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File:EB1911 Reptiles - Evolution of the Ossicular Chain of the Ear.jpg

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English: Diagram showing Evolution of the Ossicular Chain of the Ear. 1. Hyostylic Elasmobranch. H, hyoid; Hm, hyomandible; M, mandible; P Q, palatoquadrate. 2. Lacertilian. Co, columella or stapes; and E, extra-columella with supra-, extra- and infra- “stapedial” processes. 3. Hypothetic stage between 2 and 4. Sphenodon. Par = parotic bone. 5. Lacertilian. Parotic process with a piece of cartilage at its end, remnant of piece of the hyoid; connexion of intra-stapedial process with mandible vanishing. 6. Embryo of Crocodile. Continuous cartilaginous connexion of extra-columella with Meckel's cartilage. 7. Embryonic Mammal; for comparison. Cd, the new condyle, articulating with Sq, squamosal; Cor, coronoid process; quadrate transforming into tympanic ring.
Date published 1911
Source “Reptiles,” Encyclopædia Britannica (11th ed.), v. 23, 1911, p. 161, fig. 37.
Author Hans Friedrich Gadow
Permission
(Reusing this file)
Public domain This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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current21:04, 29 October 2019Thumbnail for version as of 21:04, 29 October 2019831 × 444 (79 KB)Bob Burkhardt{{Information |description ={{en|1=Diagram showing Evolution of the Ossicular Chain of the Ear. 1. Hyostylic Elasmobranch. H, hyoid; Hm, hyomandible; M, mandible; P Q, palatoquadrate. 2. Lacertilian. Co, columella or stapes; and E, extra-columella with supra-, extra- and infra- “stapedial” processes. 3. Hypothetic stage between 2 and 4. ''Sphenodon''. Par = parotic bone. 5. Lacertilian. Parotic process with a piece of cartilage at its end, remnant of piece of the hyoid; connexion of intra-s...

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