- extrafusal fibers
- ordinary muscle fibers, as opposed to the intrafusal fibers of the muscle spindle.
Medical dictionary. 2011.
extrafusal fibers
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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 — ex·tra·fu·sal fyü zəl adj situated outside a striated muscle spindle <extrafusal muscle fibers> compare INTRAFUSAL * * * ex·tra·fu·sal (eks″trə fuґzəl) [extra + fusus] pertaining to striated muscle fibers outside the muscle… … Medical dictionary
General somatic efferent fibers — Scheme showing structure of a typical spinal nerve. 1. Somatic efferent. 2. Somatic afferent. 3,4,5. Sympathetic efferent. 6,7. Sympathetic afferent. Gray s … Wikipedia
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
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
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
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
Motor neuron — Neuron: Motor neuron Micrograph of the hypoglossal nucleus showing motor neurons with their c … Wikipedia
Skeletal striated muscle — A top down view of skeletal muscle Latin textus muscularis striatus skeletalis Code TH … Wikipedia
