Veterinary obstetrics, including the diseases of breeding animals and of the new-born . pletely separ-ate the oral and nasal cavities so that the latter finally openposteriorly, through the posterior nares, into the pharynx. The upper lip is formed by a fusion of the fronto-nasal pro-cesses with the maxillary arch. Aberrations in the developmentof the anterior nares and upper lip are not rare, especially in bo-vidse, where, in some instances, the processus globulares fail tofuse with the maxillary processes, constituting hair lip (Schisto-cephalus fissilabrus). In other instances as in Fig, 34
Veterinary obstetrics, including the diseases of breeding animals and of the new-born . pletely separ-ate the oral and nasal cavities so that the latter finally openposteriorly, through the posterior nares, into the pharynx. The upper lip is formed by a fusion of the fronto-nasal pro-cesses with the maxillary arch. Aberrations in the developmentof the anterior nares and upper lip are not rare, especially in bo-vidse, where, in some instances, the processus globulares fail tofuse with the maxillary processes, constituting hair lip (Schisto-cephalus fissilabrus). In other instances as in Fig, 34, fis-sion on the median line through the fronto-nasal process occurs,so that the maxilla is divided, with the mandible curved up- 298 Veterifiary Obstetrics ward between the two lateral halves, to constitute schistoceph-alus bifid us. In dealing with diseases of the septum nasi, its origin shouldalways be recalled and it should be remembered that, in someforms of disease, fluids may collect or new tissues may develop be-tween the two laminre, from which the septum takes its Fig. 35. CivKFT Pakath:. Foal. (From photograph). In some these margins fail to and result in a cleftpalate, as shown in Fig. 35. In other instances the fusion ex-tends too far backward , passing across the pharynx, com-pletely separates the nasal chamber from the mouth and pharynx,constituting atresia of the nares, by which arrest indevelopment the animal is unable to breathe through the nostrilsand must respire entirely through the mouth. With the greatlyelongated soft palate of the , which renders oral breathingextremely difficult, the animal can not live if both posterior nares areclosed, while, if the atresia affects but one nostril, the animalcan breathe readily when not .severely exerted, but, if put tohard work, shows extreme dyspnoea as a result of the restrictedbreathing room. The Eyk. The eyes originate partly from the optic vesicles of the brainand part
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectveterinaryobstetrics
