File:Frazer1914 fig05.jpg

Fig. 5. 0n the left, two schemes to show the relations between the recess and the mental extension (mental plate)

Represented in transverse section. In the upper figure the plate is separated from the recess by thick condensation, but in lower figure the mental extension is longer and more nearly in contact with the recess, with thinned out mesenchyme intervening. Note the correspondence between the extremity of plate and bottom of tympanum. The right-hand figure represents the separated meatal plate. a, concavity receiving manubrlum; b, edges passing round manubrium to reach wall of recess; c, flat lower part applied to wall of recess below level of manubrium.

Fig. 5 shows schematically the application of the meatal extension to the floor of the recess, and in the same figure is given a sketch of the extension to exhibit its general shape. Its inner part is a solid plate of epithelial cells—the meatal plate—and is practically flat at its extremity, but higher up it is concave Where it receives the manubrial mass which separates it from the floor of the recess; it is at the edges of this concave portion that the growth inwards takes place towards the floor.

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Reference

Frazer JE. The second visceral arch and groove in the tubo-tympanic region. (1914) J Anat Physiol. 48(4): 391-408. PMID 17233005

Cite this page: Hill, M.A. (2024, April 27) Embryology Frazer1914 fig05.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Frazer1914_fig05.jpg

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