|
| |
| | Sensory neuron - Wikipedia, the free encyclopedia |
 | | In complex organisms like humans most sensory neurons also transmit information to the brain, where it can be further processed and acted upon. | | | Such connections between sensory and motor neurons underlie motor reflex loops and several forms of involuntary behavior, including pain avoidance. | | | In humans, such reflex circuits are commonly located in the spinal cord. |
|
http://en.wikipedia.org/wiki/Sensory_neuron
(273 words)
|
|
| |
| | The Somatic Sensory System |
| | This topological segregation of sensory neurons according to where they originate in the body is maintained through several synapses all the way up the spinal cord to the cerebral cortex of the brain. | | | If you recall our earlier discussions, sensory neurons are distributed throughout the body, but in vertebrates most have their cell body in clusters along the spinal cord called dorsal root ganglia, and whose axons enter the spinal cord in axon bundles called dorsal roots. | | | All sensory systems are organized in more or less the same way, so I'll first introduce some general principles of how the sensory nervous system works and then focus on the kinds of sensation that are detected by the somatic sensory (or somatosensory) system. |
|
http://www.lclark.edu/~reiness/neurobiology/Lectures/lecture18.htm
(3249 words)
|
|
| |
| | SENSORY SYSTEMS |
| | Secondary sensory neurons cross over the midline at the level of the spinal cord and ascend to the brain in the anterolateral pathway which is along the anterior and lateral portion of the spinal cord. | | | Unlike the neurons in the dorsal column pathway the majority of primary sensory neurons in this pathway synapse with secondary sensory neurons located in the spinal cord in the substantia gelatinosa (the uppermost layers of the dorsal horn). | | | The area of skin that a sensory neuron innervates is the receptive field for that particular neuron. |
|
http://www.bioweb.uncc.edu/humanphys/sensory.htm
(2933 words)
|
|
| |
| | Spinal Reflexes |
| | Sensory neuron synapses with interneurons in the spinal cord | | | Sensory neuron synapses with interneuron(s) in the spinal cord | | | Involves movements on the opposite side of the body for support or balance (fig. |
|
http://www.mtsu.edu/~jshardo/bly2010/nervous/reflexes.html
(424 words)
|
|
| |
| | Neurons |
| | 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. | | | These are found exclusively within the spinal cord and brain. |
|
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/N/Neurons.html
(453 words)
|
|
| |
| | Heterosynaptic Facilitation of Tail Sensory Neuron Synaptic Transmission during Habituation in Tail-Induced Tail and ... |
| | Castellucci VF, Pinsker H, Kupfermann I, Kandel ER (1970) Neuronal mechanisms of habituation and dishabituation of the gill-withdrawal reflex in Aplysia. | | | Kupfermann I, Castellucci V, Pinsker H, Kandel ER (1970) Neuronal correlates of habituation and dishabituation of the gill-withdrawal reflex in Aplysia. | | | In cellular studies of habituation, such as in the gill and siphon withdrawal reflex to tactile stimulation of the siphon of Aplysia, a mechanism that has emerged as an explanation for response decrement during habituation is homosynaptic depression at sensory neurons mediating the behavioral response. |
|
http://www.jneurosci.org/cgi/content/full/16/16/4933
(9303 words)
|
|
| |
| | Newton's Apple: Teacher's Guides |
| | These neurons are found in the central nervous system, which includes your brain and spinal cord, and the peripheral nervous system, which includes all the nerves that reach your body's extremities. | | | Sensory (or afferent) neurons carry messages to the brain and spinal cord. | | | Motor (or efferent) neurons carry messages away from the brain and spinal cord. |
|
http://www.ktca.org/newtons/13/rlxes.html
(1070 words)
|
|
| |
| | Untitled Document |
| | We are examining both the chronic and the acute effects of 5-HT and 20-HE upon this primary sensory neuron by examining the changes in firing frequency in response to a static stretch, characteristic of the relatively inactive periods of movement observed for crayfish in their natural settings. | | | The drive of the motor neurons can readily be examined by stimulation of various known sensory neurons, which enables one to assess their role in altering motor neuron activity. | | | Since the sensory axons are very small (1 to 10 µm) and difficult to monitor over time while changing the bathing medium, the entire distal 2nd root was monitored after it was transected from the ganglia. |
