The division of the back that is also called the neck region is the region.

correct answer is cervical

Explanation:

the neck region is cervical vertebrae

because bones in our neck region of spine is called as cervical vertebrae  

and cervical vertebrae of spine consist 7 bony ring

and these are reside in neck between base of skull and thoracic vertebra

and (C1 to C7) cervical vertebrae hole is called transverse  

so here the correct answer is cervical  

answer conditional instability;