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Anatomical and microscopic study of the volar dermal ridges of the rat ( Rattus norvegicus )
Author(s) -
Okajima M.,
Asai Y.
Publication year - 1985
Publication title -
american journal of physical anthropology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.146
H-Index - 119
eISSN - 1096-8644
pISSN - 0002-9483
DOI - 10.1002/ajpa.1330670202
Subject(s) - anatomy , dermal papillae , eccrine sweat , dermis , epidermis (zoology) , apex (geometry) , groove (engineering) , biology , art , sweat , materials science , paleontology , hair follicle , microbiology and biotechnology , metallurgy
The epidermal ridges of the rat ( Rattus norvegicus ), which are distributed only on the volar pads and digital apices, were studied. Examination of the ridges was difficult on the epidermal surface, as the undulations expressed on the epidermis are weak. Therefore, the dermal surface, prepared by alkaline solution treatment, was inspected by scanning electron microscopy and staining with toluidine blue. The dermis of the pads and digital apices is composed of ridged and rippled areas. The ridged area, where sweat ducts are distributed, is constructed of grooves and ramparts. Frequently, the sweat duct is surrounded by a dermal collar, and the groove is separated by a dermal partition. The grooves and ramparts display dermatoglyphic configurations, such as whorls, loops, cusps, triradii, and some other patterns, which are peculiar to each pad and digital apex and comparable to dermatoglyphic patterns, of man and other primates.