Question

what is the purpose of the transverse ligament?
preventing rotation of c1 on the occiput
preventing posterior translation of the dens
allowing rotation of c1 on the occiput
connecting the dens to the occiput

Explanation:

The transverse ligament of the atlas (C1) stabilizes the dens (odontoid process of C2) by limiting its posterior movement relative to C1, which protects the spinal cord. The other options are incorrect: it does not act on the C1-occiput joint rotation, nor connect the dens to the occiput.

Answer:

Preventing posterior translation of the Dens