afference n. [L. ad, near; ferre, to bear] Impulses from the external sense organs of an animal because of events in the environment. see reafference.
afferent a. [L. afferre, to bring] Refers to a structure or vessel that leads to or toward a given position. see efferent.
afferent channel (ARTHRO: Crustacea) The opening through which water passes to the gills.
afferent fiber A nerve fiber carrying impulses from a receptor to the central nervous system.
afferent nerve A nerve that conducts impulses from the periphery toward a nerve center; the axon of a sensory neuron between a receptor and the central nervous system.
afferent neuron (neurone) A sensory neuron that conveys inward impulses received or perceived by a sense organ from external sources.
affinity n.; pl. -ties [L. affinis, related to] Relationship; sometimes misleadingly employed as synonym for phenetic similarity.
aflagellar a. [Gr. a, without; L. flagellum, whip] Without flagella.
afterbody a. [A.S. aefter, behind; bodig, body] (ARTHRO: In-secta) In Coleoptera, the body area behind the pronotum.
after-discharge 1. The continuing discharge of impulses after stimulation has ceased in sensory receptors. 2. The continuation of the motor response (reflexes) after discontinuance of stimulation. see after-sensation.
afternose a. [A.S. aefter, behind; nosu, nose] (ARTHRO: In-secta) Pertaining to the triangular area below the antennae and above the clypeus.
after-sensation Continuation of nerve impulses after cessation of external stimulation of sensory apparatus.
agameon n. [Gr. a, without; gamos, marriage; on, being] A species reproducing exclusively by apomixis. see apomic-tic (ameiotic) parthenogenesis.
agamete n. [Gr. a, without; gamos, marriage] Any product of reproductive multiple fission that develops directly into the adult form without sexual union.
agamic a. [Gr. a, without; gamos, marriage] Parthenogenetic; reproduction without mating, may be either mitotic or mei-otic.
agamobium n. [Gr. a, without; gamos, marriage; bios, life] The asexual form in alternation of generations. see gamo-bium.
agamodeme n. [Gr. a, without; gamos, marriage; demos, people] A population mainly consisting of asexual organisms.
agamogenesis n. [Gr. a, without; gamos, marriage; genesis, beginning] Asexual reproduction; parthenogenesis; reproduction without fertilization by a male gamete. agamoge-netic a. see gamogenesis.
agamospecies n. [Gr. a, without; gamos, marriage; L. spe cies, kind] A species without sexual reproduction; an asexual species.
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