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ex·tra·fu·sal (eks″trə-fuґzəl) [extra- + fusus] pertaining to striated muscle fibers outside the muscle spindle.Medical dictionary. 2011.
Extrafusal muscle fiber — Extrafusal muscle fibers are a class of muscle fiber innervated by alpha motor neurons. They generate tension, do mechanical work and allow for movement by contracting.Compare with intrafusal muscle fiber is of sensory type and innervated by… … Wikipedia
extrafusal fibers — ordinary muscle fibers, as opposed to the intrafusal fibers of the muscle spindle … Medical dictionary
Muscle spindle — Latin fusus neuromuscularis Code TH H3.11.06.0.00018 Muscle spindles are sensory receptors within the belly of a muscle, which primarily detect changes in the length of this muscle. They convey length information to the central nervous system via … Wikipedia
Alpha motor neuron — Infobox Anatomy Name = Alpha motor neuron Latin = GraySubject = 190 GrayPage = Caption = Alpha motor neurons are derived from the basal plate (basal lamina) of the developing embryo. Width = 200 Caption2 = System = Central nervous system… … Wikipedia
mechanoreception — See mechanoreceptor. * * * Ability to detect and respond to mechanical stimuli in one s environment. A slight deformation of a mechanoreceptive neuron causes an electric charge at its surface, activating a response. Mechanoreceptors in pain spots … Universalium
nervous system, human — ▪ anatomy Introduction system that conducts stimuli from sensory receptors to the brain and spinal cord and that conducts impulses back to other parts of the body. As with other higher vertebrates, the human nervous system has two main… … Universalium
Motor neuron — Neuron: Motor neuron Micrograph of the hypoglossal nucleus showing motor neurons with their c … Wikipedia
Nuclear chain fiber — A muscle spindle, with γ motor and Ia sensory fibers Latin myofibra catenaformis Code TH … Wikipedia
Intrafusal muscle fiber — Intrafusal fibers are muscle fibers that comprise the muscle spindle and are innervated by the gamma motor neurons (gamma motoneuron). These fibers are walled off from the rest of the muscle by a collagen sheath. This sheath has a spindle or… … Wikipedia
Nerve fiber — Latin neurofibra MeSH Nerve+Fibers Code TA A14.0.00.001 A nerve fiber is a threadlike extension of a nerve cell and consists of an axon … Wikipedia
