Sensory Receptors

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Sensory Receptors:

Sensory Receptors Prof. Husan Bano Department of Physiology Al- Tibri Medical College, Isra University

Sensory Receptors:

2 Sensory Receptors Sensory receptors are specialized structures which are stimulated by changes in their environment. Such environmental changes are called stimuli

Sensory Receptors :

Sensory Receptors When sensory receptor stimulated by an adequate stimulus , it produces depolarization or graded potentials. This graded potential convert into nerve action potential which travel along the afferent fibers and gives impulses to CNS.

Sensory Receptors Classification :

Sensory Receptors Classification Structure Location Type of stimulus detected

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1. Classification of Sensory receptors by Structure

1. Classification of Sensory receptors by Structure:

1. Classification of Sensory receptors by Structure Somatic or general senses Touch Temperature Vibration Nociceptors Itch Proprioceptors Special senses Vision Hearing Taste Smell Equilibrium

Classification by Structure:

7 Classification by Structure General sensory receptors Widely distributed Nerve endings of sensory neurons monitor : Touch, pressure, vibration, stretch Pain, temperature, proprioception Divided into two groups Free nerve endings Encapsulated nerve endings

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Sensory Receptors

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2. Classification by Location

2. Classification by Location:

11 2. Classification by Location Proprioceptors : monitor the degree of stretch Interoceptors : ( visceroceptors ) : receive stimuli from internal viscera Monitor a variety of stimuli. Exteroceptors : sensitive to stimuli arising from outside the body Located at or near body surfaces Include receptors for touch, pressure, pain, and temperature .

Proprioceptors:

Proprioceptors Muscle spindle Golgi tendon organ Joint receptor

Structure of Proprioceptors:

14 Structure of Proprioceptors

Classification by Location :

15 Classification by Location 2. Interoceptors Detect stimuli from inside the body These receptors respond to pH, oxygen level in arterial blood, carbon dioxide concentration, osmolality of body fluids, distention and spasm (e.g., gut), and flow (e.g., urethra)

Classification by Location :

16 Classification by Location 3. Exteroceptors Sensitive to stimuli arising from outside of the body Typically located near the surface of the body Include receptors for Touch Pressure vibration Pain Temperature Special sense receptors

3. Classification by Stimulus Detected:

3. Classification by Stimulus Detected

3- Classification by Stimulus Detected:

3- Classification by Stimulus Detected Mechanoreceptors : respond to mechanical forces Thermoreceptors : respond to temperature changes Chemoreceptors : respond to chemicals in solution Photoreceptors : respond to light – located in the eye Nociceptors : respond to harmful stimuli that result in pain

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