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White matter forms the bulk of the deep parts of the brain and the superficial parts of the spinal cord. Aggregates of gray matter such as the basal ganglia (caudate nucleus, putamen,globus pallidus, subthalamic nucleus, nucleus accumbens) and brain stem nuclei (red nucleus, substantia nigra, cranial nerve nuclei) are spread within the cerebral white matter.
The cerebellum is structured in a similar manner as the cerebrum, with a superficial mantle of cerebellar cortex, deep cerebellar white matter (called the "arbor vitae") and aggregates of grey matter surrounded by deep cerebellar white matter (dentate nucleus, globose nucleus, emboliform nucleus, and fastigial nucleus). The fluid-filled cerebral ventricles (lateral ventricles,third ventricle, cerebral aqueduct, fourth ventricle) are also located deep within the cerebral white matter.
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What are the Ascending pathways of the central nervous system composed of?
The Ascending pathways of the central nervous system is made of "White Matter." (Vast amount of Axons coated with a sheath of Myelin)
What are the major divisions of the the central nervous system?
Central & Peripheral Edit: I don't think the last person read the entire question. Central (CNS) and Peripheral (PNS) are the two major divisions of the nervous system but the question is asking specifically about the central. Two major division of the central nervous system (structurally) are White matter and Gray matter.
What system does White matter refer to myelinated fibers?
White matter refers to the parts of the central nervous system that are primarily composed of myelinated nerve fibers. These fibers are responsible for transmitting information between different areas of the brain and spinal cord. White matter appears white because of the high lipid content of the myelin sheaths.
White matter is composed of axons that are sheathed in what?
White matter is composed of axons that are sheathed in fatty myelin, which helps to insulate and protect the axons. The myelin sheath is produced by specialized cells called oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system.
What are clusters of gray and white matter containing cell bodies called in the central nervous system?
Clusters of gray matter containing cell bodies in the central nervous system are called nuclei. They primarily consist of nerve cell bodies and are involved in processing and integrating information. White matter, on the other hand, consists mainly of myelinated axons and serves to transmit information between different regions of the nervous system.
What are the two major divisions of the central nervous system?
Central & Peripheral Edit: I don't think the last person read the entire question. Central (CNS) and Peripheral (PNS) are the two major divisions of the nervous system but the question is asking specifically about the central. Two major division of the central nervous system (structurally) are White matter and Gray matter.
What is the function of white mater in the spinal cord?
White and grey matter are essentially made up of bundles of nerve fibers (called neurons) that convey nerve impulses between the peripheral nervous system and the central nervous system. The major difference between white and gray matter within the spinal cord is that white matter is primarily composed of myelinated nerve fibers, while the nerve fibers of gray matter are not. Myelinated nerve cells tremendously increase the speed at which the action potential (nerve impulse) moves along the neurons axon. The job of the neurons that make up white matter is to either convey an action potential from a sensory receptor to the central nervous system, or, from the central nervous system out to an effector (such as a muscle or tissue). These neurons are called sensory neurons and motor neurons respectively. Gray matter consists of unmyelinated neurons, called interneurons. Their main duty is to provide communication between the peripheral and central nervous systems. Think of interneurons as a bridge linking two regions together. For unmyelinated neurons, the speed at which an action potential can propagate down the cell's axon is far less than that of the myelinated neurons of white matter.
Where in the CNS and PNS is white matter found?
White matter is found in both the central nervous system (CNS) and the peripheral nervous system (PNS). In the CNS, white matter is located deep in the brain and on the outer part of the spinal cord, consisting of myelinated axons that facilitate communication between different parts of the brain. In the PNS, white matter is present in the nerves outside of the brain and spinal cord, serving to transmit signals between the CNS and the rest of the body.
What is the gray-white matter junction in the brain?
Gray matter contains most of the neuronal cell bodies in the brain, and involves muscle control and the senses. White matter transfers the messages between different areas of the central nervous system.
What makes up white matter?
White matter is mainly composed of nerve fibers called axons, which are covered by a fatty substance called myelin. These axons form connections between different parts of the brain and spinal cord, allowing for communication between neurons. White matter is responsible for transmitting signals and coordinating communication within the nervous system.
Large bundles of axons and dendrites visible to the unaided eye are?
Tracts of axons in the central nervous system (CNS) are visible to the unaided eye and are called white matter. In the peripheral nervous system (PNS), nerve bundles are visible and may appear as "cables" connecting different parts of the body.
A group of myelinated fiber may form a region of nerve tissue called?
A group of myelinated fibers may form a region of nerve tissue called a white matter tract. White matter in the central nervous system consists of myelinated nerve fibers that transmit information between different parts of the brain and spinal cord.
