. A laboratory manual and text-book of embryology. Embryology. [26 THE STUDY OF SIX AND TEN MILLIMETER PIG EMBRYOS outgrowth, caudal to the fourth pouch, is regarded as a fifth pharyngeal pouch in human embryos and forms the post-branchial body on each side (see p. 172). The thyreoid gland, composed of branched cellular cords, is located in the mid- line between the second and third branchial arches (Fig. 118). Trachea and Lungs.—Caudal to the fourth pharyngeal pouches the eso- Otccyst ^ Calif juaalar^ Aortic an Post hbe hypophysis nt. lobe hypophysis Phar. pouch C
. A laboratory manual and text-book of embryology. Embryology. [26 THE STUDY OF SIX AND TEN MILLIMETER PIG EMBRYOS outgrowth, caudal to the fourth pouch, is regarded as a fifth pharyngeal pouch in human embryos and forms the post-branchial body on each side (see p. 172). The thyreoid gland, composed of branched cellular cords, is located in the mid- line between the second and third branchial arches (Fig. 118). Trachea and Lungs.—Caudal to the fourth pharyngeal pouches the eso- Otccyst ^ Calif juaalar^ Aortic an Post hbe hypophysis nt. lobe hypophysis Phar. pouch Caudal root n hypoglossal Ganyfrerle/ Aortic archl /lorhcarchS. Maxillary process Thyreoid aland Pulmonary art. Aorta. YolkJac R. Ventricle /£ Atrium Stomach 1 Dorsal pan ere h Vitelline arth Ventral pancreas \ I 1 l \Umbilical artery Uesctnainy Mono- \ \ \ \ \ Mesonephrlc duct Mothord Cephalic limb, iniesl. loop Fig. i 18.—Reconstruction of a 10 mm. pig to show the position of the various organs from the right side. The veins are not indicated. Broken lines indicate the outline of the left mesonephros and the positions of the limb buds. X 10, phagus and trachea separate and form entodermal tubes (Figs. 117 and 118). Be- fore the trachea bifurcates to form the primary bronchi there appears on its right side the tracheal bud of the upper lobe of the right lung. This bronchial bud is developed only on the right side and appears in embryos of 8 to 9 mm. Two secondary bronchial buds arise from the primary bronchus of each lung, and form the anlages of the symmetrical lobes of each lung (Fig. 119).. 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
