Tranformations in the Facial Region of the Human Embryo by C. Vermeij – Keers

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  • Title: Tranformations in the Facial Region of the Human Embryo
  • Author: C. Vermeij – Keers
  • Category: Medicine
  • Date: December 2012
  • Lenguage: English
  • Pages: unknown
  • ISBN: 3642462928

 

Ebook description:

The human face is invariably fascinating, whilst an object of embryologic evaluation. The early embryonic development processes are situated round the growing sense organs, amongst which the nostril holds a key place. The first indication of the improvement of the nostril is the formation of the placodes, oval areas of thick­ ened and condensed ectoderm, one on all sides of the head. Each of these placodes is remodeled, by way of the nasal groove, into the nasal tube, generally indicated as primitive nasal cavity. In the literature this transformation has been described as an remoted course of that adjustments the superficial facial area. Some authors, together with Wolgensinger (1950), suppose that the energetic element of this trans­ formation primarily is the ectoderm of the nasal placode. Others, i. e. Hochstetter (1891), Kallius (1905) and Vermeij-Keers (1967), assume this element be situated in the mesenchyme. Peter (1913, 1949), Patten (1953, 1961), Warbrick (1960), and Andersen and Matthiessen (1967) maintain each these elements to be energetic. In the first and final of these three ideas the ectoderm of the nasal placode and the nasal groove respectively, is assumed to invade the mesenchyme in the posterior path. Invading ectoderm has additionally been thought-about to kind – impartial of the transformation – the organ of Jacobson and the naso­ lacrimal duct and to separate the conchae (e. g. Born, 1876; Legal, 1883; Kallius, 1905; Peter, 1913, 1949; Streeter, 1948; Andersen and Matthiessen, 1967)

 

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