Paper - The Development of the Scala Tympani, Scala Vestibuli and Perioticular Cistern in the Human Embryo
Embryology - 26 Apr 2024 Expand to Translate |
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Streeter G.L. The Development of the Scala Tympani, Scala Vestibuli and Perioticular Cistern in the Human Embryo
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The Development of the Scala Tympani, Scala Vestibuli and Perioticular Cistern in the Human Embryo
Department of Embryology, Carnegie Institution of Washington, Johns Hopokins Medical School, Baltimore, Maryland
Nine Figures
The study of the development of the large walled—off connective tissue spaces that surround the membranous labyrinth
is particularly interesting in that it shows that they have a very
definite morphological individuality. It is evident at least
that they are not to be considered as insignificant accessories
that merely fill in the waste intervals between the membranous
labyrinth and the surrounding cartilage or bone. On the contrary, they have characteristics which are in many respects
as definite and constant as ‘those of the ossicles themselves. The
individuality of these spaces in all respects is most marked.
They make their appearance at a definite stage in the development of the embryo; they are formed at definite places; they
pass through a series of definite histogenetic processes; they
spread in a definite order and manner and eventually they attain a definite form and structure. The general morphology
and relations of these‘ spaces during their developmental period
will be described in the following paper, and the opportunity
will be taken to point out in the course of the description some
of these individualistic features.
Instead of designating the large spaces surrounding the membranous labyrinth as perilymphatic spaces, as has been the
general custom since the time of Breschet 1833, they will here
be spoken of as perioticular or periotic spaces. The use of the
term ‘periotic’ avoids the confusion arising from the incorporation
of the Word ‘lymphatic’ in the terminology. The present tendency is to restrict the use of the word ‘lymphatic’ to the lymphatic vascular system and its associated structures, with which
these particular spaces have no known connection, either in
their origin or in their ultimate relations.1 We shall therefore
speak of a periotic connective tissue that everywhere surrounds
the epithelial portion of the labyrinth. This connective tissue
includes, in part the fine-meshed periotic reticulum, and in
part the large walled-off perioticular spaces to which belong the
vestibular cistern, the scala Vestibuli and the scala tympani
with whose development we are primarily concerned. V
Material and Methods
The observations that are recorded in this paper are all based on human embryos and cover the period included between embryos 35 mm. and 130 mm. CR length, which is approximately equivalent to the period between the ninth and sixteenth week of fetal life.
To facilitate the determination of the form and relations of the spaces, wax-plate models of the membranous labyrinth and the surrounding spaces were reconstructed after -the Born method. Advantage was taken of the improvements in the method recently devised by Lewis 1915.9 The serial sections were photographed at a suitable enlargement on bromide paper. By means of a preliminary model of the membranous labyrinth, the necessary reconstruction lines were established and inscribed on the bromide prints. From these prints then the membranous labyrinth and the perioticular spaces were traced on waxplates. After cutting out from the plates the areas corresponding to these structures, the plates were piled and the resultant cavities were filled with plaster of Paris. The wax was finally melted off and there was left then a permanent plaster cast of the objects desired at a definite enlargement. Views of these models are shown in figures 4 to 9.
In outlining the periotic spaces it was found necessary to
‘Sabin, F. R. Harvey Society Address. Science, vol. 44, 1916, p. 145. 9 Lewis, W. H. The use of guide planes and plaster of Paris for reconstructions from serial sections. Anat. Rec., vol. 9, 1915.
Cite this page: Hill, M.A. (2024, April 26) Embryology Paper - The Development of the Scala Tympani, Scala Vestibuli and Perioticular Cistern in the Human Embryo. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_The_Development_of_the_Scala_Tympani,_Scala_Vestibuli_and_Perioticular_Cistern_in_the_Human_Embryo
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