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Grey matter is where cell bodies of neurons reside in the brain and spinal cord, and white matter is the myelinated axons that connect it.
Distinguish between grey and white matter of the central nervous system
Grey matter consist of neuronal cell bodies, neuropil, glial cells, and capillaries. It is distributed at the surface of the cerebral hemispheres and of the cerebellum, as well as in the depths of the cerebrum, cerebellar, brainstem, and spinal cord.
White matter is composed of bundles of myelinated axons that connect various grey matter regions of the nervous system to each other.
Myelin is a lipid that forms a thin layer, known as the myelin sheath, around the axons of white matter neurons It acts as an electrical insulator, increasing the speed of transmission of nerve signals by allowing the signal to jump down the axon.
Grey matter (or gray matter) is a major component of the central nervous system, consisting of neuronal cell bodies, neuropil (dendrites and unmyelinated axons), glial cells (astroglia and oligodendrocytes), and capillaries . Grey matter is distributed at the surface of the cerebral hemisphere's cerebellum, as well as in the depths of the cerebrum, cerebellar, brainstem, and spinal grey matter. In living tissue, grey matter actually has a grey-brown color, which comes from capillary blood vessels and neuronal cell bodies. Grey matter includes regions of the brain involved in muscle control, sensory perception, such as seeing and hearing; memory, emotions, and speech.
Grey and White Matter
Micrograph showing grey matter, with the characteristic neuronal cell bodies (right of image - darker pink), and white matter with its characteristic fine mesh work-like appearance (left of image - lighter pink).
A second major component of the central nervous system is white matter and it is composed of bundles of myelinated axons that connect various grey matter regions of the nervous system to each other and carry nerve impulses between neurons . White matter only contains the axons of the nerve cells, and not the cell bodies, which are found in grey matter. Myelin is a lipid that forms a thin layer, known as the myelin sheath, around the axons of white matter neurons It acts as an electrical insulator, increasing the transmission speed of nerve signals by allowing the signal to jump down the axon. Myelin also gives white matter its characteristic color. At the age of 20, the total length of myelinated fibers in the body, if places end to end, is 176,000 km (109.4 miles) in males and is 149,000 km (92.6 miles) in females.
White Matter on an MRI
This MRI highlights the location of white matter in the brain.
Using a computer network as an analogy, the gray matter can be thought of as the actual computers themselves, whereas the white matter represents the network cables connecting the computers together.
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Grey matter consists of cell bodies, neuropil, glia, and capillaries, White matter consists only of bundles of myelinated (insulated) axons, White matter connects various brain grey matter regions to each other, and All of the statements about grey and white matter are true
Source: Boundless. “Grey and White Matter.” Boundless Anatomy and Physiology. Boundless, 01 Jul. 2015. Retrieved 01 Jul. 2015 from https://www.boundless.com/physiology/textbooks/boundless-anatomy-and-physiology-textbook/nervous-tissue-11/collections-of-nervous-tissue-112/grey-and-white-matter-610-1755/