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XXXV.—The Development of the Auditory Ossicles in the Horse, with a Note on their possible Homologues in the Lower Vertebrata

Published online by Cambridge University Press:  15 September 2014

Ray F. Coyle
Ray F. Coyle
Affiliation:
(From the Zoological Department of the University of Edinburgh.)
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Extract

The discussion as to the homologies existing between the sound-conducting apparatus of the mammalia and certain elements of the lower jaw and branchial skeleton of fishes has occupied the attention of numerous authors. In fact the question may be considered as a classic, dating as it does to at least 1778, when Geoffry published his Dissertations sur l'organe de l'ouie de l'homme, des reptiles, et des poissons. From that time until 1898—from Geoffry to Gaupp—the contributions to the literature upon this subject constituted an enormous amount. Inasmuch as Gaupp has given a detailed and masterly review of the literature up to the time of his work (1898), and since Fuchs thoroughly covered the ground seven years later, I shall not undertake that task in the present communication. Moreover, as this paper is in the nature of a preliminary report upon the entire developmental history of the skull in the horse, I shall not here review in detail the contributions to the literature since the time of Fuchs' account (1905)

Type
Proceedings
Information
Proceedings of the Royal Society of Edinburgh , Volume 29 , 1909 , pp. 582 - 601
Copyright
Copyright © Royal Society of Edinburgh 1909

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References

page 583 note * It has again been recently asserted that the Eustachian tube is not the first visceral cleft but the second (Sudler, M. T., “The Development of the Nose and the Pharynx and its Derivation in Man,” Amer. Jour, of Anat., i. 1901–1902). However, as the designation of the Eustachian tube as first or second pharyngeal pouch does not affect its actual relations as a structure lying between and separating the Meckelian and Eeichertian cartilages, a detailed examination of that point is foreign to the present discussion.Google Scholar

page 588 note * I found in examining sections of rabbit of seventeen days (length 13·5 mm.) and a mole (length 10·5 mm.) which Dr Beard kindly allowed me to use, that this connection between stapes and incus was less marked in the mole than in the horse, and lacking entirely in the rabbit. However, both individuals (mole and rabbit) were further developed than the four-weeks horse.