. The anatomical record. Anatomy; Anatomy. EARLY DEVELOPMENT OF HEART IN MAMMALIA 285 This superficial groove and the infolding of the myocardial wall are located in the caudal half of the ventricle, for they gra- dually disappear toward its cranial extremity, which is of con- ical form. The ventral myocardial layer is reflected onto the ventral wall of the pericardium, but is confined to the atrial region to a short length opposite to the foregut opening.. D.M. —AV.C. Fig. 20 Dorsal view of the reconstruction of an embryonic shield (stage VII). Dorsal wall of the pericardium has been removed
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. The anatomical record. Anatomy; Anatomy. EARLY DEVELOPMENT OF HEART IN MAMMALIA 285 This superficial groove and the infolding of the myocardial wall are located in the caudal half of the ventricle, for they gra- dually disappear toward its cranial extremity, which is of con- ical form. The ventral myocardial layer is reflected onto the ventral wall of the pericardium, but is confined to the atrial region to a short length opposite to the foregut opening.. D.M. —AV.C. Fig. 20 Dorsal view of the reconstruction of an embryonic shield (stage VII). Dorsal wall of the pericardium has been removed to show the pericardial cavity and the myocardial tubes. The myocardium shows cranially a single sac-formed ventricle, which bifurcates into two slender myocardial tubes caudalward. The transition between them is marked by the atrioventricular constriction cephalad to the foregut opening. A single cranial extremity of the ventricle is directed toward the top of the page. X 100. On the dorsal aspect the myocardial wall is reflected onto the dorsal wall of the pericardium and forms the dorsal mes- ocardium on both sides. The cranial extremity of the dorsal mesocardial attachment corresponds to a middle third of the ventricle, and from this point it continues farther caudalward. Consequently, the cranial half of the ventricle is free from the mesocardium (fig. 20). Between the lateral mesocardial layers. 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 work.. Bardeen, Charles Russell, 1871-1935, ed; Boyden, Edward A. (Edward Allen), 1886-1976; Bremer, John Lewis, 1874- ed; Hardesty, Irving, b. 1866, ed; American Association of Anatomists; American Society of Zoologists; Wistar Institute of Anatomy and Biology. [New York, etc. ] A. R. Liss [etc. ]