File:Anatomy of the cat (1991) (18195441731).jpg

Title: Anatomy of the cat
Identifier: anatomyofcatrje00reig (find matches)
Year: 1991 (1990s)
Authors: Reighard, Jacob Ellsworth, 1861-1942; Jennings, H. S. (Herbert Spencer), 1868-1947
Subjects: Cats; Mammals
Publisher: (Austin, TX) : BookLab, Inc.
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library

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THE EAR. 417 ear in the fact that the edges of the auricular cartilages are rolled together proximad so as to overlap. There is thus no gap between the tragus (g) and antitragus (h), as in man, but these two structures partly overlap. The free edge (b) of the auricular cartilage corresponds partly to the helix of man. At its mediocranial angle the proximal part of the auricle is composed of muscle and integument only, so that the cartilage when isolated presents here a deep notch distad of which is a prominent projecting angle, the Spine (c) of the helix, which serves for attachment of the adductor auris superior muscle (Fig. 169, 1). Proxi- mad of the spine, separated from it by the deep notch, the cranial edge (g) of the auricular cartilage ap- proaches the caudal edge (/i), finally overlapping it, so that the cavity of the auricle is now completely sur- rounded. This overlapping portion of the cartilage is on the medial side of the cavity, and in the natural state is covered by muscles and integu- ment, so as not to be apparent. That portion of the cranial edge of the cartilage that overlaps the cau- dal edge forms a cartilaginous plate which projects proximad as a blunt ^ concha; /cartilaginous audi- . tory meatus;/, crista helicis; g, pomt; this plate is the tragus (g). tragus; //.antitragus; /.processus Along the inner edge of the tragus is ""^inatus;/, eminentia conchse. a ridge which forms a continuation of the helix; this is the crista helicis (/). The portion of the caudal edge of the car- tilage that is partly overlapped by the tragus is an irregular flat plate known as the antitragus (h). At its caudolateral margin the antitragus extends distad as a thin, pointed, cartilaginous spine, the processus uncinatus (/). This supports a sheet of
Text Appearing After Image:
Fig. 168. —Cartilage of the External Ear, Craniome- DiAL View. a, scapha or pinna; /', helix, c, spine of tlie helix; d, antihelix;

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