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Different sensory receptors are classified by what?
Location, type of stimulus or complexity.
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List the types of sensory receptors categorized by location.
Exteroceptors, interoceptors and proprioceptors.
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Where are exteroceptors located?
They are located beneath the surface of the skin and sense touch, pain, temperature, vision, etc.
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Where are interoceptors located?
They are located deep inside the body (ie., viscera, blood vessels, etc.)
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Where are proprioceptors located?
They are located inside deeper than the surface of the skin, but not as deep as the viscera (ie., skeletal muscles, joints, etc.)
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What do mechanoceptors sense?
Touch & pressure
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What do termoceptors sense?
Temperature
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What do photoceptors sense?
Light
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What do chemoceptors sense?
Chemicals
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What do nociceptors sense?
Pain
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Give examples of complex sensory receptors.
Eye, ear, taste (special senses)
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Give examples of simple sensory receptors.
Unencapsulated and encapsulated (general senses)
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Name the different types of unencapsulated simple sensory receptors.
Free (sense heat and cold/thermoceptors) & modified: Merkel discs & root hair plexus (light touch/exteroceptors)
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Name the different types of encapsulated simple sensory receptors.
Meissner's corpuscles, Krauses's end bulbs, Pacinian corpuscles, Ruffini's corpuscles, Muscle spindles, Golgi tendon organs & joint kinesthetic receptors.
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Meissner's Corpuscles
Cigar like sensory receptors which sense light touch
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Krausses's end bulbs
Encapsulated sensory receptors located in mucosa which sense light touch
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Pacinian Corpuscles
Encapsulated, onion like sensory receptors which sense deep pressure
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Ruffini's Corpuscles
Encapsulated sensory receptors which sense deep pressure and stretch
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Muscle spindles
Encapsulated sensory receptors which work against overstretch
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Golgi Tendon Organs
Encapsulated sensory receptors which work against overstretch
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Joint Kinesthetic Receptors
Combination of Pacinian corpuscles, Ruffini corpuscles, Golgie tendon organs and free sensory receptors located in joints
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Cranial Nerve I
Olfactory nerve (smell)
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Cranial Nerve II
Optic (vision)
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Cranial Nerve III
Oculomotor. Efferent (motor) fibers. Controls cilliary muscle, sphincter of pupil and aall external eye muscles, except those controlled by cranial nerves IV & VI.
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Cranial Nerve IV
Trochlear (controls the superior oblique muscle) (efferent (motor) fibers)
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Cranial Nerve VI
Abducens (controls the lateral rectus muscle) (efferent (motor) fibers)
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Cranial Nerve V
Trigeminal (sensory - face, sinuses, teeth) (motor - muscles of mastication) (mixed fibers)
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Cranial Nerve VII
Facial (muscles of face) (motor - submandibular, sublingual, lacrimal glands) (sensory - anterior 2/3 of tongue, soft palate) (mixed fibers)
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Cranial Nerve VIII
Vestibulocochlear (hearing)
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Cranial Nerve IX
Glossopharyngeal (sensory - posterior 1/3 of tongue, tonsil, pharynx, middle ear) (motor - stylopharyngus, upper pharyngeal muscles, parotid gland) (mixed fibers)
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Cranial Nerve X
Vagus (motor - heart, lungs, palate, pharynx, larynx, trachea, bronchi, G.I. tract) (sensory - heart, lungs, trachea, bronchi, larynx, pharynx, G.I. tract, external ear) (mixed fibers)
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Cranial Nerve XI
Accessory (sternocleidomastoid, trapezius) (efferent (motor) fiber)
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Cranial Nerve XII
Hypoglossal (tongue muscles & strap muscles by ansa cervicalis) (efferent (motor) fibers)
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