Lecture 1 Flashcards
Type 1a or Aalpha fibers are what calssification/ use?
These are myelinated from annilospiral endings innervating muscle spindles.
What do type IB or Aalpha fibers innervate? Are they myelinated?
These are myelinated and innervate the Golgi tendon organs.
What role do A alpha fibers play in the cerebellum?
These guys return infromation from the muscles allowing for proprioception and determination of where the body is in space.
What Role do the A alpha fibers play in the dorsal column pathways?
These relay fine detailed discrimitive touch including flutter, and vibratory sense.
What responsibility do Type II or AB fibers play?
Are they myelinated?
These are myelinated fibers that are formed from flower spray endings innervating muscle spindles.
These are cutaneous tactile receptors.
What responsibility do Type III or Adelta fibers have?
Are these myelinated?
These receptors are lightly myelinated and relay pain, temperature, and crude touch.
these fibers also relay sharp, well-localized pain.
what are Type IV or C fibers responsible for?
Are they myelinated?
These are unmyelinated fibers that relay dull, poorly localized pain and temperature.
What function do extero receptors have?
These receptors are close to the body surface and respond to sensory stimuli from the environment.
Thin: Smell, sight, gustatory, auditory, tactile, temperature, flutter/vibration.
What classifications do Exteroreceptors have?
Classified as either teloreceptors or contact receptors.
What stimuli do teloreceptors respond to?
Respond to stimulus from a distance not requiring contact.
Examples would be light and sound.
What stimuli do contact receptors respond to?
Require contact!
Touch, pressure, pain, temperature, chemicals (olfactory gustatory)!
Chemo receptors and baroreceptors are examples what what broad category of receptors?
Interoreceptors!
What two types of receptors are involved in making up Noci receptors?
Type Adelta (Lightly myelinated)
and
Type C fibers (unmyelinated)
What receptor types make up the mechanosensitive nocireceptors?
Alpha delta fibers responding to excessive mechanical stimulation or tissue injury.
What receptor types make up the temeprature-sensitive nocioreceptors?
Terminals of alphadelta and C fibers
which respond to intese heat or cold.
What type of fibers make up polymodal nocireceptors and what do they do?
Terminals of C fibers and these act by responding to various noxious stimuli.
Pruriceptors work primarily through what type of receptor?
Work through Type C fibers responds to histamine producing an itchy sensation.
Which two receptor types make up Thermoreceptors?
Adelta and C fibers
Cold receptors encompass what receptor type?
ADelta fibers.
Warmth receptors use what free nerve ending fiber type?
These use Warmth receptors and detect increase in temeprature.
What are the three nonencapsulated mechanoreceptor types?
Free nerve endings
Peritrichial nerve endings
And
Tactile receptors
What nerve fibers make up the Free nerve endings in the nonencapsulated mechanoreceptor category?
Adelta and C fibers
Respond to touch pressur pain and temperature.
What fibers compose the Peritrichial nerve endings?
AB fibers.
What fibers compose the tactile receptors/merkel discs?
AB
What function do Merkel discs have?
Where can these be found?
Respond to fine detailed touch sensation (Shape, texture, edges)
Found in the lower epidermis and upper dermis.
