. Biology of the Heteromyidae. Heteromyidae. HETEROMYID EAR 281. Fig. 8.—a nearly mid modiolar section of the cochlea of D. merriami. B = base, A = apex, ME = hypotympanum of middle ear, BR = brain, M = modiolus, SA = stapedial artery, VIII = acoustic division of cranial nerve VIII, 1 through 7 = cochlear half turns from base to apex. ation in the distribution of the hyaline mass along the basilar membrane has been treat- ed by measuring its thickness at the point of greatest extension below the basilar membrane. While not entirely satisfactory this method does convey an idea of changes in bas
. Biology of the Heteromyidae. Heteromyidae. HETEROMYID EAR 281. Fig. 8.—a nearly mid modiolar section of the cochlea of D. merriami. B = base, A = apex, ME = hypotympanum of middle ear, BR = brain, M = modiolus, SA = stapedial artery, VIII = acoustic division of cranial nerve VIII, 1 through 7 = cochlear half turns from base to apex. ation in the distribution of the hyaline mass along the basilar membrane has been treat- ed by measuring its thickness at the point of greatest extension below the basilar membrane. While not entirely satisfactory this method does convey an idea of changes in basilar membrane thickness. Data on all genera but Hetewmys reveal a similar pat- tern in the distribution of hyaline material within the zona pectinata (Webster and Webster, 1977). The thickness of the pars pectinata is least in the basal turn of all genera, increases rapidly through the first turn to reach a maximum in the second turn, and decreases beyond this point until at the apex it is about the same thickness as in the basal turn. Relative thickness is greatest in Microdipodops and least in Liomys; Dipod-. 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 Brown, James H; Genoways, Hugh H. [Stillwater, Okla. ?] : American Society of Mammalogists
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