Phantom pain is pain that feels like it's coming from a body part that's no longer there. Cytoplasmic processes join the nerve cells (neurons) of nerve nets. It is comprised of two hemispheres, each controlling the opposite side of the body. Neurons are similar to other cells in the human body in a number of ways, but there is one key difference between neurons and other cells. In cnidarians the neurons are joined to epithelial receptors and to contractile cells. nervous system synonyms, nervous system pronunciation, nervous system translation, English dictionary definition of nervous system. Get the word of the day delivered to your inbox, © 1998-, AlleyDog.com. Help us get better. Neural transmission occurs when a neuron is activated, or fired (sends out an electrical impulse). Habituation is a form of non-associative learning in which an innate (non-reinforced) response to a stimulus decreases after repeated or prolonged presentations of that stimulus. In vertebrate animals, neurons are the core components of the brain, spinal cord and peripheral nerves. The outer ear includes the pinna, which is the visible part of the ear that protrudes from our heads, the auditory canal, and the tympanic membrane, or eardrum.The middle ear contains three tiny bones known as the ossicles, which are named the malleus (or hammer), incus (or anvil), and the stapes (or stirrup). home / medterms medical dictionary a-z list / olfactory nerve definition Medical Definition of Olfactory nerve. Supercell clusters. Repolarization definition is - restoration of the difference in charge between the inside and outside of the cell membrane following depolarization. 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. In The process of converting physical energy into activity in the nervous system is known in sensory psychology as transduction. Neuroplasticity, also known as neural plasticity, or brain plasticity, is the ability of neural networks in the brain to change through growth and reorganization. nerve cells in the brain that respond to specific features of the stimulus, such as shape, angle, or movement Parallel processing the processing of several aspects of a problem simultaneously; the brain's natural mode of information processing for many functions, including vision. Help us get better. Activation (firing) of the neuron takes place when the neuron is stimulated by pressure, heat, light, or … Medical Author: William C. Shiel Jr., MD, FACP, FACR; Optic nerve: The optic nerve connects the eye to the brain. NERVE: "There are millions of individual nerves in the human body which support the, Cite this page: N., Pam M.S., "NERVE," in, How to Reduce Swelling (Edema) Quickly after Pregnancy, Intelligence Across the African-American and Latino Cultures, Counseling Children and Adolescents on Death. Peripheral neuropathy, a result of damage to the nerves outside of the brain and spinal cord (peripheral nerves), often causes weakness, numbness and pain, usually in your hands and feet. 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. Term Neurons communicate with each other as well as with other cells through electric signals (nerve impulses), which in turn allows effector organs to respond to the appropriate stimuli. Nerve, in anatomy, a glistening white cordlike bundle of fibres, surrounded by a sheath, that connects the nervous system with other parts of the body. Auditory nerve definition, either one of the eighth pair of cranial nerves, consisting of sensory fibers that conduct impulses from the organs of hearing and from the semicircular canals to the brain. The olfactory nerve is the first cranial nerve. Nerve net, primitive nerve arrangement forming the entire nervous system of many cnidarians and a part of more advanced nervous systems. AP Psychology Unit 4: Sensation and Perception Extra Definitions. 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. In humans 12 pairs are attached to the brain and 31 pairs to the spinal cord. Definition: What are Nerve Cells? Medical Definition of Optic nerve. They are numbered according to where their nucleilie in the brain stem, e.g. n. The system of cells, tissues, and organs that regulates the body's responses to internal and external stimuli. Neurons are specialized to transmit information throughout the body. All material within this site is the property of AlleyDog.com. Neurons are typically composed of a soma, or cell body, a dendritic tree and an axon. The function of a neuron is to transmit information within the nervous system. 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