Archive image from page 921 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 Skull of a young Ostrich ( Strut hio Camelus). palatine bone and that which supports the lower jaw (26). In Reptiles they are large and important detached bones, occupying the po- sition of the pterygoid processes of the sphe- noid ; but in Birds and Mammals they become completely anchylosed with the sphenoid, so that, by the human osteologist, they are erro- neously regarded as apophyses of that bone. Section of skull of young Ottrich. The zygomatic, Owen,
Archive image from page 921 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 Skull of a young Ostrich ( Strut hio Camelus). palatine bone and that which supports the lower jaw (26). In Reptiles they are large and important detached bones, occupying the po- sition of the pterygoid processes of the sphe- noid ; but in Birds and Mammals they become completely anchylosed with the sphenoid, so that, by the human osteologist, they are erro- neously regarded as apophyses of that bone. Section of skull of young Ottrich. The zygomatic, Owen, (jiigal, Cuvier,) are in Fishes broad pieces, generally of a triangular shape, placed behind the transverse, which by their inferior angle support the articulation of the lower jaw. In Reptiles, too, it may al- ways be distinguished by the latter circum- stance, and in Serpents it is particularly re- markable (Jigs. 438, 439, 26), standing out from the squamo-temporal (mastoid, Cuv.) like a branch, and thus giving that extraor- dinary mobility to the articulation of the in- ferior maxilla which enables those Reptiles to swallow prey so disproportioned to the size of their mouths. In other Reptiles this mobility is in a great degree lost. But in Birds the zygomatic bones again assume very important functions. They are here known by the name ossa quudrata, and standing out to a con- siderable distance from the skull allow of great mobility to the zygomato-maxillary articulation, and also to the bones supporting the superior maxilla. In Mammalia this zygomatic bone is so firmly and undistinguishably united to the temporal that the human osteologist merely calls it the zygomatic process of that bone. The ma&to-temporal, Owen, (temporal, Cuv 23), are in Fishes and Reptiles distinct elements of the skull, which in the human cranium are consolidated with the other elements com- posing the ' os tewporis.'
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