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Related Experiment Videos

Cellular scaling rules for rodent brains.

Suzana Herculano-Houzel1, Bruno Mota, Roberto Lent

  • 1Departamento de Anatomia, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, 21941-590, Rio de Janeiro, Brazil. suzanahh@ism.com.br

Proceedings of the National Academy of Sciences of the United States of America
|August 2, 2006
PubMed
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Brain size in rodents increases with more and larger neurons and non-neuronal cells. Glial cell numbers expand to maintain a constant mass ratio, driving cerebral cortex expansion.

Area of Science:

  • Neuroscience
  • Comparative Biology
  • Evolutionary Biology

Background:

  • Brain size varies significantly across species.
  • Cellular composition (neuron number, size, and non-neuronal cells) is a key factor influencing brain size.
  • Understanding these cellular mechanisms is crucial for explaining evolutionary patterns in brain morphology.

Purpose of the Study:

  • To investigate how cell number and size contribute to the variation in brain size across rodent species.
  • To determine the relationship between neuronal and non-neuronal cell populations in brain structure scaling.
  • To elucidate the cellular basis for the differential expansion of the cerebral cortex and cerebellum.

Main Methods:

  • Comparative analysis of brain structures (cerebral cortex, cerebellum) across six rodent species.

Related Experiment Videos

  • Quantification of neuron and non-neuronal cell numbers and sizes.
  • Calculation of cell mass ratios and regional fractions within the brain.

    • Main Results:

    • Increased brain size in rodents is associated with both a greater number of neurons and larger neuronal size.
    • Non-neuronal cell numbers increase substantially with brain size, maintaining a constant total mass ratio with neurons.
    • The cerebellum shows a faster increase in neuron number relative to brain size compared to the cortex, yet the cortical fraction of neurons remains constant.
    • Relative cortical size increases with total brain size, while the cortical fraction of total brain neurons stays constant.

    Conclusions:

    • The expansion of the cerebral cortex is driven by increases in neuronal size and number, alongside a proportional increase in non-neuronal cells.
    • A fixed glia/neuron total mass ratio acts as a cellular constraint, influencing the relative expansion of brain regions.
    • Differential scaling of neuronal size between the cortex and cerebellum, coupled with glial proliferation, underlies the relative enlargement of the cerebral cortex in rodents.