. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 376 BLTLLETIN: MUSEUM OP COMPARATI\^ ZOOLOGY a) Is the palatine process present in the embryo of all pas- serine birds including those which do not exhibit a distinct pala- tine process as adults? b) Is the "palato-maxillary" a separate center of ossifica- tion? c) Is the free palatine process as seen in the adult cardinal homologous with the palatine process of other passerine birds, or is it an ossified tendon?. Figure 5. Series showing the development of the palatine process of the premaxilla in the crow
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 376 BLTLLETIN: MUSEUM OP COMPARATI\^ ZOOLOGY a) Is the palatine process present in the embryo of all pas- serine birds including those which do not exhibit a distinct pala- tine process as adults? b) Is the "palato-maxillary" a separate center of ossifica- tion? c) Is the free palatine process as seen in the adult cardinal homologous with the palatine process of other passerine birds, or is it an ossified tendon?. Figure 5. Series showing the development of the palatine process of the premaxilla in the crow (Corvus). Except for figure A which shows both halves of the skull, the figures illustrate the ventral surface of the left half of the skull. The ages of the specimens are: (A) Sixth day of incubation; (B) Ninth day of incubation; (C) Hatchling; (D) Week-old hatchling; and (E) Fledgling. The figures are redrawn from Parker (1872). Fused palatine process. A few specimens with an unfused or a partly fused palatine process can be found in almost every large series of birds normally having the palatine process of the premaxilla completely fused with the prepalatine process in the adult (, Cyanocitta cristata, Fig. 28F). These specimens usually show signs of immaturity, such as unossified "parietal ; This would suggest that the palatine process is pres- ent in the young bird and becomes increasingly fused with the prepalatine process until the two bones are completely fused in the adult. The typical course of development of the palatine process in the Passeres can be seen in the crow (Corvus). The following account and figures have been taken from Parker's description of the development of the skull of the crow (1872), Avhich is still. 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 Harvard
Size: 2501px × 999px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology
