what is meant by white matter and gray matter ?
what is meant by white matter and gray matter？
Overview. The tissue called "gray matter" in the brain and spinal cord is also known as substantia grisea, and is made up of cell bodies. "White matter", or substantia alba, is composed of nerve fibers.2021年1月28日
Then,What is white matter?
White matter is found in the deeper tissues of the brain (subcortical). It contains nerve fibers (axons), which are extensions of nerve cells (neurons). Many of these nerve fibers are surrounded by a type of sheath or covering called myelin. Myelin gives the white matter its color.
Correspondingly,What is the difference between white matter and grey matter in the brain?
The central nervous system of the brain is made up of two kinds of tissue: grey matter and white matter. The grey matter contains the cell bodies, dendrites and the axon terminals, where all synapses are. The white matter is made up of axons, which connect different parts of grey matter to each other.
Long,What is a gray matter?
Gray matter, named for its pinkish-gray color, is home to neural cell bodies, axon terminals, and dendrites, as well as all nerve synapses. This brain tissue is abundant in the cerebellum, cerebrum, and brain stem. It also forms a butterfly-shaped portion of the central spinal cord.
Regarding this,What is grey matter?
Grey matter (or gray matter) makes up the outermost layer of the brain and is pinkish grey in tone, hence the name grey matter. It gets its grey tone from the high concentration of neuronal cell bodies in contains. Grey matter also contains unmyelinated axons.
Why is white matter so called?
White matter is named for its relatively light appearance resulting from the lipid content of myelin. However, the tissue of the freshly cut brain appears pinkish-white to the naked eye because myelin is composed largely of lipid tissue veined with capillaries.
What is the difference between white matter and gray matter quizlet?
The Gray Matter is a gray-colored zone that surrounds the hollow central cavity of the CNS. A mixture of neuron cell bodies of interneurons and motor neurons and neuroglia. Synapses occurs in gray matter. The White Matter contains no neuron cell bodies but millions of axons and neuroglia.
What is white matter in the spinal cord?
White matter is one of the two components of the central nervous system and consists mostly of glial cells and myelinated axons. The white matter is white because of the fatty substance ( myelin ) that surrounds the nerve fibers. Myelin acts as an electrical insulation.
What is the role of white matter?
Function. White matter essentially functions in affecting learning and brain functions, modulating the distribution of action potential, and coordinating communication between the different brain regions.
Where is grey matter found?
Related Stories. White matter is found buried in the inner layer of the brain's cortex, while the grey matter is mainly located on the surface of the brain. The spinal cord is arranged in the opposite way, with grey matter found deep inside its core and the insulating white matter wrapped around the outside.
What is white and grey matter in the spinal cord?
Gray matter contains neural cells, dendrites, and axon terminals, while white matter consists of axons and myelin, and plays a key role in nerve cells' ability to connect to one another. Injury to either variety of tissue can interfere with your central nervous system's ability to function.
What is grey matter in the spinal cord?
The grey matter, in the center of the cord, is shaped like a butterfly and consists of cell bodies of interneurons and motor neurons, as well as neuroglia cells and unmyelinated axons. Projections of the grey matter (the “wings”) are called horns.
What does white matter mean in the brain?
White matter is tissue in the brain composed of nerve fibers. The fibers (called axons) connect nerve cells and are covered by myelin (a type of fat). The myelin is what gives white matter its white color. Myelin speeds up the signals between the cells, enabling the brain cells to quickly send and receive messages.