. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 160 TEXT-BOOK OF EMBRYOLOGY. monary veins. Still later, the sinus venosus is merged into the wall of the right auricle, and hence the venous trunks above mentioned empty by separate orifices into its cavity. The line of demarcation between the sinus venosus and the auricle proper is indicated in the adult heart by the sulcus terminalis, a groove on the outer surface of the auricle which Pu s Ao ?«. 5 Jo nL. A B Fig. 79—Two diagrams (after Born) to elucidate the changes in the mutual relations of
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 160 TEXT-BOOK OF EMBRYOLOGY. monary veins. Still later, the sinus venosus is merged into the wall of the right auricle, and hence the venous trunks above mentioned empty by separate orifices into its cavity. The line of demarcation between the sinus venosus and the auricle proper is indicated in the adult heart by the sulcus terminalis, a groove on the outer surface of the auricle which Pu s Ao ?«. 5 Jo nL. A B Fig. 79—Two diagrams (after Born) to elucidate the changes in the mutual relations of the interventricular orifice and the ostium interventriculare as well as the division of the ventricle and large arteries. The ventricles are imagined to have been divided into halves; one looks into the posterior (dorsal) halves, in which, moreover, the cardiac trabecular, etc., have been omitted for the sake of simplifying the view. A, heart of an embryo rabbit, in which the head is mm. long. The ventricle is divided by the ventricular partition (ks) into a left and a right half as far as the interventricular orifice (Oi). The right end of the foramen atrioventriculare commune (F. av. c) extends into the right ventricle; the endocardial cushions (o. ek, u. ek) are developed. B, heart of an embryo rabbit, head mm. long. The endocardial cushions (o. ek, u. ek) of the foramen atrioven- triculare commune are fused, and thereby the foramen atrioventriculare commune is now separated into a foramen atrioventriculare dextrum (F. av. d) and sinistrum (). The ventricular partition (ks) has likewise fused with the endocardial cushions, and has grown forward as far as the partition (s) of the truncus arterio- sus. By the closure of the remnant of the ostium interventriculare (Oi) the sep- tum membranaceum is formed; rk, right, lk, left ventricle; ks, ventricular parti- tion ; Pu, arteria pulmonalis; Ao, aorta; s, partition of the truncus arteriosus; Oi, ostium inter
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