Brain Facts and Figures. These data were obtained from several textbooks. All numbers are for humans unless otherwise indicated. Brain % brain of total body weight (150 pound human) = 2% Average brain width = 140 mm Average brain length = 167 mm Average brain height = 93 mm Intracranial contents by volume (1,700 ml, 100%): brain = 1,400 ml (80%); blood = 150 ml (10%); cerebrospinal fluid = 150 ml (10%) (from Rengachary, S.S. and Ellenbogen, R.G., editors, Principles of Neurosurgery, Edinburgh: Elsevier Mosby, 2005) Average number of neurons in the brain = 86 billion (Frederico Azevedo et al., Equal numbers of neuronal and nonneuronal cells make the human brain an isometrically scaled-up primate brain.
Ratio of glial cells to neurons in the brain = 1:1 Reference) (For more information about the number of neurons in the brain, see R.W. Number of neocortical neurons (females) = 19.3 billion (Pakkenberg, B. et al., Aging and the human neocortex, Exp. Total surface area of the cerebral cortex = 2,500 cm2 (2.5 ft2; A.
The Autonomic Nervous System - Sympathetic Division.
Neuroanatomy. Senses. The Cranial Nerves Song. Documentaries: The Alzheimer's Project: Watch the Films: The Supplementary Series: The Connection Between Insulin and Alzheimer's. Nova - Secrets Of The Mind. Neuroscience For Kids. The Hows, Whats and Whos of Neuroscience The Whats What is a neuron? A neuron is a nerve cell. The brain is made up of approximately 100 billion neurons. Neurons are similar to other cells in the body in some ways such as: Neurons are surrounded by a membrane.
However, neurons differ from other cells in the body in some ways such as: Neurons have specialized projections called dendrites and axons. There are approximately 1 quadrillion synapses in the human brain. Types of Neurons What is behind the saying "We use only 10% of our brain? " No...it is not true. The Hows How big is the brain? The adult human brain weighs between 1300 g and 1400 g (approximately 3 lbs). Elephant brain = 6,000 g chimpanzee brain = 420 g rhesus monkey brain = 95 g beagle dog brain = 72 g cat brain = 30 g rat brain = 2 g More Brain Weights How many neurons (nerve cells) are in the brain?
There are approximately 100 billion (100,000,000,000) neurons in the human brain. Here is another way to think of 100 billion: The Alzheimer's Project: Brain Development Cartoon. Pinky and the Brain BRAINS song.