During the past year Guggenheim1 wrote an illuminating article on the development of the stapes, in which he showed that the footplate of the stapes is really derived from the labyrinthine capsule and not from Reichert's cartilage as heretofore generally believed. In the human embryo of 5 weeks the labyrinthine capsule is composed of condensed mesenchyma and has no oval or round windows. At 7 weeks the precartilage is better formed and the capsule shows a deep indentation near the stapedial ring, but there is as yet no gap in the capsule. The perichondrium is plainly seen to be continuous over this area. At 9 weeks Reichert's cartilage forms a complete ring round the stapedial artery and indents the labyrinthine capsule, but the perichondrium is still unbroken under the ring. At 11 weeks the entire capsule is cartilaginous except at the internal auditory meatus and just
DICKIE JKM. Progress in Otolaryngology: A Summary of the Bibliographic Material Available in the Field of Otolaryngology: CHRONIC PROGRESSIVE DEAFNESS, INCLUDING OTOSCLEROSIS AND DISEASES OF THE INNER EAR. Arch Otolaryngol. 1932;15(6):913–928. doi:10.1001/archotol.1932.03570030935011
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