Thoracic vertebrae

Thoracic vertebrae composed the middle segment of the vertebral column, between the cervical vertebrae and the lumbar vertebrae.

In 2369, a clone of Ibudan was killed when a knife was thrust directly between his left and right thoracic vertebrae, perforating the lower ventricle of his heart. 

Later that year, Julian Bashir reported that Kai Opaka's upper thoracic vertebrae were crushed following the crash of the USS Yangtzee Kiang.