Question

which of the following atypical thoracic vertebra has a single pair of whole facets, which are located across both the vertebral body and the pedicle.

Explanation:

Atypical thoracic vertebrae include T1, T9 - T12. Among them, T10 has a single pair of whole facets (costal facets) that span both the vertebral body and the pedicle. T1 has a mix of half and whole facets, T9 has a single pair of whole facets but the positioning is slightly different in terms of the typical description here, and T11 - T12 have complete costal facets on the body but the key feature of a single pair across body and pedicle matches T10.

Answer:

The 10th thoracic vertebra (T10)