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Abstract Cerebellar afferents from the inferior olivary nuclei arise from about one million nerve cells. This figure was determined by counts and estimates carried out on four complete series of human brain‐stem sections of a new‐born, a three‐month‐old infant, a 42‐year‐old male and a 56‐year‐old male. Cell frequencies in all four cases were nearly identical. About 7% of this total belongs to the two accessory nuclei, believed to project to the archeocerebellar cortex. Cell sizes differ between the main and the two accessory olivary nuclei, the former having a mean cell size of about 400 μ 2 , the latter about half this size. Comparing infant and adult cell size, there is a threefold increase in volume from infancy to adulthood. Packing density of nerve cells in the infants is about twice that of the adults. The ratio of nerve cells to glia cells is 1:4 in the adults and 1:6.7 in the infants.
Farhad Moatamed (Thu,) studied this question.