. A laboratory manual and text-book of embryology. Embryology. Fie. 145.—FJevelopment of the face of the human embryo (His). A, embryo of about twenty-nine days. The median frontal process differentiating into median nasal processes or processus globulares, toward which the maxillary processes of first visceral arch are extending. B, embryo of about thirty- four days: the globular, lateral nasal, and maxillary processes are in apposition; the primitive naris is now better defined. C, embryo of about the eighth week: immediate boundaries of mouth are more definite and the nasal orifices are par
. A laboratory manual and text-book of embryology. Embryology. Fie. 145.—FJevelopment of the face of the human embryo (His). A, embryo of about twenty-nine days. The median frontal process differentiating into median nasal processes or processus globulares, toward which the maxillary processes of first visceral arch are extending. B, embryo of about thirty- four days: the globular, lateral nasal, and maxillary processes are in apposition; the primitive naris is now better defined. C, embryo of about the eighth week: immediate boundaries of mouth are more definite and the nasal orifices are partly formed, external ear appearing. I), embryo at end of second month. DEVELOPMENT OF THE HARD PALATE This may be studied advantageously in pig embryos of two stages: (a) 20 to 25 mm. long; (b) 28 to 35 mm. long. In the first stage, the jaws are close together and the mandible usually rests against the breast region. The palatine processes are separated by the tongue and are directed ventrad (Fig. 146 A). In embryos of 26 to 28 mm., the jaws open and the tongue lies ventral to the palatine processes which now approach each other in a horizontal plane (Fig. 146 B). Dissections may be made by carrying a shallow incision from the. 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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