. A system of surgery (Volume 2) . , and twofquamous. The coronal future extends over thehead, from within a fhort fpace of the external can-thus of one eye to within an equal diftance of the oth-er on the oppofite fide of the head : and in its comfcit ferves to unite the frontal bone to the anterior edgeof the two parietal bones. The fagittal future unitesthe parietal bones on the fuperior part of the fkull, byrunning almoft in a direct line from the middle of thefrontal bone to the middle of the os occipitis : Infome inftances this future proceeds along the wholeextent of the os frontis, and
. A system of surgery (Volume 2) . , and twofquamous. The coronal future extends over thehead, from within a fhort fpace of the external can-thus of one eye to within an equal diftance of the oth-er on the oppofite fide of the head : and in its comfcit ferves to unite the frontal bone to the anterior edgeof the two parietal bones. The fagittal future unitesthe parietal bones on the fuperior part of the fkull, byrunning almoft in a direct line from the middle of thefrontal bone to the middle of the os occipitis : Infome inftances this future proceeds along the wholeextent of the os frontis, and terminates immediatelyabove the nofe, by which that bone is divided into twoequal parts ; and it has been faid that inftances haveoccurred of the occipital bone being divided iq a fim-ilar manner. This, however, is confefTedly a rare oc-currence. The lambdoid future, fo called from its refemblanceto the Greek letter A, begins where the fagittal futureterminates, at the middle of the fuperior edge of the oc* cipital I I. \ I I \\\. !• i o ; Se&. II. from External Violence. 123 cipital bone; and its two crura or legs flretching downto the bafis of the fkull, ferve to unite this bone to thepofterior edge of the two parietal and temporal is in the courfe of this future, namely, the lambdoidfcthat thefe fmall irregular offifications, termed offa tri-quetra, are mod commonly met with. In fome in-fiances they penetrate the whole thicknefs of the bone jbut in others, they are chiefly confined to the exter-nal lamellae of the fkull, being fcarcely to be obfervedinternally. The lafl futures we have to mention are the twofquamous, which ferve to unite the fuperior part ofthe temporal bones to the under and correfpondiagparts of the offa parietalia. In young people thefe five futures are .almofl uni-verfally met with^rjd it is neceffary that pra£titionersftiould be well acquainted with their direction : butit is proper to obferve, that in older fubje&s fome ofthem are often wa
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