shoulder external rotators

scapular depressors

scapular upward rotators

deep neck flexors

17

causes of shoulder impingement

compression of rotator cuff tendons in subacromial space

superior translation of humerus caused by certain movements and lack of GH stability

OR

improper position and/or stabilization of the scapula

18

consequences of shoulder impingement

pain and chronic damage to rotator cuff tendons, bursae, and other stuff

pain can lead to weakening and dysfunction

19

elbow flexors

biceps brachii

brachialis

brachioradialis

20

which side of the forearm is the brachioradialis located?

thumb side of forearm

21

bicep brachii

large CSA

good mechanical advantage

best in supination

22

brachialis

attaches to ulna

largest CSA, smallest mechanical advantage

not affected by pro/supination

23

brachioradialis

attaches to lateral radius

smallest CSA, good mechanical advantage

best in semiprone position

24

elbow extensors

tricep brachialis

long, lateral, medial heads

25

how does the shape of the olecranon effect tricep moment arm?

it changes with the joint angle

moment arm is greatest near extension

26

valgus deviation

lateral deviation from plane of movement

27

vagus deviation

medial deviation from plane of movement

28

what does excesive valgus torque lead to?

traumatic injury of UCL