what is the difference between white and grey matter in the brain and spinal cord?
16377
White matter is the whitish nerve tissue of the central nervous system that is mainly composed of myelinated nerve fibers (or axons). The central nervous system is the brain and spinal cord. And gray matter is grayish nerve tissue of the central nervous system mainly composed of nerve cell bodies and dendrites.
902361
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. Dendrites or nerve endings.
717156
There are three main types of white matter nerve fiber tracts: commissural fibers, association fibers, and projection fibers. ... Association fibers connect brain regions within the same hemisphere. Projection fibers connect the cerebral cortex to the brainstem and spinal cord.
124493
What is the difference between gray matter and white matter. Gray matter does not contain mylein sheath over the axon. White matter has a myelin sheath covering. Nodes of Ranvier are small gaps between the myelin sheath.
239599
The spinal cord consists of nerves that carry incoming and outgoing messages between the brain and the rest of the body. It is also the center for reflexes, such as the knee jerk reflex (see Figure: Reflex Arc: A No-Brainer). Like the brain, the spinal cord is covered by three layers of tissue (meninges).
1149937
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.
719553
The vertebral column is made up of bones. It is part of the human skeleton. The spinal cord, on the other hand, is part of the central nervous system....
326467
['1.1 White and gray matter.', '1.2 Spinal cord. 1.2.1 Cranial nerves.', '1.3 Brain. 1.3.1 Brainstem. 1.3.2 Cerebellum. 1.3.3 Diencephalon. 1.3.4 Cerebrum.', '1.4 Difference from the peripheral nervous system.']
1159550
The hair is actually clear, not grey or white. This is due to the lack of melanin and pigmentation in the hair follicles. ... Grey hair happens when there is still black or natural colored hair left. White hair is when all color is gone leaving only white hair.
29275
Glia, also called glial cells or neuroglia, are non-neuronal cells in the central nervous system (brain and spinal cord) and the peripheral nervous system that do not produce electrical impulses. They maintain homeostasis, form myelin, and provide support and protection for neurons.
1300839
Basic Structures The CNS consists of the brain and spinal cord, while the PNS includes all other nervous system tissue. All sensory receptors, sensory neurons and motor neurons are part of the PNS. ... In the CNS, a group of neurons is called a nucleus.
292273
Cerebral- and spinal white matter do not contain dendrites, neural cell bodies, or shorter axons, which can only be found in grey matter.
474811
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.
1212108
Oligodendrocytes form the myelin sheath around axons. Astrocytes provide nutrients to neurons, maintain their extracellular environment, and provide structural support. Microglia scavenge pathogens and dead cells. Ependymal cells produce cerebrospinal fluid that cushions the neurons.
1175331
Spinal Cord Tracts The ascending tracts generally carry sensory information from the periphery to the brain, while the descending tracts carry motor signals to muscles and glands.
238894
Quick Reference. Functional groups of neurones occurring in the grey matter of the brain and spinal cord, which process and integrate incoming information received from other sources, such as the sense organs, and transmit the processed information to other destinations.
319223
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.