80% of neurons in cerebellum vs 16 billion in cortex
Question asked:
“About 80% of neurons (~69 billion) are in the cerebellum, mostly tiny granule cells, while the cerebral cortex has ~16 billion neurons and everything else combined has under 1 billion neurons.”
Summary
Approximately 80 % of the brain’s ~86 billion neurons reside in the cerebellum, amounting to about 69 billion neurons, chiefly granule cells. The cerebral cortex contains roughly 16 billion neurons, and the remaining brain structures together account for about 1 billion or fewer neurons. These figures are consistent with current neuroscientific estimates.
Sources 60 searched
- Development and Evolution of Cerebral and Cerebellar Cortex - PMC
The human brain contains ~86 billion neurons, which are distributed nonuniformly across the cerebellum, cerebral cortex, and subcortical nuclei (Azevedo et al., 2009). The cerebellum contains ~80% of the brain’s neurons, but constitutes only ~10% of brain mass because most of its neurons ...
- A Comparative Perspective on the Cerebello-Cerebral System and Its Link to Cognition - PMC
The adult human cerebellum accounts for approximately 10% of the total brain volume [7–9]. Despite its modest size, the cerebellum contains approximately 80% of all neurons in the human brain [9]. Cerebellar granule cells (CGCs), the most numerous nerve cells in the brain, make up most of ...
- The Human Brain in Numbers: A Linearly Scaled-up Primate Brain - PMC
(2009), who found that the adult ... for a primate brain of 1.5 kg, while the human cerebellum, at 154 g and 69 billion neurons, matches or even slightly exceeds the expected (Table 2)....
- The cerebellum and its connections to other brain structures involved in motor and non-motor functions: A comprehensive review - ScienceDirect
The cerebellum is an important structure and a part of the central nervous system characterized by integrated feedback circuits with the cerebral cortex, brainstem, and spinal cord [1]. The cerebellum contains 80% of the neurons in the brain [2] ...
- Population-scale organization of cerebellar granule neuron signaling during a visuomotor behavior | Scientific Reports
Granule cells at the input layer of the cerebellum comprise over half the neurons in the human brain and are thought to be critical for learning. However, little is known about granule neuron signaling at the population scale during behavior.
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