2. Definition
It is a specialized/modified sensory nerve
epithelial ending which undergoes depolarisation
in response to a specific stimulus.
It acts as a ‘biological transducer’.
3. Classification
I. Based on type of stimulus
II. Based on anatomical location
III. Based on location of stimulus
IV. Based on rapidity of adaptation
4. I. Based on type of stimulus
Mechanoreceptors
Chemoreceptors
Thermoreceptors
Nociceptors
Photoreceptors
5. II. Based on anatomical location
Special Senses
Superficial Senses/Cutaneous Senses
Deep Senses
Visceral Senses
6. III. Based on location of stimulus
Telereceptors
Exteroceptors
Interoceptors
7. IV. Based on rapidity of adaptation
Tonic Receptors
Phasic Receptors
18. Coding of Sensory Information
Muller’s Doctrine of Specific Nerve
Energies
Law of Projection
Law of Intensity Discrimination
19. Muller’s Doctrine of
Specific Nerve Energies
When the nerve pathways from a particular
sense organ are stimulated, the sensation produced
is that for which the receptor is specialized no matter
how or where along the pathway the activity is
originated.
Stimulation of the receptors or the sensory
pathway anywhere along its course will produce same
sensation as normally perceived by stimulation of the
receptor.
20. Law of Projection
No matter where a particular sensory
pathway is stimulated along its course to the
cortex, the conscious sensation produced is
referred to the location of the receptor. This
principle is called the ‘law of projection’.
Phantom Limb