WordNet

any receptor that responds to stimuli outside the body

English Journal

[Systems of chemoperception in decapod crayfish].

Fedotov VP.AbstractThe review presents data on some peripheral and central structures in the system of perception of chemical stimuli in crayfish and other Decapoda. The hair receptors on chelipeds, antennas, antennules are innervated by mechano-and chemoreceptor neurons. Antennules are the specialized crayfish chemoreceptor organs, on the surface of which groups of exteroceptors are located. There is an ordered disposition of exteroceptor receptive fields in the form of receptor hair bushes on claws of ambulatory feet (AF), antennas, antennules, and other movable appendages. Behavioral experiments have shown sensitivity of crayfish to odor of individuals of their gender, sex partners as well as the presence in crayfish of pheromones providing connection of female with offspring at the initial stages of the life cycle. Occasional chemosensory cells innervating hair bushes on the crayfish AF respond to amino acids, amines, nucleotides, and sugars. Minimal thresholds of reaction of the studied Decapoda chemoreceptors in response to some chemical compounds correspond to concentrations of 0.1-1 microM. For some chemoreceptors, dose-dependent effects have been shown. Alongside with monomodal chemoreceptors, the crayfish have bimodal receptor perceiving mechanical and chemical stimuli. The efficient response of crayfish chemoreceptors can be obtained to the substance that includes amino group with the hydrogen bridge with carboxyl group, contains no more than 3 carbon atoms in the chain, and is characterized by a certain stereoform. Among chemoreceptors there are fast and slow adapting cells. Efficiency of response of individual chemoreceptors depends on temperature of medium. Chemoreceptors reacting to ecdysterons have been revealed in crayfish. Ecdysterons play a great role in intra- and interspecies communications in Crustacea. Based on the study of efferent responses of interneurons of the first and higher orders in the first thoracic crayfish ganglion to stimulation of the own receptive fields, a concept is put forward of the structural-functional organization of afferent projections at the segmental level. Peculiarities of afferent projections from antennule chemoreceptors are considered. The data are presented on connections of these chemoreceptors with antennular, olfactory, and additional lobules, various cell groups, interneurons of the first, second, and third orders located in various brain parts. An attention is drawn to connections of serotonin neurons in glomeruli with endings of chemoreceptor neurons and projection of interneurons of the higher orders,. which are located in the internal medulla of the crayfish eye stalks. Several principles of integration of the chemoreceptor information in central parts of the crayfish nervous system are discussed. The giant serotonin neurons revealed in crayfish glomeruli most likely participate in formation of memory to certain chemical actions. Polymodal receptor signals in the central chain of the perception system activate autonomic centers, and the changes of the animal functional state can be evaluated from the heart responses. The crayfish heart responses recorded by novel noninvasive methods allow detection of the initial and other phases of the stress state at changes of the chemical quality of medium. Progress of the current biochemical and electrophysiological methods of study of chemoreceptors allow hoping for learning of fine chemoperception mechanisms in invertebrate and vertebrate animals.
Zhurnal evoliutsionnoĭ biokhimii i fiziologii.Zh Evol Biokhim Fiziol.2009 Jan-Feb;45(1):3-24.
The review presents data on some peripheral and central structures in the system of perception of chemical stimuli in crayfish and other Decapoda. The hair receptors on chelipeds, antennas, antennules are innervated by mechano-and chemoreceptor neurons. Antennules are the specialized crayfish chemor
PMID 19370985

Primary sensory neurons in the central nervous system.

Sotnikov OS.SourceLaboratory of Neuronal Functional Morphology and Physiology, IP Pavlov Institute of Physiology, Russian Academy of Sciences, St. Petersburg.
Neuroscience and behavioral physiology.Neurosci Behav Physiol.2006 Jun;36(5):541-8.
Published data and our own results relating to exteroceptor and a variety of interceptor neurons in the brain and spinal cord, such as intraspinal Hesse ocelli and light-sensitive epiphyseal and ependymal neurons, are presented. Light-sensitive ganglion neurons in invertebrates are also described, a
PMID 16645771

A proprioceptive role for an exteroceptive mechanoafferent neuron in Aplysia.

Borovikov D, Evans CG, Jing J, Rosen SC, Cropper EC.SourceDepartment of Physiology, The Mount Sinai Medical Center, New York, New York 10029, USA.
The Journal of neuroscience : the official journal of the Society for Neuroscience.J Neurosci.2000 Mar 1;20(5):1990-2002.
Afferent regulation of centrally generated activity is likely to be more complex than has been established. We show that a neuron that is an exteroceptor can also function as a proprioceptor. We study the Aplysia neuron B21. Previous data suggest that B21 functions as an exteroceptor during the radu
PMID 10684900