|
http://www.as.uky.edu/Biology/faculty/cooper/SensoryPage.htm
(4474 words)
|
|
| |
| | [No title] |
| | The function of "association" neurons in reflexes is to a. | | | As it does so, extensor muscles in the front leg on that same side of the body will increase their activity due to excitation of extensor muscle motor neurons by a. | | | of sensory feedback onto a central pattern generator. |
|
http://soma.npa.uiuc.edu/courses/bio303/TestBank/Ch16key.txt
(1458 words)
|
|
| |
| | Max Meyer: The Fundamental Laws of Human Behavior: Third Lecture |
| | 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. | | | represent all those sensory neurons any excitation of which is likely to interfere, if the corresponding reflex responses are allowed, with the performance of the instinctive activity. | | | The muscle fiber does not contract at the very moment when the sensory point is excited, but some time later,— the later, the longer the nervous path connecting the sensory and the motor point. |
|
http://spartan.ac.brocku.ca/~lward/Meyer/1911/1911_04.html
(3504 words)
|
|
| |
| | Howstuffworks "How Your Brain Works" |
| | The simplest type of neural pathway is a monosynaptic (single connection) reflex pathway, like the knee-jerk reflex. | | | Neurons also vary with respect to their functions: | | | Interneurons connect various neurons within the brain and spinal cord. |
|
http://science.howstuffworks.com/brain2.htm
(294 words)
|
|
| |
| | [No title] |
| | Extracellular recordings are used to study neurons in the central nervous system: Much of what we know about the processing of somatic sensory information in the brain, particularly in the cerebral cortex, has been learned from studies of monkeys. | | | Furthermore, psychophysical measurement of somatosensory discriminative abilities indicate that humans and monkeys experience the same tactile sensations in their hands when they feel vibration, palpate objects or touch a textured surface. | | | This technique, termed micromapping, forms the experimental foundation for what we know about the columnar and somatotopic organization of the cortex. |
|
http://www.bme.jhu.edu/~reza/Courses/physfound_files/xwang_4notes.doc
(2550 words)
|
|
| |
| | Piali Sengupta |
| | Moreover, the sensory neurons and the underlying neuronal circuits required for these behaviors have been identified. | | | For instance, thermosensory neurons allow us to sense ambient temperature, while olfactory and gustatory neurons are responsible for our complex senses of smell and taste. | | | Our goal is to understand the neuronal circuits underlying this fascinating behavior, and to identify the molecules required for sensing and remembering temperature. |
|
http://www.bio.brandeis.edu/faculty01/sengupta.html
(1062 words)
|
|
| |
| | Basic Sensory Receptor Physiology |
| | The first part on the sensory neuron that does have the voltage-gated Na channels required for action potential generation is the 1 | | | The tip of the sensory neuron, however, is like the dendritic zone of a neuron in that it lacks voltage-gated Na channels and therefore cannot generate or propagate action potentials, so you can think of this depolarization as a large-amplitude EPSP (dV | | | Depending on the nature of the change in V |
|
http://www.unm.edu/~toolson/Receptor_Function_Handout.html
(1161 words)
|
|
| |
| | Sensory Receptors |
| | After a sensory stimulus has been given, when do we stop feeling (seeing, smelling, hearing, or tasting) it? | | | This action potential will run all the way down the axon (bypassing the cell body in the DRG) and enter the dorsal horn of the spinal cord. | | | We did a lab experiment on this (the one with the coins). |
|
http://distance.stcc.edu/AandP/AP/AP2pages/Units14to17/unit15/sensory.htm
(979 words)
|
|
| |
| | Re: How does 'sensitization' of neurons work? |
