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Chapter 12
general & visceral senses
23
Anatomy
Undergraduate 2
01/30/2012

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Term
neuron stimulation
Definition
threshold reached, an action potential is generated & sensory impulse is propagated
Term
sensation
Definition
brain becomes aware of sensory impulses
Term
perception
Definition
brain interprets sensory impulses
Term
projection
Definition
brain projects sensation back to its apparent source
Term
sensory adaption
Definition
level of receptor doesn't reach threshold as often
Term
characteristics of general senses
Definition
ALL over body, NOT taste, smell, hearing
Term
free nerve endings
Definition
located in stratum spinosum, makes you itch
Term
tactile corpuscles
Definition
in dermis, light touch, feel insect crawling
Term
lamellated corpuscles
Definition
all over, even in organs, feel pressure
Term
Warm Receptors
Definition
most sensitive to above 77 unresponsive to above 113
Term
Cold Receptors
Definition
Sensitive to 50-68F
Term
role of nocireceptors
Definition
they protect because stimulated when tissues are damaged
Term
sensations of visceral pain
Definition
when visceral tissues are subject to more widespread stimulation a strong pain sensation, results from mechanoreceptor stimulation
Term
sensations of reeferred pain
Definition
visceral pain feels as if its coming from some place else
Term
acute pain pathway
Definition
thin, mylenated, conduct impulses quickly, associated with sharp pain originated in local area
Term
chronic pain pathway
Definition
unmylenated, slow impulses, cause dull aching sensation thats wide spread
Term
proprioception
Definition
mechanoreceptors that tell about body position & length/tension of muscles
Term
muscle spindles
Definition
in relaxed muscles, register the degree of stretch & initiate slight contraction if stretch excessive
Term
golgi tendon organs
Definition
measure degree of tension when muscle contracted & initiate relaxation if tension excessive
Term
visceral senses characteristics
Definition
sensory receptors are part of large, complex sensory organs in the head
Term
olefactory receptors
Definition
nerves exposed to outside
Term
olefactory epithelium
Definition
house olefactory cells, surrounds them with columnar epithelium
Term
ciliated bipolar neurons
Definition
project into nasal cavity, sensitive, cells respond to chem stimuli. require membrane receptors to do so
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