The cavities are along the back in humans. the cavity is one of the body cavities on the dorsal side. options: sentence 1- dorsal, ventral, or anterior sentence 2- cranial, thoracic, or pelvic

Sentence 1 = Dorsal
Sentence 2 = Cranial

Dorsal means the back side, I always remember it because I think of a dorsal fin on a dolphin and how it is on their back.
Also the cranial cavity is your brain area which leads to your spinal cord which is in the back side of the body.

Ithink it true i might be wrong so don't take my word that its true.