On the modifications of the first and second visceral arches : with especial reference to the homologies of the auditory ossicles / by Hans Gadow.
- Gadow, Hans Friedrich, 1855-1928.
- Date:
- 1888
Licence: Public Domain Mark
Credit: On the modifications of the first and second visceral arches : with especial reference to the homologies of the auditory ossicles / by Hans Gadow. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![annulus tympanicus. The mandible has lost its articulation with the quadrate, and the masticatory joint is a single concave-convex one, the convexity belonging to the mandible (Monodelphia). Modifications of the Visceral Arches. 1st arch. Palato- Ilnd arch. a. Hyomandibula. b. Hyoid Illrd arch (2nd branchial) IVth arch (2nd branchial) Y. VI. VII. Pre VIII. Present on Copula between II. and III. forms the .... Copula between III. and 1Y. forms the Amphibia. Reptilia. Aves. Mammalia. quadrato - mandibu] ar arch. . Forms the cartila Principal, hyoid arch ginous or osseous Small, anterior horn apparatus of the Os entoglossum middle ear. [minus Anterior horn, s. cornu = cerato + 1 epi + > hyal stylo -J Remains in the adult Frog as the cornu thyr- oideum Big, second horn One only well - developed horn, wrongly called “ hyoid” Thyrohyal s. cornu posterius s, cornu majus sent in Tadpoles, p ly in Heptanchus. Often big, e.g., in Chelonia artly permanent in Disap Perennibranchiata peared ^Basihyal, s. cor pus lingua. Basihyal, s. corpus linguae. Urohyal Explanation of Plates. The following abbreviations have been used throughout the figures. Als. Alisphenoid. asc.p. Ascending process of quadrate. A.ty. Annulus tympanicus, or tympanic bone. Art. Os articulare mandibulse. Br.I. First branchial (= 3rd visceral) arch. Cd. Condyle of occiput. Cd.m. Condyle of mandible of Mammalia. Col. Columella auris. C.br. Ceratobranchial (of 3rd visceral arch). ep. Epiotic bone or cartilage. Ex.o. Exoccipital bone. e.co. Extracolumella = extrastapedial + infra + suprastapedial of Huxley and Parker. e.st. Extrastapedial process of Huxley and Parker = manubrium of malleus.](https://iiif.wellcomecollection.org/image/b2228946x_0036.jp2/full/800%2C/0/default.jpg)
