Vertical sections of the heads of early embryos of the rabbit. Magnified. (From Mihalkovics.)
A. From an embryo 5 mm. long.
B. From an embryo 6 mm. long.
C. Vertical section of the anterior end of the notochord and hypophysis, etc., from an embryo 16 mm. long. In A the buccopharyngeal membrane is still present. In B it is in the process of disappearing, and the stomodeum now communicates with the primitive pharynx.
am. Amnion.
c. Fore-brain.
ch. Notochord.
f. Anterior extremity of fore-gut,
i. h. Heart.
if. Infundibulum.
m. Wall of brain cavity.
mc. Mid-brain.
mo. Hind-brain.
p. Original position of hypophyseal diverticulum, py.