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Updated: May 19, 2025
Congenital fistulæ, such as occur in the neck from imperfect closure of branchial clefts, or in the abdomen from unobliterated fœtal ducts such as the urachus or Meckel's diverticulum, will be described in their proper places.
Our circulation begins as a veritable fish circulation; our earliest skeleton is a notochord; Meckel's cartilage, from which our lower jaw and the bones of our middle ear develop, is a whole genealogical tree of disagreeable ancestors. Our glandula thyreoidea has, according to good authorities, an origin so slimy that it should never be mentioned in polite society.
Thomka in 1895 reported a case of supernumerary tympanic ossicle, the nature of which was unknown, although it was neither an inflammatory product nor a remnant of Meckel's cartilage. Absence of the Limbs. Those persons born without limbs are either the subjects of intrauterine amputation or of embryonic malformation.
"I think there is nothing in my appearance to enrage the king. I have laid rouge heavily upon my cheeks, and, thanks to Meckel's prescription, my eyes are as brilliant as if they had shed no tears. If I meet my brother with this friendly, happy smile, he will not remark that my cheeks are sunken. He will be content with me, and perhaps listen to my prayers."
If Meckel's proposition is so far qualified, that the comparison of adult with embryonic forms is restricted within the limits of one type of organisation; and, if it is further recollected that the resemblance between the permanent lower form and the embryonic stage of a higher form is not special but general, it is in entire accordance with modern embryology; although there is no branch of biology which has grown so largely, and improved its methods so much, since Meckel's time, as this.
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