. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. SKULL 127 sphenoid, as already mentioned, or may be due to a union of the basal parts of the two orbitosphenoids. Alisphenoids, as well as a basisphenoid, a basioccipital, a supraoccipital, and exoccipitals (often with paroccipital or paramastoid processes) are always present, the paired condyle x being furnished by the exoccipitals (Fig. 92). A'arial fenestra Preitiax. Basal fenestra Paraseptal cart. Nasal caps. Vomer Splteneth. cart. Orbitonas. fissure Meckel's cart. __ Ala temp, (alisplt.) Malleus Carotid for. Max. ...
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. SKULL 127 sphenoid, as already mentioned, or may be due to a union of the basal parts of the two orbitosphenoids. Alisphenoids, as well as a basisphenoid, a basioccipital, a supraoccipital, and exoccipitals (often with paroccipital or paramastoid processes) are always present, the paired condyle x being furnished by the exoccipitals (Fig. 92). A'arial fenestra Preitiax. Basal fenestra Paraseptal cart. Nasal caps. Vomer Splteneth. cart. Orbitonas. fissure Meckel's cart. __ Ala temp, (alisplt.) Malleus Carotid for. Max. ... Jugal — Pal —0- 0 1 P ; (parasph.) ~ 9 Tympanic Squamosal Fen. cochlea Jug. for. - Mypoglostal for. for. may. Tect. synot. FlG. 91, IJ. The enlargement of the cranial cavity in correspondence with the increased size of the brain affects the form of the skull in various respects. Thus the supraoccipital becomes shifted 1 The presence of two condyles appears at first sight to form an important difference to Reptiles, and this is the more remarkable as the occipital region has a similar primary constitution in both groups and differs from that of Amphibians. But in the case of the Sauropsida there axe four points of connection between the occipital and the vertebral column. The single condyle is usually formed of three parts (p. Ill), the median or axial of which articulates parti}' with the centrum proper of the atlas and partly with the odontoid process, with which it is connected by ligament. In Mammals, the lateral articulations are alone developed, and in the Mole embryo there is a single continuous articulation between the skull and vertebral 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 Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan
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