Abstract
The recent applications of the stereology in the neurocience has permitted to accomplishunbiased estimates of numerous morphologic parameters of the Nervous System. This work
intends to analyze the precision of the stereological estimations in two psicobiological studies:
numerical and volumetric quantifications of nervous cells applying two stereological
techniques: the optical fractionator and the Cavalieri's principle. The precision of these
estimates depends on two sources on variation: the biological variation (intrinsic to the object
of study) and the stereological (caused by the employed techniques). In the text is discussed
how to optimize the efficiency of the estimates attending to these two sources of variation.
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