Atlanto-Occipital Joint Flashcards Preview

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

Flashcards in Atlanto-Occipital Joint Deck (24):
1

What is the classification of the atlanto-occipital joint?

synovial (diarthrosis) ellipsoidal

2

What ligaments support the capsular ligament of the atlanto-occipital joint?

- anterior atlanto-occipital lig.
- anterior longitudinal lig.
- posterior atlanto-occipital lig.

3

What are the attachment sites of the capsular lig.?

it is attached to the base of the occipital condyle and to the margins of the superior articular process of the lateral mass of C1

4

What are the characteristics of the capsular ligament of the atlanto-occipital joint?

it is said to be loose, thin, and composed of collagen fibers

5

What other joint space does the atlanto-occipital joint communicate with?

the posterior bursa of the median atlanto-axial joint

6

What is the joint classification of the anterior atlanto-occipital ligament?

fibrous (amphiarthrosis) syndesmosis

7

What is the joint classification of the posterior atlanto-occipital ligament?

fibrous (amphiarthrosis) syndesmosis

8

What are the attachment sites of the anterior atlanto-occipital ligament?

- it is attached to the upper margin of the anterior arch of C1
- to the anterior margin of the foramen magnum

9

What is the median thickening of the anterior atlanto-occipital lig. called?

the anterior longitudinal lig.

10

The anterior longitudinal lig. of the atlanto-occipital lig. will attach at what locations?

the anterior tubercle of the anterior arch of C1 and to the anterior median part of the foramen magnum

11

What is the classic function of the anterior atlanto-occipital lig.?

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

12

What are the attachment sites of the posterior atlanto-occipital ligament?

- it is attached to the arcuate rim of the posterior arch of C1
- the superior articular process of the lateral mass of C1
- the posterior margin of the foramen magnum of the occipital bone

13

Ossification of the free margin of the posterior atlanto-occipital lig. results in which atypical bone classification?

accessory bone

14

Based on the amount of ossification of the anterior free margin of the posterior atlanto-occipital lig. what structures will form?

an incomplete or complete ponticulus posticus

15

What are the attachment sites of the ponticulus posticus?

- arcuate rim of the posterior arch of C1
- superior articular process of the lateral mass of C1

16

What other name may be used to identify a ponticulus posticus?

Kimmerle's anomaly

17

What names are given to the opening formed by the ponticulus posticus?

arcuate foramen or retroarticular canal

18

What forms the continous ligamentous ring between atlas and occiput?

- anterior atlanto-occipital lig.
- capsular lig.
- posterior atlanto-occipital lig.

19

What is the classic function of the posterior atlanto-occipital lig.?

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

20

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

about 25 degrees

21

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

about 3-8 degrees on side axial rotation

22

What amount of lateral bending is accommodated by the atlanto-occipital joint?

about 5 degrees

23

Which motion is best accommodated by the atlanto-occipital joint?

flexion-extension

24

Which motion is necessary to facilitate one side axial rotation at the atlanto-occipital joint?

flexion

Decks in Spinal Anatomy I - Exam 3 Class (94):