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Topic: Sensory receptor


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In the News (Mon 22 Jul 19)

  
  NationMaster - Encyclopedia: Special senses
A mechanoreceptor is a sensory receptor that responds to mechanical pressure or distortion.
In a sensory system, a sensory receptor is a structure that recognizes a stimulus in the internal or external environment of an organism.
However, touch (along with the senses of pressure, temperature, and pain) is one of the general senses that has small sensory receptors scattered throughout the body in the skin (for a further discussion, see chapter 4).
www.nationmaster.com /encyclopedia/Special-senses   (810 words)

  
 Effects of Deuterium Oxide on Mechano-Sensory Receptor -- Nakajima and Kuroda 73 (12): 4703 -- Proceedings of the ...
In the crayfish stretch receptor organ, a total substitution of D
O in the bathing solution produced a decrease in the amplitude of the receptor potential to a level of 34% of the control.
The electrical resistance of the receptor neuron was slightly increased by the D
www.pnas.org /cgi/content/abstract/73/12/4703   (164 words)

  
  Sensory Reception
Sensory receptors are specialized to respond to only certain stimuli, which will activate the receptor with weak or moderate levels of intensity.
The receptors for the gustatory nerves are known as taste buds located on the tongue and the roof of the mouth.
The receptor cells within the ommatidium each detect a very small fraction of the spectrum of light that the eye as a whole is exposed to; like the rods and cones of the vertebrate eye.
www.cartage.org.lb /en/themes/Sciences/Zoology/AnimalPhysiology/SensoryReception/SensoryReception.htm   (3978 words)

  
 SENSORY PHYSIOLOGY
The distal end of the 1st sensory fiber either acts as a sensory receptor or it may be activated by some specialized type of sensory receptor (for example, a Paccinian corpuscle in the dermis, or a hair cell in the cochlea).
Receptors for the special senses are separate cells, as in the case of rod and cone cells in the retina.
The entire "somatic sensory cortex" includes the "primary sensory cortex" (located in the post-central gyrus and also known as sensory area I) and the "sensory association area", as well as the "secondary sensory cortex" (located immediately behind the inferior portion of the primary sensory cortex).
faculty.etsu.edu /currie/study/sensory.htm   (3141 words)

  
 SMELL
Smells are detected in the nose by the specialised receptor cells of the olfactory epithelium.
There are two other proposed roles for these proteins as, (1) a transporter, in which they would bind to a receptor with the ligand and accompany it across the membrane and (2) as a terminator, causing "used" odorants to be taken away for degradation, allowing another molecule to interact with the receptor.
Receptors are therefore "tuned" to the vibrational frequency of particular odorants, rather like cones are "tuned" to particular wavelengths of light.
www.cf.ac.uk /biosi/staff/jacob/teaching/sensory/olfact1.html   (9408 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 may be a specialized portion of the plasma membrane, or a separate cell associated with a neuron ending.
A sensory receptor's adequate stimulus is the stimulus modality for which it possesses the adequate sensory transduction apparatus.
en.wikipedia.org /wiki/Sensory_receptor   (408 words)

  
 The Brain Explorer : Sensory receptor
Sensory receptor is a mechanism of the living organisms, in which through the sensory receptors, they have the ability to respond to both external and internal environment changes.
On the other hand, plants use their sensory receptors to situate the sources of light and to support themselves with gravity.
A sensory receptor, or sense cell, is a particular structure of the sensory nerve in which it is excited by a certain stimulus.
library.thinkquest.org /C0110299/mind/senses.php?page=senses1   (281 words)

  
 Sensory Receptor or Chemical Synaptic Potentials
Sensory perception begins with the stimulation of modified nerve endings (sensory receptors or sensory corpuscles) which relay information about sensory stimuli to the dendrites of our sensory relay nerves (first order sensory nerves).
Sensory nerves (b) have a little bit different profile from the standardized nerve pattern (a).
In sensory nerves, the cell body is deflected off to the side of the axon and the cell bodies of many of our sensory nerves are concentrated in the dorsal root ganglia of the spinal cord.
faculty.etsu.edu /currie/sensorychem.htm   (1076 words)

  
 SENSORY SYSTEMS   (Site not responding. Last check: )
sensory info from the legs is sent to the medial portion while info from the arms, head and face is sent to the most lateral regions of the cortex.
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.
Activation of descending inhibitory pathways activate inhibitory interneurons that terminate on the terminals of nociceptive neurons in the spinal cord and inhibit the release of substance P from the sensory fibers.
www.bioweb.uncc.edu /humanphys/sensory.htm   (2933 words)

