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STAPES, FISSULA ANTE FENESTRAM AND ASSOCIATED STRUCTURES IN MAN: IV. FROM FETUSES 75 TO 150 MM. IN LENGTH

1943; American Medical Association; Volume: 37; Issue: 5 Linguagem: Inglês

10.1001/archotol.1943.00670030664005

1538-361X

Barry J. Anson, Earl W. Cauldwell,

Head and Neck Anomalies

In continuing a comprehensive study of the stapedial region of the human ear, special attention has been given to the stapes, the vestibular window and the associated fissular tracts in developmentally important embryonic and fetal stages. In a preceding article 1 the steps in morphogenesis were traced as encountered in specimens from 6.7 to 50 mm. in crown-rump length; the current article carries the account through the 150 mm. specimen, at which stage the formation of bone is initiated in the stapes. Both of the contributions just referred to serve to fill hiatuses existing in two more general papers on stapedial, fissular and fenestral anatomy. 2 MATERIAL AND METHODS For this stage of the investigation reconstructions of the stapes, together with the surrounding area, were prepared by the wax plate method of Born. 3 Representative developmental stages were selected for reconstruction at approximately 25 mm. intervals, while comparable or additional anatomic features in