. A laboratory manual and text-book of embryology. Embryology. A B Fig. 147.—Dissections to show the development of the hard palate in pig embryos. A, ventral view of palatine processes of a 22 mm. pig embryo, the mandible having been removed; B, same of 35 mm. embryo showing fusion of palatine processes. palatine folds are approximated and soon fuse, thus cutting off the nasal passages from the primitive oral cavity dorsad (Fig. 147 B). At the point in the median line where the lateral and median palatine processes meet, fusion is not complete, leaving the incisive fossa, and laterad between
. A laboratory manual and text-book of embryology. Embryology. A B Fig. 147.—Dissections to show the development of the hard palate in pig embryos. A, ventral view of palatine processes of a 22 mm. pig embryo, the mandible having been removed; B, same of 35 mm. embryo showing fusion of palatine processes. palatine folds are approximated and soon fuse, thus cutting off the nasal passages from the primitive oral cavity dorsad (Fig. 147 B). At the point in the median line where the lateral and median palatine processes meet, fusion is not complete, leaving the incisive fossa, and laterad between the two processes openings persist for some time, which are known as the incisive canals (of Sten- son). After the withdrawal of the tongue, the lateral palatine pro- cesses take up a horizontal posi- tion and their edges are approxi- mated, because the cells on the ventral sides of the folds prolifer- ate more rapidly than those of the dorsal side (Schorr, Fig. 14S.—The roof of the mouth of a human embryo about two and a half months old, showing the develop- ment of the palate, , processus globularis; ', pala- tine process of processus globularis; mx, maxillary pro- cess; ', palatine fold of maxillary process. Close to the angle between this and the palatine process of the processus globularis on each side, the primitive choanal (.After His.) Hefte, Bd. 36, 1908). That the change in position of the palatine folds is not mechanical, but due to unequal growth, may be seen in Fig. 149, a section through the palatine folds of a pig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectembryology, bookyear1