  
 IUS Biology Faculty Edmonds Physiology Notes Sensory
Sensory organs provide the only channels of communication from the external (and internal) world to the nervous system.
Sensory receptors transduce (change) different energy forms into AP's that are conducted into the CNS by sensory neurons.
Each type of sensory receptor is highly selective and most sensitive to a particular modality (energy forms such as sound, light, pressure) to which it responds by ultimately causing the production of action potentials.
homepages.ius.edu /KEDMONDS/sensory.htm   (1288 words)

  
 Sensory neuron - Wikipedia, the free encyclopedia
'Sensory neurons('neurones) are nerve cells within the nervous system responsible for converting external stimuli from the organism's environment into internal electrical motor reflex loops and several forms of involuntary behavior, including pain avoidance.
In complex organisms, sensory neurons relay their information to the central nervous system or in less complex organisms, such as the hydra, directly to motor neurons and sensory neurons also transmit information to the brain, where it can be further processed and acted upon.
At the molecular level, sensory receptors located on the cell membrane of sensory neurons are responsible for the conversion of stimuli into electrical impulses.
en.wikipedia.org /wiki/Sensory_neuron   (233 words)

  
 Sensory Physiology   (Site not responding. Last check: )
The purpose of receptors is to convert a non-electrical stimulus into changes in membrane potential of nerves.
Receptor potentials: graded potentials in receptors that vary with strength of the stimulus.
Many receptors adapt to the presence of a stimulus and no longer send a signal until the stimulus stops.
eee.uci.edu /clients/dgromis/muscles/sensoryphysiology.htm   (819 words)

  
 The cerebral cortex
To give one example, a message may originate in a sensory receptor center and then travel to the thalamus, which would relay the information to a specific cortical area.
Signs and symptoms are also closely related because sensory, autonomic, and motor pathways are interlaced.
Sensory, autonomic, and motor stimuli may branch off and relay impulses to almost any area of the body.
www.neurokinesiology.org /The_Cerebral_Cortex   (1113 words)

  
 Basic Sensory Receptor Physiology
Receptors are termed selective because each type of receptor is highly specific (selective) with respect to the type of stimulus it responds to.
Although there are many different types of receptors, all receptors go about the actual transduction of stimulus into response in the same basic fashion.
Although there are differences in the details of function in various receptors, you now know the basics of how all receptors transduce the information contained in a stimulus and forward it to the brain.
www.unm.edu /%7Etoolson/Receptor_Function_Handout.html   (1161 words)

  
 Wasabi's kick linked to single pain receptor
A single pain receptor is responsible for the kick delivered by garlic and mustard oil, which is the active ingredient in mustard and in the pungent green sushi condiment known as wasabi, according to a Yale School of Medicine study published this week in Cell.
The sensory receptor also underlies the response to a variety of environmental irritants, such as acrolein, the researchers report.
In fact, the animals lacking the sensory gene did not flinch or try to lick when mustard oil was applied to their paws.
www.eurekalert.org /pub_releases/2006-03/yu-wkl032406.php   (426 words)

  
 DADiSP Application Briefs: Biomedical Engineering: Sensory Reception
The researchers specifically examined how a type of sensory receptor in the skin of a cat responds to certain kinds of mechanical stimulation such as vibration and pressure.
Sensory receptors are nerve cells that translate a stimulus into a patterned electrical signal that the nervous system uses for higher processing.
A receptor reacts to a stimulus by undergoing a complex
www.dadisp.com /ab19.htm   (280 words)

  
 Vestibular Disorders Association | Vertigo, Imbalance, Dizziness resources - Sensory Input
Nerve endings or sensory receptors in the back of the eye (retina) called rods and cones are sensitive to light.
The input received by the brain from the muscles and joints comes from proprioception—sensory receptors that are sensitive to stretch or pressure in the tissue that surrounds them.
Especially important are the impulses that come from your neck, which indicate the direction the head is turned, and the impulses that come from the ankles, which indicate the body's movement or sway relative to the ground while standing.
www.vestibular.org /vestibular-disorders/balance/sensory-input.php   (517 words)

