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FRANZ ALTMANN, M.D.

Arch Otolaryngol. 1950;52(5):725-766.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

INNER EAR

Membranous Labyrinth.—The first anlage of the membranous labyrinth becomes visible at a very early stage. Sometimes in embryos with only two to three somites (Wilson, 1914; Ingalls, 1920; Bartelmez, 1922) a thickening of the ectoderm is seen on either side of the still open neural plate in the region which later becomes the hindbrain. This thickening becomes more prominent in the six to nine somite (2 mm.) stage; it is called the auditory placode. According to Groth's observations (1939) on the guinea pig, the placode is derived from the so-called lateral ridge (Seitenwulst) of the neural plate.

In embryos with 14 to 15 somites the center of the placode sinks into the underlying mesenchyme, and a depression, the otic pit, is formed. The pit soon deepens, assumes a vesicular shape and becomes the otic vesicle, or otocyst. For a short time it remains in open communication with the . . . [Full Text PDF of this Article]

Author Affiliations
NEW YORK

From the Department of Otolaryngology, Columbia University College of Physicians and Surgeons.

Footnotes
This study was supported by a grant from the Hayden-Coakley Fund.

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