Fig. 11.  Gross anatomy of the mid- and lower thoracic spine. The lower thoracic vertebrae (T10–T12) are similar in morphology and ultrasonographic appearance to lumbar vertebrae. The middle thoracic vertebrae have steeply sloping spinous processes that make it impossible to obtain a transverse interlaminar view. The interlaminar spaces are also small, and the paramedian sagittal oblique view into the vertebral canal is limited as a result. (Image used with permission from www.usra.ca.)