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