FUNCTIONAL COCHLEAR MORPHOLOGY OF THE TWO-TOED SLOTH (CHOLOEPUS SP.)

Authors
  1. Ramprashad, F.
  2. Landolt, J.P.
  3. Money, K.E.
  4. Correia, M.J.
  5. Laufer, J.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
A morphometric study of the cochlea was made from serial sections and graphic reconstructions of the cochlea of two-toed sloths. The cochlea had 2-1/4 spirals and measured approximately 17.4 mm in length. Cochlear morphometric parameters studied were the changes in cross-sectional area of the scalae vestibuli, media, and tympani, thickness of the pars tecta and the pectinata of the basilar membrane, width of the basilar membrane, and density of the bipolar ganglion cells. The change in the cross-sectional area of the scala vestibuli differed from the scala tympani; the former decreased from the oval window and increased to a second maximum value at 12.2 mm from the basal end, while the latter increased from the round window membrane to a maximum value at 4.8 mm and remained unchanged throughout the remainder of the cochlear length. TRUNCATED
Report Number
DCIEM-79-P-30 — Research Paper
Date of publication
01 Jan 1979
Number of Pages
13
Reprinted from
The Evolution & Ecology of Armadillos, Sloths, & Verminilinguas, Smithsonian Inst. Washington DC, 1985, p 199-211
DSTKIM No
86-01958
CANDIS No
96680
Format(s):
Hardcopy;Originator's fiche received by DSIS

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