  
 Monell CHemical Senses Center - NEUROSCIENCE AND MOLECULAR BIOLOGY
In the receptor cells, taste stimuli activate pathways that ultimately result in the release of neurotransmitter, which acts to change the activity of adjoining nerve fibers carrying signals to the brain.
Biochemical and biophysical studies are exploring the mechanisms that generate taste signals in the receptor cells, while molecular biological and molecular genetic techniques are being used to identify taste receptor proteins, ion channels, and components of the cellular second messenger pathways involved in generating taste responses.
This activates the formation of so-called “second messengers,” that modulate passage of ions through channels in the cell membrane, in turn generating nerve impulses that are transmitted directly to the olfactory bulbs.
www.monell.org /neuroscience.htm   (724 words)

  
 Olfaction - A Review
The olfactory region of each of the two nasal passages in humans is a small area of about 2.5 square centimeters containing in total approximately 50 million primary sensory receptor cells.
From the mitral cells the message is sent directly to the higher levels of the central nervous system in the corticomedial amygdala portion of the brain (via the olfactory nerve tract) where the signaling process is decoded and olfactory interpretation and response occurs.
This type of sensory "description" is often not just limited to the areas of the nose, mouth and eyes, but also occurs on skin areas not served by the 5th cranial nerve (especially, the genitalia) and thus such stimulants may effect a variety of nerve endings.
www.leffingwell.com /olfaction.htm   (819 words)

  
 Sensory Receptor Function
When the receptor potential = about 10mv (threshold), action potentials are produced at the first node followed by repolarization.
Tonic receptors - poorly adapting, transmit impulses for a long time, some tonic receptors are always active indicating background level.
Central part is wrapped by type Ia sensory fibers and the ends innervated by type II sensory fibers, both sensory fibers increase their output when the spindle is stretched, type Ia by the rate and amount of stretch, type II by the degree of stretch based on muscle tone.
www.mtsu.edu /~jshardo/bly2010/nervous/receptor.html   (656 words)

  
 Global flexibility in a sensory receptor: a site-directed cross-linking approach -- Falke and Koshland 237 (4822): 1596 ...
DE Koshland Jr The aspartate receptor of Escherichia coli and Salmonella typhimurium is a cell surface sensory transducer that binds extracellular aspartate and sends a transmembrane signal to the inside of the bacterium.
Seven different mutant receptors were constructed, each containing a single cysteine residue at a different position in the primary structure.
Detection of a Conserved alpha -Helix in the Kinase-docking Region of the Aspartate Receptor by Cysteine and Disulfide Scanning.
www.sciencemag.org /cgi/content/short/237/4822/1596   (1272 words)

  
 Three strategically placed hydrogen-bonding residues convert a proton pump into a sensory receptor -- Sudo and Spudich, ...
Three strategically placed hydrogen-bonding residues convert a proton pump into a sensory receptor -- Sudo and Spudich, 10.1073/pnas.0607467103 -- Proceedings of the National Academy of Sciences
Three strategically placed hydrogen-bonding residues convert a proton pump into a sensory receptor
The proton pump bacteriorhodopsin and the phototaxis receptor
www.pnas.org /cgi/content/short/0607467103v1?rss=1   (375 words)

  
 Abstract index
Expression of GDNF in the striatum by a lentiviral vector:Protection of the nigrostriatal DA pathway in the rat PD model
PACAP receptor deficient mice have an altered nociceptive behaviour during the formalin test
Anti-akinetic and anti-dyskinetic effects of adenosine A2A receptor antagonists in a rat model of Parkinson's disease
www.formonline.se /nd2001/abstracts   (436 words)

  
 The Biotech Weblog: March 2006
This grape variety is one of the first vines to be domesticated some 2,000 years ago which is grown...
Sensory Receptor Linked to Some Spices, Potential Pain Therapy Target Title: Sensory Receptor Linked to Some Spices, Potential Pain Therapy Target
According to a study done at Yale School of Medicine, a single pain receptor is responsible for the "kick" delivered by garlic and mustard oil (also the active ingredient in mustard and...
www.biotech-weblog.com /50226711/march_2006.php   (1951 words)

  
 Resources for the Brain Sciences
Eye, ear, skin, chemosensory models allow students to understand the organizatio of sensory receptor systems and the spinal cord.
Browse our models by visiting the sensory model product page.
It has been said that your always a "student" in the neurosciences, regardless of how long you've been in the business...
www.redreef.com   (947 words)

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