Development of the spinous process of the second thoracic vertebra of the mouse in the late fetal and early postnatal period.

The bony spinous process of T2 in certain inbred strains of the mouse is variable in size or in some cases absent. The development of this process has been investigated in histological sections of CBA, C57BL and tk/tk mice between birth and 14 days. The spinous process is shown to be modified in shape and size late in development.