| | Neural sensitization is the process by which the response of a neuron to a given stimulus is increased. | | | This physical change in neuronal connection underlies long-term sensitization. | | | In the short term, the opening and closing of ion channels in the sensory and motor neurons are altered to produce a greater motor neuron and behavioral response. |
|
http://www.madsci.org/posts/archives/aug2001/999018854.Ns.r.html
(800 words)
|
|
| |
| | Sengupta Lab - John Satterlee Profile |
| | In particular, I am interested in the AFD neurons, which are the pair of neurons responsible for thermosensation. | | | This mutant snd-6(oy28)V has been mapped to LG V. Behavioral assays on snd-6 indicate that this mutant is not defective in AWA, AWC, ASE, and ASH functions, and preliminary experiments suggest this mutant is also not thermotaxis defective. | | | This specificity is mediated by the expression of particular combinations of receptors and signal transduction molecules in each sensory neuron. |
|
http://www.bio.brandeis.edu/senguptalab/satterlee2.html
(900 words)
|
|
| |
| | Untitled Document |
| | The purpose of the nervous system is to collect and integrate information from both external and internal sources and to use that information as a basis for behavior that is significant to the survival of the individual and the species. | | | Brushing against an object, such as a leaf, bends the hair and provides a mechanical stimulus. | | | A sensory neuron innervates a sense receptor, which is a structure modified to detect a specific form of sensory stimulus. |
|
http://entochem.tamu.edu/neurobiology/text.html
(2042 words)
|
|
| |
| | sensory neuron - definition of sensory neuron by the Free Online Dictionary, Thesaurus and Encyclopedia. |
| | sensory neuron - a neuron conducting impulses inwards to the brain or spinal cord | | | sensory nerve - a nerve that leads from receptors toward or to the central nervous system | | | This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. |
|
http://www.thefreedictionary.com/sensory+neuron
(110 words)
|
|
| |
| | reflex - Hutchinson encyclopedia article about reflex |
| | Examples of such reflexes include the sudden withdrawal of a hand in response to a painful stimulus, or the jerking of a leg when the kneecap is tapped. | | | The tap stimulates an impulse in the sensory neuron in the leg, which travels to the spinal cord, through the relay neuron, and into the motor neuron where it stimulates the leg muscle to contract. | | | Sensory cells (receptors) in the knee send signals to the spinal cord along a sensory nerve cell. |
|
http://encyclopedia.farlex.com/reflex
(493 words)
|
|
| |
| | SENSORY NEURON ADDITION IN RAT |
| | Recently, we extend our studies to the rat and showed that the number of neurons in sensory ganglia of the lumbar spinal cord is 20-30% greater in 8-0-day rats than in neonates (Popken and Farel, J. Comp. | | | Our work in frog shows that neurons may be added by a mechanism other than the birth of new cells. | | | This increase is demonstrable using estimates of neuron number based on counts of neuronal profiles or a stereological method, the physical disector. |
|
http://www.med.unc.edu/wrkunits/1dean/research/Farel104.html
(322 words)
|
|
| |
| | NEUROPHYSIOLOGY |
| | Anatomy - Cross section of Spinal cord at the level of a spinal nerve. | | | Contralateral - response on opposite side from stimulus (requires commissural neuron). | | | interneurons (=internuncial neurons) - connect sensory and motor on the same side of the body. |
|
http://csm.jmu.edu/biology/garrisne/physiology/Neurophysiology.htm
(230 words)
|
|
| |
| | UCLA Department of Physiological Science-- Homepage of Reggie Edgerton |
| | Edgerton, V.R., de Leon, R.D., Tillakaratne, N., Recktenwald, M.R., Hodgson, J.A., and Roy, R.R. Use-dependent plasticity in spinal stepping and standing Advances in Neurology: Neuronal Regeneration. | | | In our experiments we also study cell and tissue properties (nerve and muscle) that are important in generating the behavioral characteristics observed. | | | Approach: My lab has a very multidisciplinary and integrative approach to science. |
|
http://www.physci.ucla.edu/physcifacultyindiv.php?FacultyKey=82
(9063 words)
|
|
| |
| | Sensory receptor - Wikipedia, the free encyclopedia |
