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MSA > tmj, shoulder, brachial plexus > Flashcards

tmj, shoulder, brachial plexus Flashcards

1
Q

what is the TMJ formed by

A

articulation between the temporal and mandibular bones

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2
Q

TMJ joint type

A

synovial
condyloid / hinge
diarthrosis
uniaxial

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3
Q

what are the articular surfaces of tmj

A

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

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4
Q

accessory ligaments of TMJ

A

fibrous joint capsule
med and lat collateral ligaments
temporomandibular
stylomandibular
sphenomandibular

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5
Q

moevemtns of TMJ

A

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

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6
Q

upper joint =

A

plane / gliding

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7
Q

lower joint =

A

hinge / ginglymus

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8
Q

unique feature of TMJ

A

the disc moves forward as the mouth opens

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9
Q

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

A
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10
Q

muscles of mastecation

A

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

other muscles
buccinator, SCM, digastric

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11
Q

where is brachial plexus located

A

shoulder and armpit

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

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12
Q

what are the cutaneous/sensory branches

A

lesser occipital
greater auricular
transverse cervical
supraclavicular

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13
Q

what are the muscular/motor branches

A

ansa cervicalis
phrenic
segmental branches

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14
Q

what order of the 5 divisions

A

roots, trunks, division, cords, terminal branches

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15
Q

what is a plexus

A

a network of nerves that intersect and connect

composed of both sensory and motor fibers

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16
Q

cervical plexus

A

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

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17
Q

what attaches to coracoid process

A

pec minor
coracobrachialis
short head of biceps brachii

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18
Q

sternoclavicular type of joint

A

synovial
diarthrosis
saddle or plane
multiaxial

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19
Q

sternoclavicular joint accessory ligaments

A

joint capsule
sternoclavicular
costoclavicular
interclavicular
articular disc

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20
Q

movements of sternoclavicular joint

A

elevation/depression
protraction/retraction

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21
Q

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

A

interclavicular

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22
Q

acromioclavicular joint type

A

synovial
diarthrosis
plane
triaxial

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23
Q

acromioclavicular joint accessory ligaments

A

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

24
Q

movements of acromioclavicular joint

A

elevation/depression
adduction/abduction
upward/downward rotation

25
Q

glenohumeral joint type

A

synovial
ball and socket
diarthrosis
multiaxial

26
Q

glenohumeral joint accessory ligaments

A

superior, middle, inferior glenohumeral ligament (prevents anterior dislocation)

coracohumeral

transverse humeral (holds tendon of biceps in intertubercular groove)

27
Q

glenohumeral joint movements

A

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

28
Q

movements of scapulothoracic joint

A

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

29
Q

functions of scapulothoracic joint (5)

A

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

30
Q

3 structures in subacromial space

A

supraspinatus tendon
long head biceps tendon
subacromial bursa

31
Q

actions of the pec as a whole

A

horizontal adduction
medial rotation of humerus

32
Q

action of subclavius

A

pulls shoulder forward and downward stabilizes it

33
Q

O’s and I’s of subclavious

A

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

34
Q

action of the deltoid

A

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

35
Q

what does the deltoid fibers insert into

A

deltoid tuberosity of humerus

36
Q

what does the anterior fibers of the deltoid originate

A

clavicle

37
Q

where do middle fibers of deltoid originate

A

acromion

38
Q

where do posterior fibers originate

A

spine of scapula

39
Q

action of supraspinatus

A

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

40
Q

O’S and I’s of supraspinatus

A

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

41
Q

what 2 muscles share suprascapular nerve

A

infra/supraspinatus

42
Q

what muscles share axillary nerve

A

teres minor
deltoid

43
Q

action of infraspinatus

A

laterally rotate shoulder joint
stabilize head of humerus in glenoid cavity

44
Q

O’s and I’s of infraspinatus

A

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

45
Q

O’s and I’s of teres minor

A

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

46
Q

action of teres minor

A

laterally rotates shoulder joint and stabilizes head of humerus

47
Q

which 3 muscles of rotator cuff laterally rotate shoulder joint

A

teres minor
supraspinatus
infraspinatus

48
Q

which muscle of rotator cuff medially rotates shoulder joint

A

subscapularis

49
Q

O’s and I’s of subscapularis

A

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

50
Q

what does the rotator cuff do as a whole

A

stabilize head of humerus in glenoid cavity

51
Q

nerve of subscapularis

A

upper and lower subscapular nerve

52
Q

action of teres major

A

medially rotates
adducts / extends shoulder joint

53
Q

O’s and I’s of teres major

A

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

54
Q

which muscles insert at lesser tubercle of humerus

A

teres major
subscapularis

55
Q

what inserts at inferior facet

A

teres minor

56
Q
A

MSA (8 decks)

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