A COMPARISON OF THE EIMERS ORGANS OF 3 NORTH-AMERICAN MOLES - THE HAIRY-TAILED MOLE (PARASCALOPS-BREWERI), THE STAR-NOSED MOLE (CONDYLURA-CRISTATA), AND THE EASTERN MOLE (SCALOPUS-AQUATICUS)

被引:29
作者
CATANIA, KC [1 ]
机构
[1] UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,NEUROBIOL UNIT,LA JOLLA,CA 92093
关键词
EPIDERMIS; MERKEL CELL; MECHANORECEPTOR; TALPIDAE; INSECTIVORE;
D O I
10.1002/cne.903540110
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Eimer's organ is a tactile sensory structure found predominantly on the snouts of moles. It consists of a raised papilla of epidermis containing a column of cells associated with sensory receptors. This study compares the Eimer's organs of the hairy-tailed mole, Parascalops breweri, the star-nosed mole, Condylura cristata, and the eastern mole, Scalopus aquaticus, by using scanning electron microscopy and light microscopy. Eimer's organs are visible on the snout of the hairy-tailed and the star-nosed moles, but not the eastern mole. The Eimer's organs of the hairy-tailed mole are similar in external appearance, distribution, and internal structure to those found in most species examined. The Eimer's organs of the star-nosed mole and the eastern mole diverge from this basic form in seemingly opposite directions. The Eimer's organs of the star-nosed mole are more numerous, smaller, and highly organized units with a consistent pattern of neuronal terminal swellings within a cell column, below a thin keratinized epidermis. By contrast, the Eimer's organs of the eastern mole lie below a thick keratinized epidermis, are less organized in structure, and have no central cell column, The extreme differences between the Eimer's organs of the star-nosed mole and those of the eastern mole may be the result of the habitat of each species, saturated mud allowing a more elaborate and delicate sensory apparatus in the star-nosed mole and drier soil requiring a thick keratinized epidermis over the organ in the eastern mole. (C) 1995 Wiley-Liss, Inc.
引用
收藏
页码:150 / 160
页数:11
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