Yolk Sac - Additional Images

Additional Images

• Surface view of embryo of Hylobates concolor.

• Human embryo—length, 2 mm. Dorsal view, with the amnion laid open. X 30.

• Dorsum of human embryo, 2.11 mm. in length.

• Section through the embryo.

• Diagram showing earliest observed stage of human ovum.

• Diagram illustrating early formation of allantois and differentiation of body-stalk.

• Diagram showing later stage of allantoic development with commencing constriction of the yolk-sac.

• Diagram illustrating a later stage in the development of the umbilical cord.

• Fetus of about eight weeks, enclosed in the amnion. Magnified a little over two diameters.

• Model of human embryo 1.3 mm. long.

• Section through ovum imbedded in the uterine decidua

• Human embryo about fifteen days old. Brain and heart represented from right side. Digestive tube and yolk sac in median section.