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Spinal Anatomy I - Exam 3 > Atlanto-Axial Joint > Flashcards

Flashcards in Atlanto-Axial Joint Deck (55)
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1

What are the classifications of the atlanto-axial joint?

- synovial pivot (diarthrosis trochoid)
- synovial plane (diarthrosis arthrodia)
- fibrous (amphiarthrosis) syndesmosis

2

Which atlanto-axial joint is identified as a synovial pivot (diarthrosis trochoid)?

the median atlanto-axial joint

3

Which atlanto-axial joint is identified as a synovial plane (diarthrosis arthrodia)?

the lateral atlanto-axial joint

4

Which atlanto-axial joint is identified as a fibrous (amphiarthrosis) syndesmosis?

any non-capsular lig. typically forms a joint with this classification

5

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

- anterior bursa
- posterior bursa

6

What are the joint surfaces of the median atlanto-axial joint at the anterior bursa?

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

7

What are the joint surfaces of the median atlanto-axial joint at the posterior bursa?

- the groove for the transverse atlantal lig. of C2
- transverse atlantal lig.

8

Perpendicular ligamentous extensions from the transverse atlantal lig. will form what lig.?

the vertical crus lig.

9

What are the parts of the vertical crus lig.?

- superior crus lig.
- inferior crus lig.

10

What are the attachment sites of the superior crus lig.?

- upper margin of the transverse atlantal lig.
- anterior margin of the foramen magnum

11

What are the attachment sites of the inferior crus lig.?

- lower margin of the transverse atlantal lig.
- posterior surface of the vertebral body of C2

12

What part of the vertical crus lig. may be absent?

inferior crus lig.

13

What lig. is formed by the transverse atlantal lig. and its perpendicular extension?

cruciate lig. or cruciform lig.

14

What are the attachment sites of the transverse atlantal lig.?

tubercles for the transverse atlantal lig. on the lateral mass of C1

15

Why is the transverse atlantal lig. not a typical lig.?

- it does not attach 2 or more bones together
- it attaches parts of the same vertebra

16

What histological feature is present on the anterior surface of the transverse atlantal lig.?

fibrocartilage at the surface of the lig. articulating with C2

17

What is the function of the transverse atlantal lig.?

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

18

Where is Barkow's lig./lig. of Barkow observed?

just above the anterior arch of C1 and in front of the dens near its tip

19

What are the attaching sites of Barkow's lig.?

to the occipital condyles just in front of the alar attachment site

20

What is the function of Barkow's lig.?

it may restrict extension (hyperextension or dorsi-flexion) of the atlanto-occipital joint

21

Where is the transverse occipital lig. observed?

posterior to the tip of the dens, between the superior crus of the cruciate lig. and the apicodental lig/lig of the dens

22

What are the attachment sites of the transverse occipital lig?

to the occipital condyles, above and behind the alar attachment site

23

What is the function of the transverse occipital lig.?

it may assist the alar ligs in limiting or stabilizing axial rotation and perhaps lateral bending and flexion of the craniovertebral junction

24

Where is the lateral atlanto-occipital lig. observed?

just beyond the lateral margin of the rectus capitis lateralis muscle

25

What are the attachment sites of the lateral atlanto-occipital lig?

- transverse process of C1 near or on the posterior tubercle
- jugular process of the occipital bone

26

What is the function of the lateral atlanto-occipital lig.?

it may play a role in limiting axial rotation of the atlanto-occipital joint

27

What movements are facilitated at the median atlanto-axial joint?

- flexion-extension
- rotation
- telescoping (superior-inferior gliding)

28

What is the ADI?

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

29

The ADI is observed between which surfaces?

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

30

What is the ADI of children compared with that of adults?

- about 4.5 mm in children
- a range of 2-3 mm or about 2.5 mm in adults

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