These nerve fibers. These single-cell fibers of the sciatic nervemay extend a meter or eve… It also contains neural circuits that independently control numerous reflexes and central pattern generators. Most commonly, the damage is to the hair cells in the cochlea (the snail-shaped part of the inner ear). Methods: Seventy normal Indian children aged 5-17 years presenting to the Pediatric Clinic were included in this observational cross-sectional study. One of its two branches carries the sensation of sound to the brain; the other is involved in maintaining balance. Damaged hair cells cannot transmit electrical impulses to the auditory nerve … Spinal nerve definition, any of a series of paired nerves that originate in the nerve roots of the spinal cord and emerge from the vertebrae on both sides of the spinal column, each branching out to innervate a specific region of the neck, trunk, or limbs. Nerves are the smallest cells in the body and are responsible for carrying information around your body - the information they carry is in the form of electrical impulses. Her nerves were stretched almost to breaking point as she waited. somebody's nerves are tattered/frayed/shattered. 2021 board of directors; 2020 board of directors; 2019 board of directors; 2018 board of directors; 2017 board of directors; mgc calendar; tournaments Cytoplasmic processes join the nerve cells (neurons) of nerve nets. Medical Definition of nerve impulse. Auditory Nerve. directs messages to sensory receiving areas in cortex, transmits to medulla. Nerve net, primitive nerve arrangement forming the entire nervous system of many cnidarians and a part of more advanced nervous systems. Nerves are the smallest cells in the body and are responsible for carrying information around your body - the information they carry is in the form of electrical impulses. 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. 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.) The Spinal Cord is a long, tubular bundle of nerve fibers that extends from the brain through the spinal column. She took a few deep breaths, trying to calm her nerves. 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. They accused the government of a loss of nerve. ... a branch of psychology concerned with the links between psychology and behavior. Neurons, also known as nerve cells, send and receive signals from your brain. This process happens over and over to carry the information all around the body. Help us get better. Repolarization definition is - restoration of the difference in charge between the inside and outside of the cell membrane following depolarization. In cnidarians the neurons are joined to epithelial receptors and to contractile cells. They influence mood, muscle movement, heart rate, and many other functions. Note: A nerve impulse occurs when a stimulus exceeds a certain threshold resulting in … Show all entries from Topic: Psychology, psychiatry. The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Medical definition of femoral nerve: the largest branch of the lumbar plexus that in humans comes from the second, third, and fourth lumbar nerves and supplies extensor muscles of the thigh and skin areas on the front of the thigh and medial surface of the leg and foot and that sends articular branches to the hip and knee joints —called also anterior crural nerve. 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. Suddenly she was wide awake, her nerves jangling. Psychology Definition of NERVE: is a term used to describe a collection of fibres which are found outside the central nervous system, typically sheathed in an insulating material, such Psychology Definition of OPTIC NERVE: the second cranial nerve, that transports the axons of retinal ganglion cells and continues from the retina on to the optic chiasm. Published by Houghton Mifflin Harcourt Publishing Company. Neurotransmitters are chemical messengers in the nervous system. Consequently, the fibers are covered with myelin produced by oligodendrocytes rather than the Schwann cells of the peripheral nervous system. ... Summary: A newly engineered compound prevents damage to myelin and nerve fibers by stimulating a protective response in cells that produce and maintain myelin. 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. 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. Supercell clusters. In They are numbered according to where their nucleilie in the brain stem, e.g. It starts within the olfactory lobe and is dispersed to the nasal Harrison had an attack of nerves before the match. nerve in Psychology, psychiatry topic. home / medterms medical dictionary a-z list / olfactory nerve definition Medical Definition of Olfactory nerve. Note: A nerve impulse occurs when a stimulus exceeds a certain threshold resulting in the movement of positively charged … I was a bag of nerves during the interview. In Serial processing. Consequently, the fibers are covered with myelin produced by oligodendrocytes rather than the Schwann cells of the peripheral nervous system. The next few days would test their nerve to the limit. They are numbered according to where their nucleilie in the brain stem, e.g. I wanted to ask him the question, but I lost my nerve. Help us get better. His nerves were on edge as he entered the dark room. Terms in this set (50) ... make up the optical nerve. These impulses are dispatched through the optic nerve to … Psychology Definition of OPTIC NERVE: the second cranial nerve, that transports the axons of retinal ganglion cells and continues from the retina … 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. Learn more here. The olfactory nerve is the first cranial nerve. These impulses are dispatched through the optic nerve to the brain, which interprets them as images. Clusters of cells that respond to more complex patterns of visual information. directs messages to sensory receiving areas in cortex, transmits to medulla. Psychology Definition of SCIATIC NERVE: A substantial nerve begins in the lower portion of the spine and passes through the pelvis on … Just before the audition he was shaking with nerves. It also contains neural circuits that independently control numerous reflexes and central pattern generators. She was in such a state of nerves that she jumped at every noise. All material within this site is the property of AlleyDog.com. The motor fibers are mainly involved with the muscles utilized in … See more. The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. [ 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. Similarly, the optic nerve is ensheathed in all three meningeal layers (dura, arachnoid, and pia mater) rather th… Depolarization is the reversal of charges in a nerve cell that causes it to fire (the positive region becomes negatively charged and vice versa). This is defined as partial or total hearing loss due to damage in the inner ear. 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 … Nerve impulse definition, a progressive wave of electric and chemical activity along a nerve fiber that stimulates or inhibits the action of a muscle, gland, or other nerve cell. 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. Nerve net, primitive nerve arrangement forming the entire nervous system of many cnidarians and a part of more advanced nervous systems. The nerves conduct impulses toward or away from the central nervous mechanism. Individual axons are microscopic in diameter - typically about one micrometre across (1μm) - but may extend to macroscopic (>1mm) lengths. Quite a few of the students suffered from exam nerves. Neurotransmitters are chemical messengers in the nervous system. In humans 12 pairs are attached to the brain and 31 pairs to the spinal cord. Medical Author: William C. Shiel Jr., MD, FACP, FACR; Olfactory nerve: The nerve that carries impulses for the sense of smell from the nose to the brain. 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. Privacy Policy - Terms of Service. This process happens over and over to carry the information all around the body. Medical Author: William C. Shiel Jr., MD, FACP, FACR; Neuroplasticity: The brain's ability to reorganize itself by forming new neural connections throughout life. 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 of OLFACTORY NERVE: the first cranial nerve, that carries sensory fibers regarding the sense of scent. The Auditory Nerve, also known as the Cochlear or acoustic nerve (part of the vestibulocochlear or 8th cranial nerve), is a sensory nerve, it is found in the head and transmits information from the inner ear (cochlea) to the brain in the form of sound (acoustic) energy that impinges on the ear drum (tympanic membrane). 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. Similarly, the optic nerve is ensheathed in all three meningeal layers (dura, arachnoid, and pia mater) rather than the epineurium, perineurium, and endoneurium foun… Medical Definition of Neuroplasticity. From Longman Dictionary of Contemporary English. 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. He suffered from nerves and could no longer perform on stage. 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 … N'T have the nerve to the limit 12 pairs of cranial nerves are traditionally abbreviated by the of. 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