. Biology of the Heteromyidae. Heteromyidae. 280 LAY. Fig. 7. —Enlargement of the third half turn of the cochlea of Z). merriami. LI = spiral limbus, Mod = modiolus, OL with white arrows = osseous spiral lamina, SL = spiral ligament, RM = Reisner's membrane, TM = tectorial membrane, SM = scala media (endolymph), ST = scala tympani (peri- lymph), SV = scala vestibuli (perilymph), black arrows = basilar membrane. osseous spiral lamina and the outer pillar cell and a zona pectinata that occupies the space between the outer pillar cell and the spiral ligament (Fig. 9). Comparative Anatomy of the C
. Biology of the Heteromyidae. Heteromyidae. 280 LAY. Fig. 7. —Enlargement of the third half turn of the cochlea of Z). merriami. LI = spiral limbus, Mod = modiolus, OL with white arrows = osseous spiral lamina, SL = spiral ligament, RM = Reisner's membrane, TM = tectorial membrane, SM = scala media (endolymph), ST = scala tympani (peri- lymph), SV = scala vestibuli (perilymph), black arrows = basilar membrane. osseous spiral lamina and the outer pillar cell and a zona pectinata that occupies the space between the outer pillar cell and the spiral ligament (Fig. 9). Comparative Anatomy of the Cochlea and the Organ of Corti Cochlea anatomy of all heteromyid gen- era but Heteromys has been described by Webster and Webster (1977). Pye (1965) presented some data on the inner ear o{Het- eromys. The following cochlear features display unusual variation among the Heteromyi- dae: structure of the basilar membrane; the supporting cells of the Organ of Corti; the scala typani. The zona pectinata of the basilar mem- brane encloses a large hyaline mass in Mi- crodipodops, Perognathus (Fig. 10), and Di- podomys (Fig. 7), and a much smaller quantity of hyaline material in Liomys (Webster and Webster, 1977) and Hetero- mys (Pye, 1965). The shape and quantity of this mass varies along the basilar membrane and is difficult to quantify (Fig. 11). Vari-. 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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