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Flashcards in Atlanto-axial joint Deck (11):
1

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

the median atlanto-axial joint

2

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

the lateral atlanto-axial joint

3

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

the anterior bursa and the posterior bursa

4

What part of the vertical crus ligament may be absent?

the inferior crus ligament

5

What is the function of the transverse atlantal ligament?

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

6

**What is the ADI?

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

7

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

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

8

What are the attachment sites for the accessory atlanto-axial ligament?

the 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

9

What is the homolog of the posterior atlanto-axial ligament?

the ligamentum flavum

10

What are the degrees of movement facilitated at the atlanto-axial joint?

about 20 degrees flexion - extension, 40 degrees one side axial rotation, and 5 degrees of lateral bending

11

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

about 60%

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