. The anatomical record. Anatomy; Anatomy. 86 The Anatomical Iiecorcl. (a) The operculum is developed out of the ear capsule with which it is connected at its caudal end. (h) The columella develops as an independent structure occupying a place cephalad of the operculum and becoming fused with the cephalic margin of the fenestra vestibuli. (c) A part of the crista parotica with which the processus superior columellse is connected develops from the quadrate, (d) A muscle extending from the supraclavicle has its cephalic inser- tion upon the operculum (m. opercularis). From the development in Amb
. The anatomical record. Anatomy; Anatomy. 86 The Anatomical Iiecorcl. (a) The operculum is developed out of the ear capsule with which it is connected at its caudal end. (h) The columella develops as an independent structure occupying a place cephalad of the operculum and becoming fused with the cephalic margin of the fenestra vestibuli. (c) A part of the crista parotica with which the processus superior columellse is connected develops from the quadrate, (d) A muscle extending from the supraclavicle has its cephalic inser- tion upon the operculum (m. opercularis). From the development in Ambystoma, as well as in the frog, it would appear that there are two distinct structures.—an operculum formed out of the ear capsule, at least in part, and a columella arising inde- pendently. This was the original view of Gaupp. We will have occasion to refer to it later in a discussion of the nomenclature of the parts here Fig. 3.—Ambystoma puuctatum transforming period: canalis anterior; cp., cavum perilymphaticum: utriculus; sacculus; squamosum; cl., canalis lateralis; Ic, ligamentum squamoso-columellare: vena jugu- laris; col., columella. That there are two distinct parts that have been variously spoken of as operculum and columella interchangeably is rendered very plausible Ijy a comparison of the relations in other Amphibia. In Ambystoma, Gyrinophilus and Diemictylus in the adult forms the perilymphatic prominence is well developer], containing, as has been said, an extension of the cavum perilymphaticum, the middle of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bardeen, Charles Russell, 1871-1935, ed; Boyden, Edward A. (Edward Allen), 1886-1976; Bremer, John Lewis, 1874- ed; Hardesty, Irving, b. 1866, ed; American Association of Anatomists; American Societ
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