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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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608Maggenti and Gardnerneurite see axonneurobiotaxis n. [Gr. neuron, nerve; bios, life; taxis, arrangement]1. The hypothetical migration <strong>of</strong> nerve cellsand ganglia toward regions <strong>of</strong> maximum stimulation duringphylogeny. 2. In embryology, tendency <strong>of</strong> nerve cells tomigrate toward the source <strong>of</strong> their stimuli.neuroblast n. [Gr. neuron, nerve; blastos, bud] (ARTHRO: Insecta)In embryology, the inner layer <strong>of</strong> ectodermal cellsthat forms the nervous tissue. see dermatoblasts.neurocirrus n.; pl. -ri [Gr. neuron, nerve; L. cirrus, curl](ANN: Polychaeta) Cirrus normally on the lower edge <strong>of</strong> theneuropodium.neurocyte n. [Gr. neuron, nerve; kytos, container] The cellbody <strong>of</strong> a neuron; the nerve cell; cyton.neur<strong>of</strong>ibrils n.pl. [Gr. neuron, nerve; L. dim. fibre, thread]Fine fibers running longitudinally in axons and dendritesand through the body <strong>of</strong> the neuron.neurogenic a. [Gr. neuron, nerve; gennaein, to produce] 1.Forming nervous tissue. 2. Stimulating nervous energy forcertain muscular or glandular reactions. see myogenic.neuroglia n.pl. [Gr. neuron, nerve; glia, glue] Nonnerve cellsin the brain or ganglia; glia; glial cells; gliacytes.neurohemal organs (ARTHRO: Insecta) Organs involved withthe release <strong>of</strong> products <strong>of</strong> neurosecretory cells into thehemolymph; corpora cardiaca best developed though lessconspicuous ones make up the perisympathetic system associatedwith the ventral nerve cord.neurohormone n. [Gr. neuron, nerve; hormaein, to excite] Ahormone produced by neurosecretory cells.neurohumor see neurotransmitterneuroid transmission Arousal activity by cells other thannerve cells.neurolemma see Schwann cellneuromere n. [Gr. neuron, nerve; meros, part] (ARTHRO: Insecta)Any <strong>of</strong> the transitory segmental elevations in thewall <strong>of</strong> a developing embryo.

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