. The American journal of anatomy. Fig. 11 Camera lucida drawing of capillary net in area opaca during eighthday of incubation. Operated chick. Enl. 52 X. 192 W. B. CHAPMAN continuing progressively until the sinus is resolved into capillariesby about the tenth day of incubation. I tested this out on afew normal chicks and found that the process begins about thetime mentioned, but that it is often complete by the sixth dayof incubation. I was much surprised to find that the sinus ter-minalis in the operated chicks followed this general rule andbegan to break up into capillaries at about the sam
. The American journal of anatomy. Fig. 11 Camera lucida drawing of capillary net in area opaca during eighthday of incubation. Operated chick. Enl. 52 X. 192 W. B. CHAPMAN continuing progressively until the sinus is resolved into capillariesby about the tenth day of incubation. I tested this out on afew normal chicks and found that the process begins about thetime mentioned, but that it is often complete by the sixth dayof incubation. I was much surprised to find that the sinus ter-minalis in the operated chicks followed this general rule andbegan to break up into capillaries at about the same time as thenormal. Figure 12 shows the sinus at forty-four hours, beforebreaking-up has started. Figure 13 is from a chick of eighty. Sinus terminalis. Fig. 12 A section of the sinus terminalis of <i chick of 44 hours incubation inwhich the heart was destroyed by burning with the cautery in the region of theheart rudiment. Operated at twentieth hour of incubation. hours incubation, and figure 15 is from a section of a chick onehundred and five hours old where the vessel has been replaced bya richly growing capillary plexus, which, judging by the periph-eral sprouting, is highly vegetative. This was a somewhat ex-treme case and in the same embryo portions of the sinus had notyet begun to break up, although it had extended some distancefrom the embryo after the operation. Figure 1(3 is a cameralucida drawing of the sinus region of a normal chick of the sameage. This drawing more nearly represents the conditions foundin both normal and operated chicks of this age. In operated chicks of seven or eight days of age the sinus ter-minalis had invariably broken up into capillaries, although the DEVELOPMENT OF VESSELS WITH
Size: 1553px × 1608px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectanatomy
