[Study of hair discs (II)].
D000375:Aging; D000818:Animals; D006197:Hair / Q000648:ultrastructure*; D008855:Microscopy, Electron, Scanning; D051381:Rats; D011919:Rats, Inbred Strains; D011984:Sensory Receptor Cells / Q000648:ultrastructure*; D012867:Skin / Q000294:innervation*