. A laboratory manual and text-book of embryology. Embryology. THE DEVELOPMENT OF THE TONGUE 159 tion in a plane parallel to the first (Fig. 150, III). Place the ventral portion of the head in a watch-glass of alcohol and, under the dissecting microscope, remove that part of the preparation cranial to the mandibular arches. Looking down upon the floor of the pharynx, remove any portions of the lateral pharyngeal wall which may still interfere with a clear view of the pharyngeal arches as seen in Fig. 151. Permanent mounts of the three stages mentioned above may be made and used for study by th
. A laboratory manual and text-book of embryology. Embryology. THE DEVELOPMENT OF THE TONGUE 159 tion in a plane parallel to the first (Fig. 150, III). Place the ventral portion of the head in a watch-glass of alcohol and, under the dissecting microscope, remove that part of the preparation cranial to the mandibular arches. Looking down upon the floor of the pharynx, remove any portions of the lateral pharyngeal wall which may still interfere with a clear view of the pharyngeal arches as seen in Fig. 151. Permanent mounts of the three stages mentioned above may be made and used for study by the student. In both human and pig embryos, the body of the tongue is developed from three anlages which are formed in front of the second branchial arches. These are the median, somewhat triangular tuberculum impar, and the paired lateral thicken- ings of the mandibular arches, both of which are present in human embryos of 5 mm. (Fig. 152 A). At this stage, a median ventral elevation formed by. Fig. 150.—Lateral view of the head of a 7 mm. pig embryo. The three lines indicate the planes of sections to be made in dissecting the tongue as de- scribed in the text. Br. arch I- Tuberculum impar —"jfc"' " Br. arch II-. 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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