. Human physiology : designed for colleges and the higher classes in schools, and for general reading. them with the intervening cartilaginous coatings, greatelasticity, and vast variety of motion, especially in the hand. 273. I will notice with some particularity some of thebones, of which I have given a general description, as they areunited together to form the whole skeleton. I can not noticethem all, nor dwell upon every point of interest, for this wouldrequire much more space than I can devote to the subject. Ishall, therefore, select those points which can be made mostclear and interest
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. them with the intervening cartilaginous coatings, greatelasticity, and vast variety of motion, especially in the hand. 273. I will notice with some particularity some of thebones, of which I have given a general description, as they areunited together to form the whole skeleton. I can not noticethem all, nor dwell upon every point of interest, for this wouldrequire much more space than I can devote to the subject. Ishall, therefore, select those points which can be made mostclear and interesting. 274. I first call your attention to the bones of the head, asyou see them in Fig. 87. There are twenty-two bones in thewhole head. Fourteen of these belong to the face, while eightbelong to the cranium, that is that part of the skull which in-closes the brain. Of these, notice particularly the large bonein front called the frontal bone, a, making the forehead, andbelow forming the upper portion of the orbits of the eyes;the parietal bone, b, the upper lateral part of the dome of the FIG. BONES OF THE HEAD. 176 HUMAN PIIYSIOLOGY. Why so many bones in the skull. The two tables, and the sutures. skull; and c the temporal bone on which the parietal bonorests. There is a large bone in the rear forming the back ofthe cranium as the frontal bone does the front. There arealso two bones in the base of the cranium which are out ofsight in this view of the skull. You may, perhaps, be disposedto inquire why this box for holding the brain, should be madeof so many bones. One reason is, that the enlargement of theskull from infancy to adult age is effected more easily andbetter than it would be if the cranium were one bone. Anotherreason is, that even in the adult, in whom these bones are atlength so tightly united, violence is less apt to produce injury,from the giving, as it is expressed, of the bones upon eachother, than it would be if one bone made the whole this
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