Sensory Physiology

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Sensory Physiology
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Sensation

• State of external/internal awareness
• Stimulus
• Receptor
• Nerve impulse to brain

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Characteristics of Sensations

• Projection
• Phantom Pain
• Adaptation
• Afterimages
• Modality

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Receptors

• Dendrites
• Generator potential

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Receptors according to stimulus location

• Exteroceptors
• Enteroceptors Visceroceptors
• Proprioceptors

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Receptors according to Type of Stimulus

• Mechanoreceptors
• Thermoreceptors
• Chemoreceptors
• Photoreceptors
• Nociceptors (pain)

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Cutaneous Sensations

• Receptor Fields
• Two point discrimination/threshold
• Lateral inhibition

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Cutaneous Sensations

• Tactile sensations
• Meissners corpuscles Touch corpuscles
• Hair root plexus
• Free nerve endings

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Cutaneous Sensations

• Pressure sensations
• Pacinian corpuscles
• Thermal sensations
• Free nerve endings
• Pain sensation
• Free nerve endings
• Referred pain

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Proprioceptive Sensations Kinesthetic Sense

• Muscle spindles Intrafusal fiber
• Stretch receptors
• Tendon organs Golgi tendon organs
• Contraction receptors
• Misc. joint receptors

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SPECIAL SENSES
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Olfaction

• Receptors in upper nasal mucosa
• Olfactory nerve
• Olfactory bulb
• Olfactory tract
• Temporal lobe of cerebral cortex

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Gustation

• Taste buds are receptors
• Taste pore
• Liquid
• Taste zones

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Gustation

• Sensory nerve fibers
• Facial
• Glossopharyngeal
• Vagus
• Brain stem
• Thalamus
• Parietal lobe of cerebral cortex