Exercises in equine surgery . eter behind the glosso-facial artery;divide the skin, the cutaneous muscle and use precaution indiissecting the adjacent connecting tissue layers. Tlie ductappears below as a narrow flat white cord. It has only tobe isolated and tied; at the same time avoid Avounding thevein. Ll(/atiou heJiind the maxilla.—At one to two centimetersbehind the ascending branch of the maxihary, near the inferiorangle of the parotid and on a line with the sterno-maxillaris,make an incision of three or four centimeters through the skinand cutaneous nuiscle in a gradually oblique direct
Exercises in equine surgery . eter behind the glosso-facial artery;divide the skin, the cutaneous muscle and use precaution indiissecting the adjacent connecting tissue layers. Tlie ductappears below as a narrow flat white cord. It has only tobe isolated and tied; at the same time avoid Avounding thevein. Ll(/atiou heJiind the maxilla.—At one to two centimetersbehind the ascending branch of the maxihary, near the inferiorangle of the parotid and on a line with the sterno-maxillaris,make an incision of three or four centimeters through the skinand cutaneous nuiscle in a gradually oblique direction down-ward and forward; continue cautiously by dividing the cellularlayer in which the duct is located; lay it bare, isolate, andligate. AI.~TREPHIN1NG. Restraint.—Cast the animal on the side opposite to tliat onwhich you wisli to operate. Hold the head in extension uponthe neck. Twitch the upper lip. Remove the bridle or halter. TREPHINING. 83 Instruments.—Bistoury, forceps, raspitory, trephine, long ofparing Fig. il.—Head, anterior face; SF, frontal sinus. 1.—Trepliiuiiig- the Frontal Sintises. Trephine the frontal sinuses between the internal angle oftlie eye and the median line at equal distances from these twopoints. 84 EXERCISES IN EQUINE SURGERY. Technique.—First step: A V-shaped incision and dissectionof the narrow cutaneous strip.—Make two oblique incisionsdownward and forward. They should converge and unite attheir inferior extremity. With the forceps and straight bis-toury, dissect the narrow cutaneous strip and also its bound-
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