PURKINJE-CELL COMPLEMENTS IN MAMMALIAN CEREBELLA AND THE BIASES INCURRED BY COUNTING NUCLEOLI

An unbiased stereological counting device (the fractionator) was used to count Purkinje neurons in mammalian cerebella of known weights in o rder to define the relationship between weight and number. Nucleoli we re chosen as the counting unit and numbers were estimated from uniform random samples of wax-embedded tissue sections. For the cerebella of rat, rabbit, cat, dog, goat, sheep, pig, ox, horse and human, there wa s a significant linear relationship between log number and log weight. The allometric relationship took the form N = 748 500 x W0.627. The r elative bias associated with using nucleoli as counting units was asse ssed separately on disector pairs of sections and amounted to roughly - 5 % but varied between species. When the brains of females and males were analysed separately (cat, goat, pig, ox, horse, human), there we re no significant differences between the regression lines. These resu lts are consistent with earlier findings. They imply that Purkinje neu ron packing densities decrease as brain size increases. Moreover, our preliminary findings appear to indicate that, for any given cerebellar weight, females and males have similar numbers of neurons.