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Figure 3


Fig. 1C —Schematics illustrate three stages of spinal cord development. Retrogressive differentiation (programmed cell death) is process whereby caudal cell mass and neural tube regress in size to form fetal conus medullaris, ventriculus terminalis, and filum terminale. Note labeled structures. (Reprinted with permission from Barkovich AJ. Normal development of the neonatal and infant brain, skull and spine. In: Barkovich AJ. Pediatric neuroimaging, 3rd ed. Philadelphia, PA: Lippincott Williams & Wilkins, 2000:624 [2])