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Anatomy 315 > lecture 8: pectoral girdle > Flashcards

lecture 8: pectoral girdle Flashcards

1
Q

what are the 2 main bones of the pectoral girdle

A

clavicle
scapula

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2
Q

is the pcetoral girdle closed?

A

no it is open posterioly
the scapula can move freely

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3
Q

what is the meedial end of the clavicle

A

the sternal end

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4
Q

whatt is the lateral end of the clavicle

A

the acromial end

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5
Q

what does the medial end of the clav ariculae with

A

the sternum

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6
Q

what doees the latreal end of the clav articulate with

A

acromion proceess

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7
Q

know the aspects of the clavicle

A

sternal end
acromiinal end
grooev for subclavius
conoid tubercle

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8
Q

what is the groove on the clavicle for

A

the subclavius muscle

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9
Q

know how to oritent a clavicle

A

sub clav groove downwards
long convex medially and shorter concavity laterally

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10
Q

what are the 3 borders and angles of the scapula

A

borders: medial, superior and lateral
angles: inferior, superior and lateral

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11
Q

what is the most lateral aspect of the scapula

A

Acromion process

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12
Q

what type of bone is the scapula

A

irregular bone

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13
Q

what are the 4 fossa of the scap

A

subscapular
supraspinous
infraspinous
glenoid fossa

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14
Q

why is the glenoid fossa diffeerent from the other scapular fossae

A

it has an articular facett (with the shoulder)

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15
Q

what are the different tubercles and processees of the scapula

A

coracoid
acromion
spine
infraglenoid tubrecle
supragleenoid tubercle

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16
Q

what are ethe 4 joints of the pectoral girdle

A

acromioclav joint
sternoclav jt
scapulothoracic jt
glenuhumueeral jtt

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17
Q

which is not an anatomical jt
acromioclav joint
sternoclav jt
scapulothoracic jt
glenuhumueeral jtt

A

scapulothoracic

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18
Q

what is the classification of tthe AC joint

A

synovial plane/glidinng

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19
Q

what ligameentst make up he coracoclavicular

A

trapezoid lig
conoid lig

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20
Q

true or false: the AC lig doese not allow alot of movmeent

A

true

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21
Q

what is spceial about the coracoacromia lig

A

it links two parts of scapula insteead of two bones togeether

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22
Q

what are the ligamentst associated witth the AC jt

A

acromioclav lig
coracoclav lig (trapezoid annd conoid)
coracoacromilia

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23
Q

true or false: AC dislocaiton is common

A

false, rare, results of truama

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24
Q

what is the classificaion of the sternoclav jt

A

synovial saddle

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25
Q

what are the different ligs of the SC jt

A

anterior and psotterior sterno clav
interclavicular
costoclavicular

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26
Q

what does the ac jt link

A

acromion process and the clavicle

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27
Q

what does the coracoclavicular lig link

A

clavicle and the coracoid process

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28
Q

what doese the coracoacromial link

A

coracoid process and acromion process

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29
Q

where is the interclavicular located

A

between the clavs

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30
Q

what does the anterior and potserior sternoclav lig joint

A

the stetrnum to the clavicle

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31
Q

what does the costoclav lig connectc

A

the clavicle inferiorly to the costal part of rib 1

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32
Q

what aree thee 3 articular surfacse oft the SC jt

A

sternal end of clavicle, manubrum, first costal carilage

33
Q

what is the axis of the saddle jt

A

biaxial jt

34
Q

explain how tthe SC jt is a saddlee jt

A

articular surfaces in thee shape of a saddle (concave along one axis and conveex along the otheer )

35
Q

true or false: ttherre is no axial rotaion at he SC jtt

A

false, there is very minimal axial rotattion

36
Q

what are the 3 types of movements at the SC jt

A

depression/elevation
protraction/retraction
axial roatiton

37
Q

understtand the slide about SC jt movement

A

;

38
Q

when abducting, dose the scap and clav stay stagnant

A

no , it stays constant for the first few degrees but then the clav and scap need to move
=scao glides againnst the thoracic cage

39
Q

trtue or false: the scapulothoracic jt is an anatomical jt and explain

A

false, there is no capsule, no cartialge, no ligaments
=it is a physiological jt

40
Q

what is the joint region of the scapulothoracic jt

A

anterior surface of scapula lying on posterior surface of ribs 2-7

41
Q

what are tthe two apposed msucle surffaces of the scapulothoracic jt

A

the subscapularis and the serrattus anterior (with loose connective tissue in nbettween to facilitate gliding)

42
Q

what is the function of tthe scapulothoracic jt

A

integrate pectoral girdle motion with shoulder joint to facilitate full abduction of shoulder complex

43
Q

what are the different types of movemnts of the pectoral girdle at the scapulothoracic jt

A

elevation/depression
protraction/retraction (abd and add)
updown rot/downward rot (lat/med(

44
Q

where is most of the movement at tthe scapulothoracic jt (movement of scapula on thoracic cage) happening att

A

sternoclavicular joint (less AC jt)

45
Q

what are the 2 anterior muscles of the pectoral girldle

A

subclavius
pectoralis minor

46
Q

describe the attachment of the subclavious

A

attaches to the firs rib (costtal carttilage) and to tthe inferior surface of the clavicle

47
Q

what is the functiton of the subclavius muscles

A

depresses the clavicle and sttabilzes the SC jt

48
Q

what is the innervatiton of tthe subclavius

A

subclavian nerve (C5-C6)

49
Q

describe tthe attachment of the pectoralis minor

A

attachese to the anterior sied of ribs 3-5 and tto the coracoid process of the scapula

50
Q

what is the function of the pectoralis minor

A

depression, protraction and downward rotattion of the scapula

51
Q

what is the innervaiton of the pec minor

A

medial pecttoral nerve (C8-T1)

52
Q

which muscle crosses the scapulothoracic jt

A

the pec minor also the lat dorsi

53
Q

what is the lateral muscle of the pecttoral girdle

A

serratus anterior

54
Q

descrbine the attachment of the serrattus anterior

A

attaches to the lateral surface of the ribs 1-8/9 and to the anteromedial border of the scapula

55
Q

what is the innervation of the serratus anterior

A

the long thoracic n (C5-C7)

56
Q

what is the function of the seerratus anterior

A

protracts the scapula (also accessory muscle of expiration)

57
Q

wha is he cause of winged scapula

A

injury to the long tthoracic nerve (trauma, impingement(

58
Q

what does injury to the long thoracic nerve cause

A

weakness or paralysis in serratus anterior and the inability/weakness in protracitng tthe scapula

59
Q

what are the 4 muscles of the posterior pectoral girdle

A

trapexius
lat dorsi
lev scap
rhombs minor and major

60
Q

describe the atttachment of the trapexius

A

skull/verts (C7-T12) to spine/acromion of scapula and LATERAL 1/3 of the clavicle

61
Q

what is the innervattin of the traps

A

accessory spinal n

62
Q

what is the function of the upper 1/3 ttraps

A

elevattion and upward rotation

63
Q

what is the function of the mid 1/3 ttraps (or all fibersO

A

retraction

64
Q

what is the function of the lower 1/3 ttraps

A

depression and upward rotation

65
Q

descrrbine the attachment of the lev scap

A

cervical spine to the supeerior angle/border og the scapula

66
Q

what is thee innrevation of the lev scap

A

C3-C5

67
Q

what is thee function of the lev scapula

A

elevation of scapula and some retrarcttion

68
Q

describe the attachemn of the rhomboids

A

cervical and thoracic spine to meedial border and inferior anglee of thee scapula

69
Q

what is the innervation of the rhomb

A

dorsal scapula C5

70
Q

what is the action of thee. rhombs

A

retraction, downward rotation (major). a and some. eeleevation. of the scapual

71
Q

describe the attachmentt. of tthee lat dorsi

A

from. t7-tt12. spinous proceesses, thoracolumbar fascia, ilium to thee interubercular groove of the humeurs

72
Q

what is the innervation of the lat dorsi

A

thoracodorsal n (c6-c8)

73
Q

what is the function of the lat dorsi

A

(should adduction, extnsion and medial rotation)

crossese the scapulothoracic joints so has actions on scapula motion=downward rotation and some retraction, depression

74
Q

when you elevate the scapula, which ligaments are taut/tight and which are loose

A

superior capsule and interclavicykar are loose
costoclav are tight

75
Q

when you depress the scapula, which ligaments are taut/tight and which are loose

A

superior capsule and interclavicykar are tight
costoclav are loose

76
Q

when you do retraction/posterior movement of the clavciel, which ligs are tight and which are loose.

A

Posterior sternocalv is loose
anterior sternoclav is tight and costcoclav is tight

77
Q

when you do posterior/protraction movement of the clavciel, which ligs are tight and which are loose.

A

posteriocalv is tight
anterior sternoclav and costcoclav are loose

77
Q
A

Anatomy 315 (25 decks)

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