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Giovanni Mattaliano

: an electrical signal that travels along a nerve fiber in response to a stimulus and serves to transmit a record of sensation from a receptor or an instruction to act to an effector : the propagation of an action potential along the length of a neuron. Help us get better. These include medications such as Elavil®, Tofranil®, nortriptyline or … Privacy Policy - Terms of Service. In The motor fibers are mainly involved with the muscles utilized in … They are numbered according to where their nucleilie in the brain stem, e.g. Blind spot, small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. Medical Definition of Neuroplasticity. The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. The longest axons in the human body, for example, are those of the sciatic nerve, which run from the base of the spine to the big toe of each foot. along with the brain form the central nervous system (CNS) and transmits information to and from the body and brain. In gross anatomy, the nervous system can be divided into distinct organs, these being stations through which the neural pathways cross. Consequently, the fibers are covered with myelin produced by oligodendrocytes rather than the Schwann cells of the peripheral nervous system. [ nûrv ] Any of the bundles of fibers made up of neurons that carry sensory and motor information throughout the body in the form of electrical impulses. acetylcholine. Supercell clusters. This lesson defines and explains what nerves are as well as associated terminology: neurons, receptors, impulse, stimulus, ascending and descending nerve tracts, ganglion, and plexus. These impulses are dispatched through the optic nerve to … Published by Houghton Mifflin Harcourt Publishing Company. Information comes into one end of the cell (the Dendrites) and then goes out the other end (the Axon) so that it can be passed on to another cell. Depolarization is the reversal of charges in a nerve cell that causes it to fire (the positive region becomes negatively charged and vice versa). Psychology definition for Nerve Deafness in normal everyday language, edited by psychologists, professors and leading students. His nerves were on edge as he entered the dark room. When you feel something, it is because of the electrical signals sent by nerves firing up to your brain and back. Learn more here. Cranial Nerve III (the Oculomotor nerve) leaves the brainstem at a higher position than Cranial nerve XII, whose origin is located more caudally (lower) than the other cranial nerves. From Longman Dictionary of Contemporary English. The human nervous system can be described both by gross anatomy, (which describes the parts that are large enough to be seen with the naked eye,) and by microanatomy, (which describes the system at a cellular level.) Neurotransmitters are chemical messengers in the nervous system. Nerve net, primitive nerve arrangement forming the entire nervous system of many cnidarians and a part of more advanced nervous systems. Medical Definition of nerve impulse. Neurotransmitters are chemical messengers in the nervous system. Her nerves were stretched almost to breaking point as she waited. Neuroplasticity allows the neurons (nerve cells) in the brain to compensate for injury and disease and to adjust their activities in response to new situations or to changes in their environment. Cranial Nerve III (the Oculomotor nerve) leaves the brainstem at a higher position than Cranial nerve XII, whose origin is located more caudally (lower) than the other cranial nerves. One of its two branches carries the sensation of sound to the brain; the other is involved in maintaining balance. Vagus means wandering, and the vagus nerve begins at the base of the brain, branches down to the heart, the lungs, and the digestive tract, with stops … Afferent nerves carry information to the central nervous system, and efferent nerves carry information from the central nervous system to the muscles, organs, and glands. Parasympathetic nervous system definition is - the part of the autonomic nervous system that contains chiefly cholinergic fibers, that tends to induce secretion, to increase the tone and contractility of smooth muscle, and to slow heart rate, and that consists of a cranial and a sacral part. This is defined as partial or total hearing loss due to damage in the inner ear. Psychology definition for Optic Nerve in normal everyday language, edited by psychologists, professors and leading students. In cnidarians the neurons are joined to epithelial receptors and to contractile cells. He suffered from nerves and could no longer perform on stage. In cnidarians the neurons are joined to epithelial receptors and to contractile cells. 2021 board of directors; 2020 board of directors; 2019 board of directors; 2018 board of directors; 2017 board of directors; mgc calendar; tournaments Psychology Definition of OLFACTORY NERVE: the first cranial nerve, that carries sensory fibers regarding the sense of scent. There are no photoreceptors (i.e., rods and cones) in the optic disk, and, therefore, there is no image detection in this area. Medical Author: William C. Shiel Jr., MD, FACP, FACR; Neuroplasticity: The brain's ability to reorganize itself by forming new neural connections throughout life. These single-cell fibers of the sciatic nervemay extend a meter or eve… See more. The ""gate"" is opened by the activity of pain signals traveling up small nerve fibers and is closed by activity in larger fibers or by information coming from the brain. I wanted to ask him the question, but I lost my nerve. Commonly referred to Sign in The nerve that connects the inner ear with the brain. It also contains neural circuits that independently control numerous reflexes and central pattern generators. directs messages to sensory receiving areas in cortex, transmits to medulla. Privacy Policy - Terms of Service. Purpose: To determine interocular differences in the retinal nerve fiber layer (RNFL) and optic nerve head (ONH) parameters in a pediatric population using Cirrus high-definition optical coherence tomography (HD-OCT). Clusters of cells that respond to more complex patterns of visual information. The optic nerve carries the impulses formed by the retina, the nerve layer that lines the back of the eye and senses light and creates impulses. 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