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fasciculation
Spontaneous firing of an axon resulting in a visible twitch of all the muscle fibers it contacts; indicative of denervation.
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feline immunodeficiency virus (FIV)
A retrovirus that infects cats; similar to human immunodeficiency virus (HIV, the virus that causes AIDS), it attacks the immune system and as a result, the cat is more susceptible to infections that do not typically affect healthy cats.
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feline infectious peritonitis (FIP)
Highly contagious disease affecting cats caused by a coronavirus (so called because of the crown or halo appearance under a microscope). Peritonitis is inflammation of the peritoneum. The virus is shed through saliva and feces.
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feline nonsuppurative meningoencephalomyelitis
An inflammatory disease of the meninges, brain, and spinal cord (i.e. the central nervous system) in cats; also called staggering disease.
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fiber
fiber: long, threadlike structure. fibrous: any substance containing fibers. fibrosis: (1) the normal formation of fibrous tissue (2) the excessive growth of fibrous tissue in a repair or reactive process. fibrotic: pertaining to fibrosis.
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fibrillation
Spontaneous firing of a single muscle fiber not visable to the naked eye, indicative of denervation or irritable (i.e. inflammatory) myopathy; seen electrographically as a brief action potential with initial positive (down) wave followed by negative (up) wave.
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fibrocartilaginous embolism (FCE)
The sudden blocking of blood flow to the spinal cord due to the lodging of fibrocartilage (believed to have originated from an intervertebral disk) in a blood vessel; occasionally results in ischemia and infarction of the spinal cord.
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focal seizure
See partial seizure.
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fontanel
A soft spot; skin and membrane covered spaces remaining at the junction of the sutures, especially between the frontal and parietal bones, in the incompletely covered skull of the fetus or neonate. The fontanel usually closes after birth but in hydrocephalus, it may remain open.
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foramen magnum
Large opening at the base of the skull through which the spinal cord and vertebral arteries pass from the vertebral canal into the cranial cavity.
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fungus
A kingdom of multicellular lower plants lacking chlorophyll, e.g. mold, mildew, yeast, mushrooms. The fungus body normally consists of filamentous strands called mycelium and reproduces through dispersal of spores. ►click here to learn more-link provided by: www.merckvetmanual.com
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