A nerve that conducts from the periphery toward a nerve center; the axon of a sensory neuron.
The fine branching terminal fibers of axons or collaterals.
The ganglionic nerve mass of the prostomium in Annelida.
A neuron lying within the central nervous system that intermediates between sensory and motor neurons or between other association neurons.
The principal process or nerve fiber of a neuron; neurite.
The cephalic nerve mass situated above the foregut, including the primitively postoral second antennal ganglia in insects.
central nervous system
The part of the nervous system containing the motor neurocytes and the synaptic junctions between communicating neurons.
The crossing of nerve tracts within a nerve center.
The connectives between the brain and the ventral nerve cord embracing the anterior foregut. Primitively the connectives from the archicerebrum to the first ventral ganglia; in insects, the connectives between the tritocerebral ganglia and the mandibular ganglia.
A lateral branch of an axon.
A transverse tract of nerve fibers connecting the two ganglia of a segment or the lateral centers within a median ganglion.
The property of nervous or other protoplasmic tissue by which changes in metabolic activity are propagated through it.
A longitudinal cord of nerve fibers connecting successive ganglia.
The occipital ganglion of Snodgrass. A single or
paired postcerebral ganglion of the stomatogastric nervous system (Pharyngeal, esophageal, or hypocerebral, ganglion).
Finely ramifying branches given off from a nerve cell.
The part of the arthropod brain containing the first antennal nerve centers.
The peripheral branch or one of several distal branches of a sensory nerve cell.
One of the organs of the body activated by nerve stimuli, principally a muscle or a gland.
A nerve that conducts from a nerve center toward the periphery; the axon of a motor neuron.
The median precerebral ganglion of the stomatogastric system.
Frontal Ganglion Connectives
The connectives between the tritocerebral ganglia
and the frontal ganglion.
A central nerve mass; the term applied to a single primitive ganglion, or to a body formed of two or more united primitive ganglia.
The cellular supporting tissue of the nervous system.
Specialized association cells of the brain, usually distinguished by their small size, poverty of cytoplasm, and richly chromatic nuclei.
A small compact mass of intermingled terminal arborizations of nerve fibers within a nerve center.
A paired ganglion of the stomatogastric nervous system in some insects, situated on the side of the crop (Gastric ganglion).
Unpaired nerves arising from the ganglia of the ventral nerve cord between the roots of the connectives.
The dense fibrous mass of nerve terminals forming the interior of a ganglion. (Neuropile, punctate substance)
A neuron of which the axon terminates in an effector.
Any one of the fibrous tracts of the peripheral nervous system, whether a single fiber or a group of fibers; a nerve trunk.
The axon or other branches of a neurocyte.
A strand of nerve fibers; usually applied to tracts within a nerve center.
A bundle of nerve fibers in the peripheral system; the usual nerves.
The nucleated sheath of nerve tissue, covering the ganglia, nerve trunks, and terminal branches.
The cell body of a neuron, usually called the "nerve cell."
An entire nerve cell, including the neurocyte and axon and all their branches.
The medullary substance, or mass of fibrous tissue within a ganglion.
peripheral nervous system
The outlying parts of the nervous system in distinction to the
central ganglia and connectives, including the sensory neurocytes and their axons, and the axons of the motor neurons.
The first part of the arthropod brain, containing the ocular and other association centers lying anterior or dorsal to the antennal (deutocerebral) centers.
A so-called sense organ, or specialized structure of the integument responsive to external stimuli.
The median stomatogastric nerve extending posteriorly from the frontal ganglion.
The neurocyte of a sensory neuron. A sense cell of Type I has an unbranched distal process going to a specific sense organ; a sense cell of Type II has one or more branched processes with a diffuse distribution.
The labile property of protoplasm that makes it responsive to stimuli, highly developed in nerve tissue.
Any change in the environment or in the internal conditions of the animal that produces activity in labile tissues.
stomodaeal nervous system
The nervous system centering in the ganglia of the foregut.
(Stomatogastric, visceral, or sympathetic, nervous system.)
The commissure of the tritocerebral ganglia, which
goes below the foregut.
The composite ventral nerve mass of the head in
insects, formed of the united primitive ganglia of the gnathal somites.
The central mechanism of intercommunication between terminal fibers of two or more neurons.
The third part of the insect brain, formed of the ganglia of the
postoral second antennal somite.
ventral nerve cord
The chain of connected ventral ganglia, morphologically
beginning with the tritocerebral ganglia of the brain; in entomology the term usually applied to the thoracic and abdominal ganglia only.