Question

question 43 (mandatory) (1 point)
what is the upper limit normal measurement of the atlantodental interval in adults?
3mm
3cm
5mm
5cm

Explanation:

The atlantodental interval is the space between the anterior arch of the atlas (C1 vertebra) and the dens (odontoid process) of the axis (C2 vertebra). In adults, the normal upper limit of this measurement is 3mm. A larger measurement may indicate ligamentous laxity or injury. 3cm and 5cm are too large (1cm = 10mm, so 3cm = 30mm and 5cm = 50mm which are not normal for this anatomical space). 5mm is the upper limit for children, not adults.

Answer:

3mm