How many vertebrae are found in the thoracic spine of cats and dogs?

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Multiple Choice

How many vertebrae are found in the thoracic spine of cats and dogs?

Explanation:
The main idea is that the thoracic spine is defined by the vertebrae that bear ribs, and in domestic cats and dogs there are 13 of these thoracic vertebrae. In both species the typical vertebral formula is 7 cervical, 13 thoracic, 7 lumbar, 3 sacral, with the tail (coccygeal) vertebrae varying by individual. Since each thoracic vertebra pairs with a rib, and these species have 13 rib pairs, there are 13 thoracic vertebrae. Numbers like 11, 12, or 14 would not align with the actual rib-to-vertebra arrangement in cats and dogs.

The main idea is that the thoracic spine is defined by the vertebrae that bear ribs, and in domestic cats and dogs there are 13 of these thoracic vertebrae. In both species the typical vertebral formula is 7 cervical, 13 thoracic, 7 lumbar, 3 sacral, with the tail (coccygeal) vertebrae varying by individual. Since each thoracic vertebra pairs with a rib, and these species have 13 rib pairs, there are 13 thoracic vertebrae. Numbers like 11, 12, or 14 would not align with the actual rib-to-vertebra arrangement in cats and dogs.

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