Question

which cervical vertebrae does not have a spinous process?
atlas
axis
c6
c3

Explanation:

The atlas (C1) is a unique cervical vertebra. It lacks a typical spinous process. Instead, it has a posterior tubercle. The axis (C2) has a prominent dens (odontoid process) which is not a spinous process but it has a small spinous process. C3 - C6 (including C3 and C6) have spinous processes. The spinous processes of C3 - C6 are relatively short and bifid (except sometimes C6 which can be more prominent but still has a spinous process structure).

Answer:

Atlas