. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. BRAINCASE, BASIGRANIAL AXIS, MEDIAN SEPTUM IN THE DINOCEPHALIA 225 bounded by the following bones: exoccipital, supraoccipital, opistothotic, prootic and orbitosphenoid. The roof to the brain is formed by the supraoccipi- tal, frontal, and orbitosphenoid. Internally the openings for the hypoglossal, the foramen jugulare and the internal auditory meatus lie low down on the sidewall at floor level. The upper part of the dorsum sellae is formed by the prootics meeting each other in the median line. The
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. BRAINCASE, BASIGRANIAL AXIS, MEDIAN SEPTUM IN THE DINOCEPHALIA 225 bounded by the following bones: exoccipital, supraoccipital, opistothotic, prootic and orbitosphenoid. The roof to the brain is formed by the supraoccipi- tal, frontal, and orbitosphenoid. Internally the openings for the hypoglossal, the foramen jugulare and the internal auditory meatus lie low down on the sidewall at floor level. The upper part of the dorsum sellae is formed by the prootics meeting each other in the median line. The lower part of the dorsum sellae is formed by the basisphenoid. The IVth nerve lies high—at the root of the parietal organ. The orbitosphenoid is a small bone intercalated between the frontals in the median line and forms part of the roof of the rhienecphalon. In its upper part the orbitosphenoid posteriorly encloses the olfactory lobes, and further forward forms a pair of tubes to house the tracti olfactorii and anteriorly the septosphenoid forms grooves opening laterally to house the olfac- tory bulbs. The lower part of the sphenoid complex forms a median septum and this part would appear to be composed of a septosphenoid and a presphenoid resting on the upper edge of the parasphenoidal rostrum. The parietal tube is large with a height of 130 mm. Its sides are irregular with diameters varying from 16 to 34 mm. The basicranial axis (Fig. 23) The basicranial axis is formed by the firmly united exoccipitals, basioccipi- tal and the fused parabasisphenoid. In ventral view it is evident that the fenestrae ovales lie very close to the median line. Only the posterior part of the interpterygoid vacuity is patent with the result that the parasphenoidal rostrum is obscured by the pterygoids meeting in the median line. The parabasisphenoid is firmly joined to the epipterygoid and the footplate of the epipterygoid but, though immovable, the old basiptery-. Please note that these images
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
