. Manual of operative veterinary surgery. Veterinary surgery. HYOYEETEBKOTOMY. 457 In respect to glanders, moreover, the bad odor, the thick, gru- mous nasal discharge, and the soreness and dullness on percussion of certain parts of the face, will in many cases serve to identify and distinguish a pathological condition of the sinuses very dif- ferent from that of the disease we are considering. Gohier and Vatel also refer to guttural tympanitis, or dilatation of the pouches by air, as a feature of their disordered condition. The amount of pus collected in the pouches varies in different oases
. Manual of operative veterinary surgery. Veterinary surgery. HYOYEETEBKOTOMY. 457 In respect to glanders, moreover, the bad odor, the thick, gru- mous nasal discharge, and the soreness and dullness on percussion of certain parts of the face, will in many cases serve to identify and distinguish a pathological condition of the sinuses very dif- ferent from that of the disease we are considering. Gohier and Vatel also refer to guttural tympanitis, or dilatation of the pouches by air, as a feature of their disordered condition. The amount of pus collected in the pouches varies in different oases to such an extent that from only a trifling degree of dilatation it may be suf- ficiently extensive to produce a sensible projection of the sac below the parotid. This dilation furnishes a gmde for the determination of the proper point at which to make the puncture, whether in the upper, in the middle, or in the lower part of the pouches. The upper operation is hyovertebrotomy proper. Besides these three modes of operation, Gunther has proposed a fourth method which consists in penetrating the pouches through the nasal cavities. Upper operation—Hyovertebrotomy proper.—As described by Chabert and Fromage de Feugre, this is one of the finest and most delicate operations of veterinary surgery. Extremely so when per- formed on horses whose pouches are healthy and normal in size, it loses a great deal of its apparent difficulty when these are fuU of pus with prominent and well developed walls. The nerves and blood vessels which surround them are then easily pushed aside from their position, and the lobules of the parotid are more or less separated. The instruments required for this operation are: a pair of scissors, a convex and a straight bistoury, a dissecting forceps, an. Fig. 398.—Curvod Trocar, or Hyoverteteotome. S probe, or preferably, the curved trocar, the hyovertebrotome (Fig. 398), and a piece of tape. Artery forceps and ligatures ought to be always within reach. Bo
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