Dorsalgia. Please see http://en.wikipedia.org/wiki/Back_pain
Lumbago
abdominal pain
The scientific term for pain is "nociception," which refers to the neural process of encoding and processing harmful stimuli.
A scientific name for "the human spine" is called a "vertebrae."
Vertebrae.
Vertebrae = spine.
Its a Phrynosoma
The vertebral column.
Posterior thoracic.
Brown Recluse
Crotalus adamanteus
"invertebrates"