Figure 1From: Ependymal alterations in sudden intrauterine unexplained death and sudden infant death syndrome: possible primary consequence of prenatal exposure to cigarette smokingThick, pseudostratified ependymal layer of a 17-week human fetus. (a) In the lining of the fourth ventricle (histological section of brainstem); (b) in the lining of the central canal (histological section of thoracic spinal cord). Klüver-Barrera stain; magnification, 20×.Back to article page