Human physiology : designed for colleges and the higher classes in schools and for general reading . tooth-likeprocess, around which the first vertebra rotates, carrying theskull with it. You see it is smaller at its root than at its smaller part is bound firmly by the ligament in the first THE BONES. 187 Arrangement of first and second verteline. vertebra. It is shaped thus to prevent its slipping out from theligament. J, J, are the two surfaces on which the first verte-bra moves as it rotates around the tooth-like process. Fig. 97shows the two bones together, the tooth-like process
Human physiology : designed for colleges and the higher classes in schools and for general reading . tooth-likeprocess, around which the first vertebra rotates, carrying theskull with it. You see it is smaller at its root than at its smaller part is bound firmly by the ligament in the first THE BONES. 187 Arrangement of first and second verteline. vertebra. It is shaped thus to prevent its slipping out from theligament. J, J, are the two surfaces on which the first verte-bra moves as it rotates around the tooth-like process. Fig. 97shows the two bones together, the tooth-like process being con-fined in the ring of the upper bone. Special pains are taken tomake this arrangement secure, that the process may not bein danger of pressing upon the spinal marrow at this importantpoint. It is thus that the lateral rotary motion of the head andthe forward and backward motion are secured by two joints,just as is done in the mounting of a telescope. The differencebetween the two cases is, that in the mounting of the telescopethere are no difficulties to overcome, while in arranging the. FIRST VERTEBRA. FIG. 96. PIG. 97.
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Keywords: ., bookauthorhookerwo, bookcentury1800, bookdecade1850, bookyear1854
