The Columella Auris in Amphibia: Second Contribution (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from The Columella Auris in Amphibia: Second Contribution

Below and beneath the squamosum, filling in the space between otic capsule, squamosum and otic process of the palatoquadrate, and extending down upon the outer side of the vena petroso - lateralis to the yolk - bearing cells occupying the site of the future membrane, is a dense tissue, with numerous cells and homogeneous matrix, which embodies the proton of the columella, stilus and squamoso - columellar ligament. The derivation of these cells was not definitely deter mined. Younger embryos lend some support to the View that they migrate down around the vein. The different appearance of the cells of the otic capsule adjoining the lower end of this cell - group argues against their origin from this portion of the otic capsule (membrane or floor).

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