. Biology of the Heteromyidae. Heteromyidae. ANATOMY OF THE HETEROMYID EAR Douglas M. Lay Introduction Middle and inner ear anatomy exhibit striking differences in detail and scale among the heteromyid genera. The relative hypertrophy of middle ear structures is greatest in Dipodomys and Microdipodops, least in Liomys and Heteromys, and inter- mediate in Perognathus and Chaetodipus. Patterns of anatomical variation in the cochlea parallel those of the middle ear. Howell (1932) provided the first anatom- ical descriptions of the middle ear of Di- podomys. A series of papers by Webster and cowor
. Biology of the Heteromyidae. Heteromyidae. ANATOMY OF THE HETEROMYID EAR Douglas M. Lay Introduction Middle and inner ear anatomy exhibit striking differences in detail and scale among the heteromyid genera. The relative hypertrophy of middle ear structures is greatest in Dipodomys and Microdipodops, least in Liomys and Heteromys, and inter- mediate in Perognathus and Chaetodipus. Patterns of anatomical variation in the cochlea parallel those of the middle ear. Howell (1932) provided the first anatom- ical descriptions of the middle ear of Di- podomys. A series of papers by Webster and coworkers (Webster, 1961, 1962; Webster and Webster, 1971, 1975, 1977) have pro- duced a significant body of data describing middle and inner ear anatomy and physi- ology of most heteromyid genera and have elucidated the probable functional signifi- cance of the highly specialized ears of Di- podomys and Microdipodops. This work is summarized in a review by Webster and Webster (1984). Many facets of Webster's work are utilized in the present review and the reader should consult the original papers for details omitted here (see also Hafner, this volume).. .â M^Ks^- â Anatomy of the Heteromyid Middle Ear The middle ear, located within the tem- poral bone, is formed by components which function in combination to transmit the en- ergy of airborne sound waves to transducers in the fluid-filled inner ear. The middle ear, thus, consists of air-filled cavities and a con- ducting system, the tympanum (ear drum), malleus, incus and stapes, which receive and transmit airborne sound energy across the middle ear to the inner ear. The middle ear functions to transform acoustical energy in air to acoustical energy in the cochlear fluids. Since acoustic im- pedance in air is much lower than in fluid, the middle ear functions to match these im- pedances with minimum loss. Webster and Webster (1975) and Durrant and Lovrinic 270. Please note that these images are extracted from scanned page images t
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