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- noun Plural form of
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_fibrillae_, or little fibers; each of these fibrillae in turn being invested with a delicate sheath.
Among tissue cells degenerative changes may be abrupt, as in the sacrifice of the highly specialized fibrillae in muscle cells; or they may be very gradual, as in the transformation of cells of one sort into another that occurs in the regeneration of tentacles in Tubularia.
The figure shows the fibre ruptured, in order to display the sarcolemma; e.p. is the end plate of a nerve (n.v.), and fb. are the fibrillae into which a fibre may be teased.
The little mass was placed under the microscope; some of the fibrillae in the middle still exhibited transverse striae; others showed not a vestige of striae; and every gradation could be traced between these two states.
The numerous radical fibrillae replace, like so many pumps, the evaporated water; and so long as the soil is moist, or penetrated with water, the indispensable elements of the soil, dissolved in the water, are supplied to the plant.
The animal fpirits are an ex - ceeding fine fluid, which is fe - creted from the arterial blood by the brain and cerebellum, and palling into the medullary fub - trance and fpinal marrow, is fent, from thence into the fine tubes of the nervous fibrillae, then into the nerves in all the parts of the body.
Wissensch, 1880) and others, to increased tension on the fibrillae of the cornea, a double refraction being induced.