tmj, shoulder, brachial plexus

Question 1

what is the TMJ formed by

Answer 1

articulation between the temporal and mandibular bones

Question 2

TMJ joint type

Answer 2

synovial
condyloid / hinge
diarthrosis
uniaxial

Question 3

what are the articular surfaces of tmj

Answer 3

convex condyles of mandible
concave mandibular fossa
convex articular eminence of temporal bone

Question 4

accessory ligaments of TMJ

Answer 4

fibrous joint capsule
med and lat collateral ligaments
temporomandibular
stylomandibular
sphenomandibular

Question 5

moevemtns of TMJ

Answer 5

protraction / retraction
lateral deviation
depression (open)/ elevation (close)

Question 6

upper joint =

Answer 6

plane / gliding

Question 7

lower joint =

Answer 7

hinge / ginglymus

Question 8

unique feature of TMJ

Answer 8

the disc moves forward as the mouth opens

Question 9

as the mouth opens, rotation of the mandibular condyles occurs around the lower joint space

followed by translation of the articular disc on the upper joint space down to the articular eminence

Question 10

muscles of mastecation

Answer 10

masseter
lateral pterygoid (opens jaw)
medial pterygoid
temporalis (strongest)

other muscles
buccinator, SCM, digastric

Question 11

where is brachial plexus located

Answer 11

shoulder and armpit

formed by lower 4 cranial nerves and first thoracic nerve from spinal cord

Question 12

what are the cutaneous/sensory branches

Answer 12

lesser occipital
greater auricular
transverse cervical
supraclavicular

Question 13

what are the muscular/motor branches

Answer 13

ansa cervicalis
phrenic
segmental branches

Question 14

what order of the 5 divisions

Answer 14

roots, trunks, division, cords, terminal branches

Question 15

what is a plexus

Answer 15

a network of nerves that intersect and connect

composed of both sensory and motor fibers

Question 16

cervical plexus

Answer 16

formed by ventral rami of the upper four cervical nerves and part of the 5th cervical nerve from the spinal cord

located deep to SCM
contains sensory and motor nerves

innervates muscles of neck, skin of head, neck and chest

Question 17

what attaches to coracoid process

Answer 17

pec minor
coracobrachialis
short head of biceps brachii

Question 18

sternoclavicular type of joint

Answer 18

synovial
diarthrosis
saddle or plane
multiaxial

Question 19

sternoclavicular joint accessory ligaments

Answer 19

joint capsule
sternoclavicular
costoclavicular
interclavicular
articular disc

Question 20

movements of sternoclavicular joint

Answer 20

elevation/depression
protraction/retraction

Question 21

what is the only synovial joint that connects the upper extremity to the axial skeleton

Answer 21

interclavicular

Question 22

acromioclavicular joint type

Answer 22

synovial
diarthrosis
plane
triaxial

Question 23

acromioclavicular joint accessory ligaments

Answer 23

fibrous capsule
acromioclavicular ligament
coracoclavicular ligament (trapezoid, conoid)
coracoacromial ligament

Question 24

movements of acromioclavicular joint

Answer 24

elevation/depression
adduction/abduction
upward/downward rotation

Question 25

glenohumeral joint type

Answer 25

synovial ball and socket diarthrosis multiaxial

Question 26

glenohumeral joint accessory ligaments

Answer 26

superior, middle, inferior glenohumeral ligament (prevents anterior dislocation) coracohumeral transverse humeral (holds tendon of biceps in intertubercular groove)

Question 27

glenohumeral joint movements

Answer 27

flexion/extension adduction/abduction horizontal adduction/abduction medial/lateral rotation circumduction

Question 28

movements of scapulothoracic joint

Answer 28

sliding protraction/retraction elevation/depression upward/downward rotation of glenoid fossa

Question 29

functions of scapulothoracic joint (5)

Answer 29

increase shoulder ROM maintain length-tension relationship with deltoid provide GH stability injury prevention through shock absorption permit elevation of body

Question 30

3 structures in subacromial space

Answer 30

supraspinatus tendon long head biceps tendon subacromial bursa

Question 31

actions of the pec as a whole

Answer 31

horizontal adduction medial rotation of humerus

Question 32

action of subclavius

Answer 32

pulls shoulder forward and downward stabilizes it

Question 33

O's and I's of subclavious

Answer 33

O: first costal cartilage I: acromial end of clavicle N:nerve to subclavius

Question 34

action of the deltoid

Answer 34

abduction of shoulder joint anterior fibers flex and medially rotate while posterior fibers extend and laterally rotate shoulder joint

Question 35

what does the deltoid fibers insert into

Answer 35

deltoid tuberosity of humerus

Question 36

what does the anterior fibers of the deltoid originate

Answer 36

clavicle

Question 37

where do middle fibers of deltoid originate

Answer 37

acromion

Question 38

where do posterior fibers originate

Answer 38

spine of scapula

Question 39

action of supraspinatus

Answer 39

abducts and laterally rotates shoulder joint stabilize head of humerus in glenoid cavity

Question 40

O'S and I's of supraspinatus

Answer 40

O: 2/3 of supraspinatus fossa I: superior facet of greater tubercle of humerus

Question 41

what 2 muscles share suprascapular nerve

Answer 41

infra/supraspinatus

Question 42

what muscles share axillary nerve

Answer 42

teres minor deltoid

Question 43

action of infraspinatus

Answer 43

laterally rotate shoulder joint stabilize head of humerus in glenoid cavity

Question 44

O's and I's of infraspinatus

Answer 44

O: infraspinatus fossa I: greater tubercle of humerus/shoulder joint capsule

Question 45

O's and I's of teres minor

Answer 45

O: dorsal surface of lateral border of scapula I: inferior facet of greater tubercle of humerus

Question 46

action of teres minor

Answer 46

laterally rotates shoulder joint and stabilizes head of humerus

Question 47

which 3 muscles of rotator cuff laterally rotate shoulder joint

Answer 47

teres minor supraspinatus infraspinatus

Question 48

which muscle of rotator cuff medially rotates shoulder joint

Answer 48

subscapularis

Question 49

O's and I's of subscapularis

Answer 49

O: subscapular fossa of scapula I: lesser tubercle of humerus

Question 50

what does the rotator cuff do as a whole

Answer 50

stabilize head of humerus in glenoid cavity

Question 51

nerve of subscapularis

Answer 51

upper and lower subscapular nerve

Question 52

action of teres major

Answer 52

medially rotates adducts / extends shoulder joint

Question 53

O's and I's of teres major

Answer 53

O:inferior angle and lateral border of scapula I: crest of lesser tubercle of humerus

Question 54

which muscles insert at lesser tubercle of humerus

Answer 54

teres major subscapularis

Question 55

what inserts at inferior facet

Answer 55

teres minor