Connectome by Sebastian Seung
Author:Sebastian Seung
Language: eng
Format: mobi, epub
Publisher: Houghton Mifflin Harcourt
Published: 2013-02-17T07:43:21+00:00
Figure 48. Gray versus white matter of the cerebrum
The distinction between gray and white matter was known in antiquity, but their fundamental difference became clear only after the discovery of neurons. The outer gray matter is a mixture of all parts of neurons—cell bodies, dendrites, axons, and synapses—while the white matter contains only axons. In other words, the inner white matter is all “wires.”
Most white-matter axons come from neurons in the surrounding cerebral cortex. They belong to pyramidal neurons, which constitute about 80 percent of all cortical neurons. Earlier I mentioned that this neuron type has a cell body with a triangular or pyramidal shape, and an axon that travels a long distance from the cell body. Let’s refine the picture here. The apex of the pyramid points toward the exterior of the brain. The axon comes straight out of the base of the pyramid, perpendicular to the cortical sheet, and plunges into the white matter, as Figure 49 shows.
Download
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.
Periodization Training for Sports by Tudor Bompa(7914)
Why We Sleep: Unlocking the Power of Sleep and Dreams by Matthew Walker(6350)
Paper Towns by Green John(4786)
The Immortal Life of Henrietta Lacks by Rebecca Skloot(4248)
The Sports Rules Book by Human Kinetics(4072)
Dynamic Alignment Through Imagery by Eric Franklin(3914)
ACSM's Complete Guide to Fitness & Health by ACSM(3819)
Kaplan MCAT Organic Chemistry Review: Created for MCAT 2015 (Kaplan Test Prep) by Kaplan(3796)
Introduction to Kinesiology by Shirl J. Hoffman(3621)
Livewired by David Eagleman(3531)
The River of Consciousness by Oliver Sacks(3414)
The Death of the Heart by Elizabeth Bowen(3333)
Alchemy and Alchemists by C. J. S. Thompson(3292)
Descartes' Error by Antonio Damasio(3162)
Bad Pharma by Ben Goldacre(3091)
The Gene: An Intimate History by Siddhartha Mukherjee(2926)
The Emperor of All Maladies: A Biography of Cancer by Siddhartha Mukherjee(2924)
The Fate of Rome: Climate, Disease, and the End of an Empire (The Princeton History of the Ancient World) by Kyle Harper(2865)
Kaplan MCAT Behavioral Sciences Review: Created for MCAT 2015 (Kaplan Test Prep) by Kaplan(2814)
