. The elements of embryology . Embryology. VI.] THE EAR. 157 aortic trunk of mandibular arch; pp. head cavity of mandibular arob; Ivc. alimentary pouch which will form the first visceral cleft; Th. rudiment of thyroid body. canal (Fig. 27, au. p.). It then had the form of a shallow pit with a widely open mouth, similar in form to that shewn for an embryo dog-fish in Fig. 53, aw. p. Before the end of the third day, its mouth closes up and all signs of the opening are obliterated. The pit thus becomes converted into a closed vesicle, lined with /epiblast, and surrounded by mesoblast. This
. The elements of embryology . Embryology. VI.] THE EAR. 157 aortic trunk of mandibular arch; pp. head cavity of mandibular arob; Ivc. alimentary pouch which will form the first visceral cleft; Th. rudiment of thyroid body. canal (Fig. 27, au. p.). It then had the form of a shallow pit with a widely open mouth, similar in form to that shewn for an embryo dog-fish in Fig. 53, aw. p. Before the end of the third day, its mouth closes up and all signs of the opening are obliterated. The pit thus becomes converted into a closed vesicle, lined with /epiblast, and surrounded by mesoblast. This vesicle is the otic vesicle, whose cavity rapidly enlarges while its walls become thickened (Fig. 54, GC). cv. AOA Section through the Hind-Brain of a Chick at the end OF the Third Day of Incubation. IT. Fourth ventricle. The section shews the very thin roof and thicker sides of 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 Foster, M. (Michael), Sir, 1836-1907; Balfour, Francis M. (Francis Maitland), 1851-1882; Sedgwick, Adam, 1854-1913; Heape, Walter, 1855-1929. London ; New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, bookpubli, booksubjectembryology
