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The Peripheral Nervous System (PNS) > Sensory Receptors
Sensory Receptors
• Classification of Receptors by Stimulus
• Classification of Receptors by Location
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The Peripheral Nervous System (PNS) > Sensory Receptors
Classification of Receptors by Stimulus
• Chemoreceptors detect the presence of chemicals.
• Thermoreceptors detect changes in temperature.
• Mechanoreceptors detect mechanical forces.
• Photoreceptors detect light during vision.
• More specific examples of sensory receptors are baroreceptors, propioceptors,
hygroreceptors, and osmoreceptors.
• Sensory receptors perform countless functions in our bodies mediating vision,
hearing, taste, touch, and more.
A schematic of the classes of sensory receptors
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The Peripheral Nervous System (PNS) > Sensory Receptors
Classification of Receptors by Location
• Sensory receptors that share a common location often share a related function.
• Sensory receptors code four aspects of of a stimulus: modality (or type), intensity,
location, and duration.
• Cutaneous touch receptors and muscle spindle receptors are both
mechanoreceptors, but they differ in location.
Muscle spindle
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Appendix
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The Peripheral Nervous System (PNS)
Key terms
• baroreceptor A nerve ending that is sensitive to changes in blood pressure.
• cutaneous touch receptor A type of sensory receptor found in the dermis or epidermis of the skin.
• mechanoreceptor Any receptor that provides an organism with information about mechanical changes in its environment such
as movement, tension, and pressure.
• muscle spindle Sensory receptors within the belly of a muscle, which primarily detect changes in the length of this muscle.
• photoreceptor A specialized neuron able to detect and react to light.
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The Peripheral Nervous System (PNS)
A schematic of the classes of sensory receptors
Sensory receptor cells differ in terms of morphology, location, and stimulus discriminated.
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Wikimedia. "Structure of sensory system (4 models) E." CC BY-SA 3.0 http://commons.wikimedia.org/wiki/File:Structure_of_sensory_system_(4_models)_E.PNG
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The Peripheral Nervous System (PNS)
Muscle spindle
Mammalian muscle spindle showing typical position in a muscle (left), neuronal connections in spinal cord (middle), and expanded schematic (right). The
spindle is a stretch receptor with its own motor supply consisting of several intrafusal muscle fibers. The sensory endings of a primary (group Ia) afferent
and a secondary (group II) afferent coil around the non-contractile central portions of the intrafusal fibers.
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Wikipedia. "Muscle spindle model." Public domain http://en.wikipedia.org/wiki/File:Muscle_spindle_model.jpg View on Boundless.com
The Peripheral Nervous System (PNS)
Sensory receptors broadly respond to one of four stimuli. Which
one of these stimuli is NOT correctly described?
A) taste buds respond to the differing chemical qualities of foods via
chemoreceptors
B) skin responds to differing temperatures via thermoreceptors
C) muscles respond to the pressure of movements at joints via
baroreceptors
D) eyes respond to varying light intensity and colors via rod and cone
photoreceptors
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The Peripheral Nervous System (PNS)
Sensory receptors broadly respond to one of four stimuli. Which
one of these stimuli is NOT correctly described?
A) taste buds respond to the differing chemical qualities of foods via
chemoreceptors
B) skin responds to differing temperatures via thermoreceptors
C) muscles respond to the pressure of movements at joints via
baroreceptors
D) eyes respond to varying light intensity and colors via rod and cone
photoreceptors
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Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/
The Peripheral Nervous System (PNS)
Sensory receptors are found throughout the body. Those that
share a common location tend to share a common or related
function. An example is:
A) receptors in retinas are mostly photoreceptors for vision
B) receptors in skin are mostly mechanoreceptors for touch
C) receptors in ears are mostly mechanoreceptors for hearing
D) receptors in muscles are mostly baroreceptors for movement
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The Peripheral Nervous System (PNS)
Sensory receptors are found throughout the body. Those that
share a common location tend to share a common or related
function. An example is:
A) receptors in retinas are mostly photoreceptors for vision
B) receptors in skin are mostly mechanoreceptors for touch
C) receptors in ears are mostly mechanoreceptors for hearing
D) receptors in muscles are mostly baroreceptors for movement
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Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/
The Peripheral Nervous System (PNS)
Attribution
• Wikipedia. "Sense." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sense#Traditional_senses
• Wikipedia. "Sense." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sense#Traditional_senses
• Wikipedia. "Sense." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sense#Other_internal_senses
• Wikipedia. "Sense." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sense#Traditional_senses
• Wikipedia. "Sense." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sense#Other_senses
• Wikipedia. "Sense." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sense#Other_senses
• Wikipedia. "Sense." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sense#Other_senses
• Wikipedia. "Sense." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sense#Other_senses
• Wikipedia. "Sense." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sense#Traditional_senses
• Wikipedia. "Sense." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sense#Traditional_senses
• Wikipedia. "Sensory receptors." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sensory_receptors#by_adequate_stimulus
• Wikipedia. "Sensory receptors." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sensory_receptors#by_adequate_stimulus
• Wiktionary. "mechanoreceptor." CC BY-SA 3.0 http://en.wiktionary.org/wiki/mechanoreceptor
• Wiktionary. "photoreceptor." CC BY-SA 3.0 http://en.wiktionary.org/wiki/photoreceptor
• Wiktionary. "baroreceptor." CC BY-SA 3.0 http://en.wiktionary.org/wiki/baroreceptor
• Wikipedia. "Hair cell." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Hair_cell
• Wikipedia. "Sensory system." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sensory_system
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The Peripheral Nervous System (PNS)
• Wikipedia. "Sensory receptor." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sensory_receptor#by_location
• Wikipedia. "Sensory neuron." CC BY-SA 3.0 http://en.wikipedia.org/wiki/Sensory_neuron#Types_and_function
• Wikipedia. "muscle spindle." CC BY-SA 3.0 http://en.wikipedia.org/wiki/muscle%20spindle
• Wikipedia. "cutaneous touch receptor." CC BY-SA 3.0 http://en.wikipedia.org/wiki/cutaneous%20touch%20receptor
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