Plastic surgery; its principles and practice . ment {YZ)taken from the level of the opposed corners .4 and A directlydownward, of such length that Z would lie on an imaginary lineKL, which would complete the natural curi-e of the upper lip. Thepoints of the compasses are now fixed apart at this distance {YZ) andmeasurements are taken in the hp on each side of the cleft (shown in2) commencing at A and A respectively and passing to B and B. Thepoints B and B are each close to the junction of the skin with the redline of mucous membrane, and are so placed that AB is equal in lengthto AB and each
Plastic surgery; its principles and practice . ment {YZ)taken from the level of the opposed corners .4 and A directlydownward, of such length that Z would lie on an imaginary lineKL, which would complete the natural curi-e of the upper lip. Thepoints of the compasses are now fixed apart at this distance {YZ) andmeasurements are taken in the hp on each side of the cleft (shown in2) commencing at A and A respectively and passing to B and B. Thepoints B and B are each close to the junction of the skin with the redline of mucous membrane, and are so placed that AB is equal in lengthto AB and each one is the same length as YZ. The points B and Bare permanently iLxed by pricking the skin with the points of the com-passes until the blood appears. The compasses are now readjusted and a measurement BC is taken,the point C being on the free margin of the lip. The angle which BCmakes with AB is usually about 60° but varies somewhat. It mustalways be less than 90°. if a projecting prolabium is to result from the HARELIP AND CLEFT PALATE 265. silkworm. Fig. 225.—Operation for single complete harelip (Neu-).— The calipers deter-mining the length of the incisions to be made. The dotted lines indicate the incisions whichterminate at the vermilion line and which are of equal length on each side. B. The muco-cutaneous margins have been pared and the lip has been thoroughly freed from the boneon each side. The small clamps on either side of the lip are to control bleeding. C. Thefirst silkworm gut suture to form the nostril is inserted from the inside and does not pene-trate the skin. D. The first silkworm gut suture is tied and the second is placed. E. Theskin is approximated with horsehair. 266 PLASTIC SURGERY completed operation. A similar point C is taken on the other side ofthe cleft. Both C and C are pricked with the points of the now ready to denude the sides of the cleft the operator passes a F
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