. Text-book of embryology. Embryology. VI HEART OF BIRDS 385 left ventricle. This division comes about in a somewhat complicated tasnion the chief points in which, judging from Greil and Hoeh- stetters descriptions and figures, appear to be as follows. The ventricular portion of the cardiac tube is at an early stage encroached upon by the deep (« bulbo-auricular ") fold which separates the conus Fig. 183.—Stages in the development of the heart of the Fowl, viewed from the right side. The right wall of the heart has been removed in each ease. (After original drawings by Greil.) A, B,
. Text-book of embryology. Embryology. VI HEART OF BIRDS 385 left ventricle. This division comes about in a somewhat complicated tasnion the chief points in which, judging from Greil and Hoeh- stetters descriptions and figures, appear to be as follows. The ventricular portion of the cardiac tube is at an early stage encroached upon by the deep (« bulbo-auricular ") fold which separates the conus Fig. 183.—Stages in the development of the heart of the Fowl, viewed from the right side. The right wall of the heart has been removed in each ease. (After original drawings by Greil.) A, B, proximal ends of ridges of conns; , atrial septum; , bulbo-auricular ridge ; c, conus arteriosus ; , interventricular foramen ; , trabecular portion of ventricular septum ; , left auricle; p, pulmonary artery; , right auricle; , cut surface of endocardiac tissue of atrio- ventricular opening; r. V, cavity of right ventricle; st systemic aorta; V, ventricle; 1, 2, 3, conus ridges. from the atrial part of the heart (Fig. 182, A, ). The encroach- ment of this fold gives the ventricular part of the tube a squat U -shape. As the ventricle dilates the extent of the encroachment becomes reduced and the fold may now be called the bulbo-auricular ridge of the heart-lining (Fig. 183, A, ). During the fourth day this becomes extended tailwards along the ventral wall of the vol. II 2 c. 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 MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan
Size: 1613px × 1548px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology
