Morphometric Analysis of Cochlear Structures in the Mustached Bat, Pteronotus Parnellii Parnellii
Mustached bats, Pteronotus parnellii, emit complex biosonar signals with a constant frequency (CF) component which is preceded and terminated by brief frequency modulated (FM) components. Each component is present in a series of at least four harmonics and the sense of hearing is very sharply tuned to the CF component frequencies of the second (ca 61kHz) and third (ca 91.5 kHz) harmonics (Pollak et al., 1979). The cochlea of P. parnellii is large and has a number of unusual anatomical and physiological properties (A. Pye, 1967; M. Henson, 1973; 1978; O. Henson et al., 1985; Kössl and Vater, 1985). The purpose of this paper is to report new observations on cochlear morphometry. These data will be related to the cochlear frequency map data of Kössl and Vater (1985) and Leake and Zook (1985), and to theories concerning cochlear micromechanics.
KeywordsBasilar Membrane Stria Vascularis Basal Turn Spiral Ligament Tectorial Membrane
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