Nervous System III Senses

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Nervous System IIISenses

• Al Mina, M.D.
• Erskine College

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Modified from

• Powerpoint Presentation for BG210 made by
• Dr. Nora Espinoza, Ph. D.
• Which was

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Modified from a PowerPoint Presentation made
to accompanyHoles Human Anatomy and
Physiology, 11/e byShier,
Butler, and LewisMcGraw-Hill - publisher
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Figure 10.3
Neuron
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Neuron ClassificationFunctional
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Sensory Receptor Type

• 5 types of receptors
• Chemoreceptors
• Nociceptors (pain receptors)
• Thermoreceptors
• Mechanoreceptors
• Photoreceptors

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Somatic Senses

• 3 types
• exteroceptive senses
• proprioceptive
• visceroceptive (interoceptive)

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Touch and Pressure

• Mechanoreceptors
• sense of mechanical forces
• Sense deformation or displacement in tissues
• 3 types
• free nerve endings
• Meissners corpuscles (tactile corpuscle)
• Pacinian corpuscles (lamellated corpuscle)

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Touch and Pressure Senses
Figure 12.1
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Human skin tactile corpuscle
Meisseners corpuscle
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Lamellated corpuscle
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Lamellar corpuscle - from mesentery
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Temperature

• Warm receptors 25-45C (77-113F)
• Cold receptors 10-20C (50-68F)
• Can adapt to reduce stimulus

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Figure11.12
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Figure 11.26
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Stretch Receptors
Figure 12.5
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Stretch Receptors
Figure 12.5