This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...of a suspensor of the lower jaw which acquires a new articulation farther forward. This difficulty of explaining this new articulation is the strongest objection to the incudo-quadrate homology but, as will appear shortly, the same difficulty must be met by all unless, like Albrecht, they are ready to ...
Read More
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...of a suspensor of the lower jaw which acquires a new articulation farther forward. This difficulty of explaining this new articulation is the strongest objection to the incudo-quadrate homology but, as will appear shortly, the same difficulty must be met by all unless, like Albrecht, they are ready to homologise cartilage bones with membrane bones and to ignore all facts of development. Leaving for the present this matter of the new articulation of the lower jaw there remain a number of objections to the homologies here adopted. The argument of Dollo ("83) may serve as the type of several of these. He claims that if we can find a sauropsidan in which all six bones of the lower jaw are present; in which the columella is broken up into elements, one of which has the shape and relations of a malleus, while a true quadrate is also present, such a form will show that the quadrate cannot be one of the ossicles of the mammalian ear for that is already accounted for. Such conditions Dollo finds in several lizards. A reply has already been given in this article to this line of reasoning but it may be repeated here. The part which he regards as having the relations of a malleus is the tympanic portion of the extracolumella and this is homologous with a part (manubrium) and not to the whole of the malleus, but this homology and the other one of identity of stapes in the two groups cannot introduce the incus, which is pretrematic and in front of the chorda tympani, into the columellar tract, all parts of which are post trematic and lie behind the chorda tympani. The same facts are also opposed to the conclusions of Frazer ('82), who maintains that the incus is formed from the proximal end of the hyoid "as is shown by the continuity of embryonic...
Read Less
Add this copy of The Ossicula Auditus to cart. $37.36, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2012 by Nabu Press.
