Physiology [CNS] Flashcards
Whats the receptors and thier function?
- specialized structures at the periphery of the affernt nerve respose to stimuli
- act as transducers covert the stimuli from thermal , chemical or physical to electrical activity or depolarization
Classifications of the receptors histologically?
-Free(bare)nerve endings
.no neurolemma or mylen sheath
.slowly to moderately adopted
.in all tissues more in skin
.for pain , crude touch, temperature
-capsulated receptors
•hair follicles receptors in hairy skinn for crude touch
•meissner in non hairy skin at the tip of the fingers and lips for vibration and fine touch
•pasinian in submucus tisse in joints and ligaments for fine touch, pressure, vibration,sense of movements
-expanded nerve endings
•Merkel discs at the tip of fingers and lips for fine touch
•Ruffni for pressure, fine touch and sense of position
•krsuse bulb
The receptors According thier stimuli classified into?
- mechanoreceptors
- chemoreceptors
- thermoreceptors
- pain receptors [nocicdptors]
- photoreceptors [electromagnatic ]
The mechano receptors includes?
- stretch receptors in skeletal muscles [muscle spindle] and blood vessels wall
- tension receptors [golgi tendon organs]
- touch and pressure inthe skin
- joint receptors for sense of movements and posterior
- auditory receptors [organ of corti]
- vistibular reciptors[maculaand crista ampularies
chemo receptors incules?
-External:exogenous stimuli [smell-taste]
-internal: endogenous stimuli
•O andCo2 in bodie of carotid and aorta center in medulla
•glucoreceptors and osmoreceptors [in hypothalamus]
Whats the thermoreceptors?
cold and hot receptors
Whats the pain receptors?andits other name?
- due to damage of tissue
- nociceptors
What are the photoreceptors?its located?other name?
Respond to light wavas in rods and cones in retina
-light or electromagnetic receptors
According to thier sites the receptors are classified into?
- superficial [extero receptors]
- deep[properioceptors]
- viseral
The superficial receptors lacated? Includes? And other name?
- in the skin and subcutaneous
- free nerve endings for pain temperature and crude touch
- hair follicles, pacinian, messiener,merkel for touch
The deep receptors location ? Name? Includes?
- deep to the skin
- properioceptors
- free nerve endings for pain
- pacinian in joint capsul for sense of movements
- ruffni in joint capsule for sense of position
- muscle spinde for stretch
- golgi tendon for sense of tension
The visceral receptors location? Includes?
In viscera
- free nerve endings for pain
- stretch receptors for hollow viscra
- chemoreceptors bodies of aorta and carotid
Whats the muller law of specific nervous energy
-each receptor is specific for one sensation only called modulity how ever the method of stimulation are
Whats the adaptation of receptors?
-gradual decrease in response even with constant stimulation
What are the 3 type of receptor adaptation?
- slowly [tonic-static] includes pain and mechano receptors [muscle spindle-golgi tendon-vascular baroreceptor]
- rapid[phasic] crude touch of capsulated receptors
- moderately like pressure and temperature
