Vl
N
P
TABLE
2.2. Continued
(::l
Membrane Auditory
Density
Vestibular VestibularOptic
Optic~
~
Common
Cochlear
length
ganglion
(cells/mm
ganglion
auditory
nerve
auditory vestibular
;::l
Species
name
type
(mm)
cells
cochlea)
cells
ratio
fibers
ratio
ratio
Balaenoptera
Fin whale
M
64.7
134,098
2,073
-
-
252,000
1.88
physalus
Megaptera
Humpback
M
60.1
156,374
2,602
-
-
347,000
2.22
novaeangliae
whale
Cavia porcella
Guinea pig
T
18.5
24,011
1,298
8,231
0.34
Felis domesticus
Cat
T
25.8
50,896
1,972
12,376
0.24
193,000
3.73
15.59
Homo sapiens
Human
T
33.5
30,500
910
15,590
0.51
1,159,000
38.00
74.34
Pteronotus
Mustached bat
}E
14.3
12,800
895/1,900 11
parnellii
Rhinolophus
Horseshoe bat
}E
16.1
15,953
99111,750 11
ferrumequinum
1
Average values used when more than one source available for a species.
ttDensity near auditory fovea sensu Bruns and Schmiezek (1980).
I
=aquatic; peak spectra >100 kHz; II
=aquatic; peak spectra <90kHz; M
=aquatic; peak spectra < 2kHz;}E
=reolian >20 kHz; Sb
=fossorial; T
=terrestrial; A =
amphibious.
Data compiled from Gacek and Rasmussen 1961; Jansen and Jansen 1969; Firbas 1972; Morgane and Jacobs 1972; Bruns and Schmieszek 1980; Dawson
1980; Ketten 1984,1992; Vater 1998a,
b; Nado11988; Gao and Zhou 1991, 1992, 1995; Kossl and Vater 1995.