Archive image from page 82 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Fig. 64.—Anterior View of Boundaries of Stomatodaeum before Completion of Primi- tive Upper Lip. The bucco-pharyngeal membrane disappears about the third week, and about the twenty-first day a diverticulum from the stomatodseum is projected into the caudal surface of the head, from the angle immediately ventral to the point where that surface originally joined the ex- ternal surface of the bucco-pharyngeal membrane. The diverticulum is Rathke's pouch. T
Archive image from page 82 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Fig. 64.—Anterior View of Boundaries of Stomatodaeum before Completion of Primi- tive Upper Lip. The bucco-pharyngeal membrane disappears about the third week, and about the twenty-first day a diverticulum from the stomatodseum is projected into the caudal surface of the head, from the angle immediately ventral to the point where that surface originally joined the ex- ternal surface of the bucco-pharyngeal membrane. The diverticulum is Rathke's pouch. The cranial extremity of the pouch comes into relation with the hypophyseal diverticulum from the floor of the third ventricle, and dilates. The stalk which connects the dilated terminal part of the diverticulum. with the stomatodseum dis- appears, and the terminal vesicle becomes the anterior lobe of the hypophysis ( pituitary body) (Figs. 57, 62, 63). The Separation of the Stomatodaeum into Nose and Mouth.—In the cephalic boundary of the stomatodseal space lies the ventral end of the head, which is called the fronto-nasal process. Upon the fronto-nasal process, on either side of the median plane, is situated a shallow pit, the olfactory pit, and by the pits the process is divided into a median part, the median nasal process, and two lateral parts, the lateral nasal processes. Further, the margin of the median process is divided by a median cleft into right and left globular processes (Fig. 64). The orifices of the olfactory pits are directed laterally, therefore the lateral nasal processes lie dorsal to the median nasal process in the cranial boundary of the stomatodEeal space, and as their margins increase in height the pits deepen (Fig. 69). At this period the cranial boundary of the stomatodaeum is divided by the median sulcus and the olfactory pits into four projections—the two globular processes, each of which lies between the median sulcus and an olfactory pit.
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