. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. CRANIUM. 741 of the sphenoid bone vertically) at once per- ceive the same analogy to exist. If, when they are thus placed, we look at the cerebral surface, we shall recognize the body in that of the sphenoid ; the vertebral plates in the small wings of the sphenoid, and two halves of the frontal bone; the foramen in the space cir- cumscribed by these last; the transverse processes in the two great wings of the sphe- noid ; and the notches in the lacerated orbitar foramina, and the angles between the body of the sphenoid
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. CRANIUM. 741 of the sphenoid bone vertically) at once per- ceive the same analogy to exist. If, when they are thus placed, we look at the cerebral surface, we shall recognize the body in that of the sphenoid ; the vertebral plates in the small wings of the sphenoid, and two halves of the frontal bone; the foramen in the space cir- cumscribed by these last; the transverse processes in the two great wings of the sphe- noid ; and the notches in the lacerated orbitar foramina, and the angles between the body of the sphenoid and posterior margin of its great wings. If we look at it in front, it will not require any great stretch of the imagination to recognize the four articulating processes in the pterygoid processes of the sphenoid bone and the external angular processes of the frontal. The temporal and the parietal bones toge- ther represent another vertebra, situated be- tween the former two. By looking at the base of the skull held vertically, and abstract- ing in the mind the occipital bone, we can (under favour of the license allowed to, or taken by anatomists) see in the two petrous portions of the temporal bones, if they were brought into contact, a type of the body of a vertebra; and in those parts of them which contribute to form the anterior and posterior lacerated foramina, we observe a resemblance to those notches which form in the vertebra, as they do here, conjugal foramina. The arti- cular eminences of the temporal bones give us no bad notion of the transverse processes, while the zygomatic processes above (still holding the skull vertically) and the part which projects behind the mastoid processes below, will indicate the four oblique or arti- culating processes. Lastly, the squamous pro- cesses of the temporal and the whole of the parietal bones represent the vertebral plates, and the space enclosed by them, the vertebral foramen. Development of the cranial bones. — The progre
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