. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. BRAINCASE, BASIGRANIAL AXIS, MEDIAN SEPTUM IN THE DINOCEPHALIA 207 The endocranial cast (Fig. 7) From the cleaned endocranial cavity I have made an endocranial cast using a pliable rubber compound (revultex). Of this cast I am including here outline drawings as projected from the side and from above. It is obvious that such a cast is of the endocranial cavity and not of the brain, which did not fill the cavity, with the result that the various divisions of the brain are but vaguely indicated. Of the
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. BRAINCASE, BASIGRANIAL AXIS, MEDIAN SEPTUM IN THE DINOCEPHALIA 207 The endocranial cast (Fig. 7) From the cleaned endocranial cavity I have made an endocranial cast using a pliable rubber compound (revultex). Of this cast I am including here outline drawings as projected from the side and from above. It is obvious that such a cast is of the endocranial cavity and not of the brain, which did not fill the cavity, with the result that the various divisions of the brain are but vaguely indicated. Of the forebrain (prosencephalon) the shape of the olfactory bulbs cannot be determined as they were for the greater part not enclosed in bone. The olfactory tracts, lying as they do in tubes formed by the septosphenoid, can be distinguished. The tract was short and oval in cross-section. The olfactory lobe is indicated by a small laterally directed bulge. The position of the thalamus is indicated by the position of the optic stalk and the pituitary cavity. The hypo- physial or pituitary cavity is enormous. How much of the cavity was filled by infundibulum, pituitary and accessory structures cannot be determined, but the tendency to gigantism and the pachyostosis would indicate the presence of a large pituitary gland. Above the thalamus lies the truly enormous parietal canal or tube. If the soft structures completely fill this space their mass would be considerable. The volume in this specimen is ± 65 cc and the total volume of the endocranial cast (with allowance made for the olfactory bulbs) is i 270 cc. In vertebrates a number of structures are known arising from the brain Fig, 7. Struthiocephalus whaitsi 12049 x £. A plastic cast taken from the cleaned endocranial cavity drawn in: A. Lateral view. B. Dorsal view with the root of the pineal mass seen in B XII ^i v iv 11. Please note that these images are extracted from scanned page images that may have been d
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
