Receptors Reflex action, Lecture notes of Neurology

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Receptor PhysiologyReceptor Physiology

Dr. Touseef Sayyar

Reflex actionReflex action



“it is an automatic and

involuntary response

to a stimulus without

any conscious effort”



Reflex arc

“it is the neuronal

pathway involved in

accomplishing a reflex

activity”

Components of Reflex Arc

Classification ofClassification of

Receptors Receptors

Based on:



Location



Type of stimulus detected



Structure &



Adaptations

Receptors based onReceptors based on

type of stimuli /sensory type of stimuli /sensory

modalitites modalitites

 (^) Osmoreceptors  (^) Mechanoreceptors  Chemoreceptors  (^) Thermoreceptors  (^) Photoreceptors  (^) Nociceptors

Based on the structure

Based on the Adaptation

Rapidly adaptingRapidly adapting

Receptors Receptors



These receptors cannot transmit

a continuous signal because these

are stimulated only when the

stimulus strength changes



Examples :



Pacinian's corpuscles

Receptor PotentialReceptor Potential

 (^) Interaction of sensory receptors results in Graded Potential  (^) Graded Potential is called as Receptor or Generator Potential  Primary receptors  (^) Axons conduct action potentials in response to receptor potential  Secondary receptors  (^) Cause release of NT that bind to receptor on a neuron causing a receptor potential .Smell, taste, hearing balance