. Chordate anatomy. Chordata; Anatomy, Comparative. 282 CHORDATE ANATOMY longitudinal septum which divides the heart into right and left chambers. 3. The relative hypertrophy of the two atria, that of the right side enlarg- ing more rapidly. 4. The separation of atria and ventricles by growth of atrio-ventricular valves. 5. The inclusion (in amniotes) of the posterior division of the heart, the sinus venosus, within the right atrium. 6. The division of the anterior portion of the heart, the conus, into aorta and. cervical intersegmental branches of dorsal aortic root subclavian a (right) arter
. Chordate anatomy. Chordata; Anatomy, Comparative. 282 CHORDATE ANATOMY longitudinal septum which divides the heart into right and left chambers. 3. The relative hypertrophy of the two atria, that of the right side enlarg- ing more rapidly. 4. The separation of atria and ventricles by growth of atrio-ventricular valves. 5. The inclusion (in amniotes) of the posterior division of the heart, the sinus venosus, within the right atrium. 6. The division of the anterior portion of the heart, the conus, into aorta and. cervical intersegmental branches of dorsal aortic root subclavian a (right) arterial circle (of Willis; hypophysis ophth. a ant. cerebral a. mid. cer. a. post. cer. a int. carotid artery subclavian a. (left) ^ thoracic intersegmental arteries. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son & Co.
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