File:Gray1182.png

Description
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.
 * ph. Pharynx.
 * sp.e. Sphenoethmoidal.
 * bc. Central.
 * sp.o. Sphenoöccipital parts of basis cranii.
 * tha. Thalamus.