. A laboratory manual and text-book of embryology. Embryology. 58 THE STUDY OF CHICK EMBRYOS mesenchyma in the section. The structure of the germinal area is complicated by the presence of collapsed blood-vessels. Transverse Section through the Hind-brain and Auditory Placodes (Fig. 43).—Besides the auditory placodes already described as the anlages of the internal ear, this section is characterized (1) by the large hind-brain, somewhat flattened dorsad; (2) by the broad dorso-ventrally flattened pharynx, above which on each side lie the dorsal aorta; (3) by the Ectoderm. Mesendyi Descending a
. A laboratory manual and text-book of embryology. Embryology. 58 THE STUDY OF CHICK EMBRYOS mesenchyma in the section. The structure of the germinal area is complicated by the presence of collapsed blood-vessels. Transverse Section through the Hind-brain and Auditory Placodes (Fig. 43).—Besides the auditory placodes already described as the anlages of the internal ear, this section is characterized (1) by the large hind-brain, somewhat flattened dorsad; (2) by the broad dorso-ventrally flattened pharynx, above which on each side lie the dorsal aorta; (3) by the Ectoderm. Mesendyi Descending aorta. Neural tube Ndtochord FbrequT Pharyngeal membrane Splanchnopleure Fig. 42.—Transverse section through the pharyngeal membrane of a thirty-six-hour chick embryo. X 75-. Ectode Notochord Descending Qorta Pericardial cavity Somatic trie Neural tube Ant Cardinal Vein Auditory placode Forec/ut Ectoderm. 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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