| | In a sensory system, a sensory receptor is a structure that recognizes a stimulus in the internal or external environment of an organism. | | | The sensory receptor functions as the first component in a sensory system. | | | Odor receptors in olfactory receptor neurons, for example, are activated by interacting with molecular structures on the odor molecule. |
|
http://en.wikipedia.org/wiki/Sensory_receptor
(384 words)
|
|
| |
| | Hexapedia - Olfactory receptor neuron |
| | Most neurons in other parts of the nervous system cannot be replaced, so research focusing on how stem cells differentiate into olfactory sensory neurons could lead to the use of these stem cells to replace damaged or degenerated neurons in the brain, spinal cord, or other parts of the nervous system. | | | An olfactory receptor neuron, also called an olfactory sensory neuron, is the primary transduction cell for olfaction in the olfactory system. | | | Many tiny hair-like cilia protrude from the olfactory receptor cell's dendrite into the mucus covering the surface of the olfactory epithelium. |
|
http://www.hexafind.com/encyclopedia/Olfactory_receptor_neuron
(319 words)
|
|
| |
| | Nervous Tissue Workshee |
| | Neurons of the Sciatic nerve | | | Somatic motor neurons innervate _____________ muscle tissue, causing __________________. | | | In what regions of the body are the cell bodies and axon terminals of sensory neurons located ? |
|
http://bhs.deanza.edu/faculty/vAnnen/NervousTissueWorkshee.htm
(301 words)
|
|
| |
| | Untitled Document |
| | 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. | | | Here are two views of the same network of neurons showing the patterns of activity that occur with two sensory stimuli in different locations. | | | The somatosenory system is built in a way that allows it to "know" the location of stimulus. |
|
http://www.indiana.edu/~phys215/discuss/D6/fall04L.html
(371 words)
|
|
| |
| | Sensory neuron definition - Medical Dictionary definitions of popular medical terms |
| | Sensory neuron definition - Medical Dictionary definitions of popular medical terms | | | MedicineNet Home > MedTerms medical dictionary A-Z List > Sensory neuron | | | Sensory neuron: A neuron that receives electrical input signals from sensory cells and from other neurons. |
|
http://www.medterms.com/script/main/art.asp?articlekey=23286
(141 words)
|
|
| |
| | Michael Richardson - research on evolution and development |
| | Francis PH Richardson MK Brickell P and Tickle C (1994) Bone morphogenetic proteins and a signalling pathway that controls patterning in the developing chick limb. | | | Richardson MK and Sieber-Blum M (1992) Pluripotent neural crest cells in the developing skin of the quail embryo. | | | Sieber-Blum M Ito K Richardson MK Langtimm C and Duff RS (1992) Distribution of pluripotent neural crest cells in the embryo and the role of brain-derived neurotrophic factor (BDNF) in the commitment to the primary sensory neuron lineage J. |
|
http://www.mk-richardson.com/Publications.htm
(1198 words)
|
|
| |
| | [No title] |
| | Question 3: Definitions Sensory Neuron: a neuron that responds to an environmental stimulus and transduces that stimulus into action potential, allowing for delivery of info to higher neural levels. | | | NucleusCranial Nerve SupplyEdinger-Westphal NucleusOculomotor Nerve (CN 3)—located on dorsal side of Oculomotor nucleusSuperior salivatory nucleusFacial Nerve (CN 7)Inferior salivatory nucleusGlossopharyngeal Nerve (CN 9)Dorsal motor nucleus of CN 10Vagus Nerve (CN 10)—only one big enough to see on slides Question 8: ID the cranial nerve equivalent of postganglionic ANS neurons What is located at sympathetic ganglia? |
|
http://www.muhealth.org/~md2004/draft3/1-23brain3.doc
(206 words)
|
|
| |
| | Publications |
| | - Yu, H., Prétôt, R.F., Bürglin, T.R., and Sternberg, P.W. Distinct roles of transcription factors EGL-46 and DAF-19 in specifying the functionality of a polycystin-expressing sensory neuron necessary for C. | | | - Cassata, G., Röhrig, S., Kuhn, F., Hauri, H.-P., Baumeister, R., and Bürglin, T.R. The Caenorhabditis elegans Ldb/NLI/Clim orthologue ldb-1 is required for neuronal function. | | | - Miller, D.M., Shen, M.M., Shamu, C.E., Bürglin, T.R., Ruvkun, G., Dubois, M.L., Ghee, M., and Wilson, L. elegans unc-4 gene encodes a homeodomain protein that determines the pattern of synaptic input to specific motor neurons. |
|
http://www.cnt.ki.se/groups/tbu/research/publications.html
(1272 words)
|
|
|
