On the operative treatment of hare-lip / by W.I. Wheeler.

  • Wheeler, W. I. (William Ireland), 1846-
Date:
1880
Catalogue details

Licence: Public Domain Mark

Credit: On the operative treatment of hare-lip / by W.I. Wheeler. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    80140 Pr°ce$$. ii , I°Ces«'tliei nK',re “SaT® 0'4 ella. The f part inng in •tt the middle, on whose r; and, according to Mr. so developed in themem* this internasal cartilage.1 the internal nasal process, n<r of the nostril. From 0 here is continued dom- ithe different parts of the , and whose foremost part ^ofthenaealaM process over the nos* eD'n=' , „1 visceral j the first post-on1 v f inva?a3ll(JU',*l'ie^i ffeenthe» # dduct* . uui_ bar] by | ,.. 4iUtflD=’. „ jhel?eJ )»b flii| myj$» tor O 03 go c era rk n> ^r- o 3 r r/i o 3. <T> O o fD B era a H) Vi pi 2, cu 17. 3 o- IX) By Mr. Wheeler. 5 cavity on cacli siele of the middle or septal nasal pioccss, hecome shut off from the mouth. This process of shutting off begins before the end of the second week, and from about the eighth week these palatal lamellce blend or coalesce from before backwards, joining with the lower edge of the septum narium.a In the ninth week the hard palate is completed in the human foetus, and the lateral soft lamella? posteriorly, which afterwards form the soft palate, rapidly coalesce, so that by the second half of the third month the velum is formed, and the uvula has appeared. The nasal bones arise as splints on the front part of the skull above the union of the internal and external nasal processes; the lachrymals cover the space above the union of the maxillary and external nasal processes, and these ossify at the beginning of the third month, thus being, as it were, marginal splints of the ethmoid. The human premaxilla? arise, as has been already stated, as splint bones on each side of the lower part of the middle nasal process, but join very early to the maxillae, which form as splints on the sur- face of the maxillary processes. In embryos of the first half of the third month the premaxillas are separate from the maxillae, except on the facial surface, where the latter overlap them. During the eleventh and twelfth weeks union proceeds rapidly on the lateral and anterior aspects, so that only a fissure on the palatine side indicates the separation of these bones. This fissure may persist even in adolescent skulls, and may be found widely gaping in the cases of double hare-lip, with the “ wolf’s pharynx,” in which the upper maxillary palatine processes remain separate, not only from the pre- maxillas, but from the middle nasal process. And hence the incisor teeth (which develop in the premaxillas) appear in a median piece of bone attached to the internal nasal process, quite separate from the lateral palatine process of the maxilla?. Mr. Bryant relates an n It is interesting to notice that in different animals the degree of blending of these processes medially is a variable one ; thus in the human and many other embryos the lateral palatal lamella; of the superior maxillary process unite with each other below the nasal septum which comes in contact with them above, while in whales the septum which retains its embryonic breadth projects on the roof of the mouth between the two palatal lainellte.
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