Atlanto-Occipital & Atlanto-Axial & Occipito-Axial Joints Flashcards Preview

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Flashcards in Atlanto-Occipital & Atlanto-Axial & Occipito-Axial Joints Deck (30)
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1

classification of the atlanto-occipital joint

synovial (diarthrosis) ellipsoidal

2

other joint space that the atlanto-occipital joint will communicate with

posterior bursa of the median atlanto-axial joint

3

classic function of the anterior atlanto-occipital ligament

brakes or limits "extension" of the skull over the cervical spine

4

ossification of the free margin of the posterior atlanto-occipital ligament results in which atypical bone classification

accessory bone

5

other name that may be used to ID a ponticulus posticus

Kimmerle's anomaly

6

names given to the opening formed by the ponticulus posticus

arcuate foramen or retroarticular canal

7

classic function of the posterior atlanto-occipital joint

brakes or limits axial rotation, flexion, and perhaps lateral bending of the skull on atlas

8

amount of flexion-extension that is accommodated by the atlanto-occipital joint

~25*

9

amount of axial rotation that is accommodated by the atlanto-occipital joint

~3-8* one side axial rotation

10

amount of lateral bending accommodated by the atlanto-occipital joint

~5*

11

motion is best accommodated by the atlanto-occipital joint

flexion-extension

12

which atlanto-axial joint is ID'ed as a synovial plane

lateral atlanto-axial joint

13

which atlanto-axial joint is ID'ed as a synovial pivot

median atlanto-axial joint

14

names given to the synovial joint spaces of the median atlanto-axial joint

anterior bursa and the posterior bursa

15

function of the transverse atlantal ligament

it is the primary stabalizer of the atlanto-axial joint restricting the distance of C2 from the anterior arch of C1

16

what is ADI

Atlanto-Dental Interspace, a radiographic distance between the surfaces of the anterior bursa of the median atlanto-axial joint

17

ADI is observed between which surfaces

fovea dentis of C1 and the facet for fovea dentis of C2

18

ADI of children vs adults

children = 4.5 mm
adults = 2-3 mm or about 2.5 mm

19

attachment sites for the accessory atlanto-axial ligament

base of the odontoid process and vertebral body of axis to the tubercle for the transverse atlantal ligament on the lateral mass of C1

a superior continuation may attach on the occipital bone just behind that of the alar ligament

20

degrees of movement facilitated at the atlanto-axial joint

20* flexion-extension
40* one side axial rotation
5*lateral bending

21

occiput-C1-C2 joint complex accounts for what percent of all cervical axial rotation

~60%

22

ligament that attaches to the anterior margin of the foramen magnum and the tip of the odontoid process of C2

apical ligament of the dens or the apicodental ligament

23

the embryonic derivative of the apical ligament of the dens or the apicodental ligament

notochord

24

function of the alar ligament

together they function to resist axial rotation

25

forms the cranial continuation of the PLL

membrana tectoria or tectorial membrane

26

attachement sites for the superficial layer of the membrana tectoria

posterior part of the inferior epiphyseal rim and vertebral body of C2 to the capsular ligament of the atlanto-occipital joint and cranial dura of the posterior cranial fossa

27

list, in order, ligaments in the midsagittal plane from the dura mater at the level of the medulla oblongata to the anterior bursa of the median atlanto-axial joint

membrana tectoria

cruciate ligament

capsular ligament of the posterior bursa of the median atlanto-axial joint

apical ligament of the dens

28

for cervical spine below C2, what is the range of flexion-extension

~90* or 18* per couple

29

for cervical spine below C2, what is the range of one side lateral bending

~50* or 10* per couple

30

for cervical spine below C2, what is the range one side axial rotation

~33* or 6* per couple