[Enter your text here]
The adult human brain weighs between 1300 g and 1400 g (approximately 3 lbs).
A newborn human brain weighs between 350 and 400 g, while an elephant brain weighs 6,000 g; a chimpanzee brain, 420 g; and a cat brain, 30 g.
Source:  AANN
It is estimated that there are 100 billion (100,000,000,000) neurons in the human brain.

Source:  AANN
The average spinal cord is 45 cm long in men and 
43 cm long in women, with an average weight of
approximately 35 g.

Source: AANN

Information travels at different speeds within different types of neurons. Transmission can be as slow as 0.5 meters/sec or as fast as 120 meters/sec. Traveling at 120 meters/sec is the same as going 268 miles/hr!

source:  AANN

 
  Total volume of cerebrospinal fluid in the average
  human body = 125-150 ml

  Source:
  http://faculty.washington.edu/chudler/facts.html


  Turnover of entire volume of cerebrospinal fluid =
  3 to 4 times per day

  Source: 
  http://faculty.washington.edu/chudler/facts.html
  (from Kandel et al., 2000, p. 1296)


  Rate of production of CSF = 0.35 ml/min
  (500 ml/day)

  Source:
  http://faculty.washington.edu/chudler/facts.html
  (from Kandel et al., 2000, p. 1296)


  pH of cerebrospinal fluid = 7.33

  Source: 
  http://faculty.washington.edu/chudler/facts.html
  (from Kandel et al., 2000, p. 1296)


  Specific gravity of cerebrospinal fluid = 1.007

  Source:
  http://faculty.washington.edu/chudler/facts.html


Samuel Adams at Faneuil Hall  Photo by H. Doucette