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Piali Sengupta We are investigating the molecular mechanisms that define the sensory properties of individual sensory neuron types in C. First, distinct sensory neuron subtype identities appear to be specified by members of different transcription factor families. Fourth, combinatorial transcription factor codes appear to specify neuronal identities and finally, general sensory neuron characteristics appear to be specified in parallel to subtype-specific properties. www.bio.brandeis.edu /faculty01/sengupta.html   (1062 words)

Howstuffworks "How Your Brain Works" For example, a single sensory neuron from your fingertip has an axon that extends the length of your arm, while neurons within the brain may extend only a few millimeters. Motor neurons that control muscle contractions have a cell body on one end, a long axon in the middle and dendrites on the other end; sensory neurons have dendrites on both ends, connected by a long axon with a cell body in the middle. The sensory neuron passes the message to a motor neuron that controls your leg muscles. science.howstuffworks.com /brain2.htm   (294 words)

Heterosynaptic Facilitation of Tail Sensory Neuron Synaptic Transmission during Habituation in Tail-Induced Tail and ... The decrement in the siphon sensory neurons was produced by repeated intracellular activation of the sensory cells, intercalated between water jet stimuli to the siphon. Castellucci VF, Pinsker H, Kupfermann I, Kandel ER (1970) Neuronal mechanisms of habituation and dishabituation of the gill-withdrawal reflex in Aplysia. Stopfer M, Carew TJ (1994) Homosynaptic depression in tail sensory neurons is not the mechanism of habituation of tail-induced tail or siphon withdrawal in Aplysia. www.jneurosci.org /cgi/content/full/16/16/4933   (9303 words)

[No title]   (Site not responding. Last check: 2007-10-24) The function of an association neuron in a reflex arc is probably NOT a. The function of "association" neurons in reflexes is to a. Wilson's model of the network of neurons controlling the activity of elevator and depressor muscles of a locust wing is based primarily on a. soma.npa.uiuc.edu /courses/bio303/TestBank/Ch16key.txt   (1458 words)

Max Meyer:  The Fundamental Laws of Human Behavior:  Third Lecture Each sensory and each motor point of the body contains one of the ends of a neuron which, accordingly, may be called either a sensory neuron or a motor neuron. The peripheral points are not always located on the anatomical periphery of the body, the skin;— some sensory points are located in the skin and some in the inner parts of the body, whereas the motor points, in muscle fibers, are necessarily, without exception beneath the skin. We are, then, probably justified in regarding the conduction of an excitation through a neuron as, not identical with, but at least analogous to the wandering of ions through the conducting fluid—the electrolyte, to use the technical term—of a storage battery. spartan.ac.brocku.ca /~lward/Meyer/1911/1911_04.html   (3504 words)

Neurons   (Site not responding. Last check: 2007-10-24) The cell bodies of the sensory neurons leading to the spinal cord are located in clusters, called ganglia, next to the spinal cord. The diagram is a simplified view of the relationship between sensory and motor neurons running to and from the spinal cord. Most motor neurons are stimulated by interneurons, although some are stimulated directly by sensory neurons. users.rcn.com /jkimball.ma.ultranet/BiologyPages/N/Neurons.html   (453 words)

An Unbiased cDNA Library Prepared from Isolated Aplysia Sensory Neuron Processes Is Enriched for Cytoskeletal and ... Isolated sensory neurites were free of glia, as shown by propidium iodide (red) staining of sensory cell cultures before (D) and after (E) removal of cell bodies, which shows that there is no DNA left after removal of the sensory cell somata. Sensory neurons were cultured for 5 d in isolation (A, C) or in synaptic contact with the motor neuron (B), fixed, and hybridized with antisense (A, B) and sense (C) riboprobes to Aplysia Sensory cells were cultured for 5 d, at which time the cell bodies and 50-100 µm of the proximal axon segments were removed using a sharp microelectrode. www.jneurosci.org /cgi/content/full/23/28/9409   (6428 words)

Citebase - On the origins of aperiodicities in sensory neuron entrainment Aperiodic entrainment to rhythmic sensory input was obtained with either a single neuron or an excitatory network model, without addition of a stochastic or "noisy" element. The entrainment properties of primary sensory neurons were well captured by the dynamics of the Hodgkin-Huxley ordinary differential equations with a quiescent resting state or threshold for spike output. When the rhythmically activated neuron was embedded in an excitatory network of Hodgkin-Huxley neurons with heterogeneous synaptic delays, aperiodic entrainment patterns were more frequently encountered and these were associated with asynchronous output from the network. www.citebase.org /cgi-bin/citations?id=oai:cogprints.soton.ac.uk:8   (1210 words)

Sengupta Lab - John Satterlee Profile This specificity is mediated by the expression of particular combinations of receptors and signal transduction molecules in each sensory neuron. In particular, I am interested in the AFD neurons, which are the pair of neurons responsible for thermosensation. I am examining the mechanism by which the fates and functions of the thermosensory neurons are specified, by identifying genes that work in a cascade to direct expression of these in vivo markers. www.bio.brandeis.edu /senguptalab/satterlee2.html   (900 words)

Untitled Document   (Site not responding. Last check: 2007-10-24) A receptive field is the part of the world to which a sensory neuron pays attention. Here are two views of the same network of neurons showing the patterns of activity that occur with two sensory stimuli in different locations. b) he feels some kind of sensory stimulation but we can't begin to predict where because the inputs from different parts of the body are all mixed up in the somatosensory cortex and there's no consistent map of the body. www.indiana.edu /~phys215/discuss/D6/fall04L.html   (371 words)

Drosophila Regulatory factor X is necessary for ciliated sensory neuron differentiation -- Dubruille et al. 129 (23): ... neurons and neuronal precursors but not in photoreceptors. The bristle sensory organ is composed of a hollow hair shaft and three cells: the socket cell, the sheath cell and a ciliated mechanosensory neuron. The sensory cilium is composed of 9+0 microtubule doublets. dev.biologists.org /cgi/content/full/129/23/5487   (6773 words)

Spinal Reflexes Pain receptor is stimulated by a painful stimulus and causes the sensory neuron to fire Sensory neuron synapses with interneurons in the spinal cord Collateral branch of the excitatory interneuron extends across the gray commissure to the motor neuron of the extensor muscle on the opposite side of the body www.mtsu.edu /~jshardo/bly2010/nervous/reflexes.html   (424 words)

Early specification of sensory neuron fate revealed by expression and function of neurogenins in the chick embryo -- ... Early specification of sensory neuron fate revealed by expression and function of neurogenins in the chick embryo -- Perez et al. Early specification of sensory neuron fate revealed by expression and function of neurogenins in the chick embryo Comparison of the generic neuronal differentiation and neuron subtype specification functions of mammalian achaete-scute and atonal homologs in cultured neural progenitor cells dev.biologists.org /cgi/content/abstract/126/8/1715   (1299 words)

NEUROPHYSIOLOGY interneurons (=internuncial neurons) - connect sensory and motor on the same side of the body. commissural neurons - connect sensory and motor on opposite sides of the body. Autonomic - strictly motor, and the neurons make one synaptic connection in a ganglion in route to the target organ. csm.jmu.edu /biology/garrisne/Physiology/Neurophysiology.htm   (230 words)

Sensory Neuronopathies Neurons (PNS and CNS); Adenohypophesis; Adrenal cortex; Retina Hu is a family of 35 to 40 kDA neuronal nuclear proteins Dorsal root ganglion inflammation and neuronal loss: Patchy www.neuro.wustl.edu /neuromuscular/antibody/sneuron.html   (473 words)

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