. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Fig. 104.—Diagram representing under surface of an embryo rabbit of nine days andthree hours old, illustrating development of the heart (after Allen Thomson). of the entire embryo; B, an enlarged outline of the heart of A; C. later stageof the development of B; h h, ununited heart; aa, aorUe; vv, vitillme veins. splanchnopleure, and so lies within the pleuro-peritoneal cav-ity, and is derived from the mesoblast. At the beginning theheart consists of two solid columns ununited in
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . Fig. 104.—Diagram representing under surface of an embryo rabbit of nine days andthree hours old, illustrating development of the heart (after Allen Thomson). of the entire embryo; B, an enlarged outline of the heart of A; C. later stageof the development of B; h h, ununited heart; aa, aorUe; vv, vitillme veins. splanchnopleure, and so lies within the pleuro-peritoneal cav-ity, and is derived from the mesoblast. At the beginning theheart consists of two solid columns ununited in front at first ;later, these fuse, in part, so that they have been comparedwith an inverted Y, in which the heart itself would correspondto the lower stem of the letter Q) and the great veins (vitel-line) to its main limbs. The solid cords of mesoblast become 102 COMPARATIVE PHYSIOLOGY. hollow prior to their coalescence, when the two tubes becomeone. The entire blood-vascular system originates in the mesoblastof the area opaca especially; at first appearing in isolated spots
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1890
