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STAPES, FISSULA ANTE FENESTRAM AND ASSOCIATED STRUCTURES IN MAN: III. FROM EMBRYOS 6.7 TO 50 MM. IN LENGTH

1942; American Medical Association; Volume: 36; Issue: 6 Linguagem: Inglês

10.1001/archotol.1942.03760060131008

1538-361X

Earl W. Cauldwell, Barry J. Anson,

Phonetics and Phonology Research

In earlier articles 1 the major steps in the rapid embryologic development of the stapes and those in the slower alteration of postnatal specimens were described and illustrated, selected stages between 7½2 weeks (22.8 mm.) and 70 years being utilized; the morphologic aspects of the closely related vestibular rim and fissular prolongation were considered at the same time. In the present phase of the investigation a more inclusive and numerically larger set of stages is being studied, ranging between that of the embryo 6.7 mm. in length and that of an adult aged 75 years. By this means, detailed information on the morphogenesis and increment will be added, and hiatuses in present knowledge of stapedial form will be closed. The current article will carry the stapedial history through stages at which the cartilage has assumed definitely stirrup-shaped form; subsequent articles will account separately for equally crucial morphogenetic epochs. MATERIAL AND