. A laboratory manual and text-book of embryology. Embryology. THE ANATOMY OF TEN TO TWELVE MM. PIG EMBRYOS 125 see p. 158.) The pharyngeal pouches are now larger than in the 6 mm. pig (Fig. 118). The first pouch persists as the Eustachian tube and middle ear cavity, the closing plate between it and the first branchial cleft forming the tympanic membrane. The second pouch later largely disappears. About it, develops the palatine tonsil. The third pouch is tubular, directed at right angles to the pharynx ^Telencephalon Mesencephalon Tela choroidea Neuromeres of myclcncephalon Kolochord Tongue S
. A laboratory manual and text-book of embryology. Embryology. THE ANATOMY OF TEN TO TWELVE MM. PIG EMBRYOS 125 see p. 158.) The pharyngeal pouches are now larger than in the 6 mm. pig (Fig. 118). The first pouch persists as the Eustachian tube and middle ear cavity, the closing plate between it and the first branchial cleft forming the tympanic membrane. The second pouch later largely disappears. About it, develops the palatine tonsil. The third pouch is tubular, directed at right angles to the pharynx ^Telencephalon Mesencephalon Tela choroidea Neuromeres of myclcncephalon Kolochord Tongue Spinal cord Dorsal Pancreas Ilepalic diverticulum Duodenum. L. genital fold L. mesonephros Diencephalon Post, lobe hypophysis Optic recess Telencephalon Aid. lobe hypophysis ulbus cordis Venlriele Yolk-sac Septum transversum Yolk-stalk Liver Carum 'Small intestine 'Allanlois Urogenital sinus Ureter Mesonephric duct Dorsal aorta Colon Umbilical artery (cut away) Me/auephros Rectum Fig. 117.—Median sagittal dissection of a 10 mm. pig embryo, showing the brain, spinal cord and viscera from the right side. X and meets the ectoderm to form a "closing ; Median to the plate, the ventral diverticulum of the third pouch is the anlage of the thymus gland. Its dorsal diverticulum forms an epithelial body, or parathyrcoid. The fourth pouch is smaller and its dorsal diverticulum gives rise to a second parathyreoid body. Its ventral diverticulum is a rudimentary thymus anlage. A tubular. 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
