sentence: The upper three regions comprise the remaining 24, and are grouped under the names cervical (7 vertebrae), thoracic (12 vertebrae) and lumbar (5 vertebrae), according to the regions they occupy.
modified: fix grammar: The upper three regions comprise the remaining 24 and are grouped under the names cervical 7 vertebrae thoracic 12 vertebrae and lumbar 5 vertebrae according to the regions they occupy