what is the difference between gray matter and white matter in the spinal cord?
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Grey matter is distinguished from white matter in that it contains numerous cell bodies and relatively few myelinated axons, while white matter contains relatively few cell bodies and is composed chiefly of long-range myelinated axons. ... The colour difference arises mainly from the whiteness of myelin.
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The anterior/ventral root contains efferent nerve fibres, which carry stimuli away from the CNS towards their target structures. The cell bodies of the ventral roots are located in the central grey matter of the spinal cord.
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The dorsal root is the afferent sensory root and carries sensory information to the brain. The ventral root is the efferent motor root and carries motor information from the brain. The spinal nerve emerges from the spinal column through an opening (intervertebral foramen) between adjacent vertebrae.
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Fibrous astrocytes are found throughout all white matter and exhibit a morphology of many long fiber-like processes [191]. ... a Protoplasmic astrocyte giving rise to a dense network of finely branching processes throughout its local gray matter neuropil, as well as to a large stem branch ...
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Namely, the gray matter contains glial cells, axon tracts, neuropil (glia, dendrites, and unmyelinated axons), as well as capillary blood vessels (1). The white matter contains the glial cells responsible for the production of myelin (the oligodendrocytes) and the astrocytes (1).
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Myelinated neurons are typically found in the peripheral nerves (sensory and motor neurons), while non-myelinated neurons are found in the brain and spinal cord.
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Brain imaging studies have shown that women have a higher percentage of gray matter, the computational tissue of the brain, while men have a higher percentage of white matter, the connective cables of the brain. But few studies have shown that men's and women's brains are connected differently.
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Dendrites are limited to a small region around the cell body while axons can be much longer. Structure. Substantial structural differences exist between dendrites and axons. ... Dendrites usually receive signals, while axons typically transmit them.
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The central nervous system (CNS) is the brain and spinal cord, and the peripheral nervous system (PNS) is everything else (Figure 1). The brain is contained within the cranial cavity of the skull, and the spinal cord is contained within the vertebral cavity of the vertebral column.
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Fluid attenuated Importantly, at first glance FLAIR images appear similar to T1 (CSF is dark). The best way to tell the two apart is to look at the grey-white matter. T1 sequences will have grey matter being darker than white matter.
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The main difference between these two types of neurons is the speed of conduction of impulse. ... Majority of the neurons in the central and peripheral nervous system are myelinated since they require fast conduction speeds. A neuron with unmyelinated axon has a comparatively lower speed of conduction of the nerve signals.
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MS produces damage in the more heavily myelinated regions of the brain, known as white matter. But MS has also been shown to affect the less myelinated regions closer to the surface of the brain, known as cortical grey matter. Damage to both white matter and grey matter structures are linked to cognitive impairment.
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The Ventral Root of the spinal nerve contains outgoing, efferent (meaning to "bear away from") fibers that carry information destined to control motor or glandular function. The cell bodies of these motor neurons are located in the ventral horns of the spinal cord's central grey region.
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Function. Grey matter contains most of the brain's neuronal cell bodies. The grey matter includes regions of the brain involved in muscle control, and sensory perception such as seeing and hearing, memory, emotions, speech, decision making, and self-control.
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One type of glia, the oligodendrocytes, produce the myelin sheaths that insulate the axons of many central nervous system neurons.
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Ventral roots consist of axons from motor neurons, which bring information to the periphery from cell bodies within the CNS. Dorsal roots and ventral roots come together and exit the intervertebral foramina as they become spinal nerves.
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They produce a fatty substance called myelin, which is wrapped around axons as a layer of insulation. Similar in function to insulation layers around power cables, the myelin sheath allows electrical messages to travel faster, and gives white matter its name—the white is the myelin wrapped around axons.