. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 364 ANNALS OF THE SOUTH AFRICAN MUSEUM maxillary ramus probably continued along the groove (Fig. 18, CRMAXV) on its surface, just above the level of the quadrate ramus of the pterygoid, until it reached the ganglion Gasseri lying within the foramen (Fv) between the epiptery- goid and prootic (Figs 1, 16A). The abducent nerve probably followed much the same course as the palatine ramus of the facial nerve and entered its foramen (Fig. 6A, Fvi) anterior to and below the foramen for the former. The geni
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 364 ANNALS OF THE SOUTH AFRICAN MUSEUM maxillary ramus probably continued along the groove (Fig. 18, CRMAXV) on its surface, just above the level of the quadrate ramus of the pterygoid, until it reached the ganglion Gasseri lying within the foramen (Fv) between the epiptery- goid and prootic (Figs 1, 16A). The abducent nerve probably followed much the same course as the palatine ramus of the facial nerve and entered its foramen (Fig. 6A, Fvi) anterior to and below the foramen for the former. The geniculate ganglion of the facial nerve (VII) probably lay in the posterior part of the fora- men between the epipterygoid and the prootic, in a recess under the prootic. After entering its foramen the palatine ramus of the facial nerve had only to run directly upwards for a very short distance before joining its ganglion. Basisphenoid and parasphenoid (Figs 1, 6, 15B-16A, 17A-19B, 20, 21C, 22B, 25A, 28, 29A) Sectioning revealed no more information than that given by Olson (1944) and Parrington (1946), and that given above under the section on the pterygoid. An unossified zone is present between the basisphenoid and basioccipital (Figs 1, 6A, 16A, 19A, 20, UZ). The parasphenoid is well developed laterally. Earlier preparation of the sectioned skull exposed the basicranium so that it is not possible to be sure exactly how far the parasphenoid extends backwards on the ventral surface. It does not cover the unossified zone and the anterior part of the basioccipital, but this may be due either to damage or to the fact that the specimen is fairly young (Fig. 1, WPS).. Fig. 20. Transverse section through braincase and lower jaw showing rela- tionship between epipterygoid and prootic, abducent foramen (see also Figs 21C and 24A), and unossified zone in basicranium. x 1,5. In ventral view the wings of the parasphenoid do not extend as far laterally towards the fenestra ovalis as they are f
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
