Lecture 11 Somatsens Slides F09

Lecture 11 Somatsens Slides F09 - Lecture 11 Somatosensory...

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Lecture 11 Somatosensory Perception
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Somatosensory Perception Exteroceptive: Skin sensations; including heat, cold, touch, pain, etc. Proprioceptive: Perception of body position and movements, including muscle length and tension, joint angle, and vestibular sensation. Interoceptive: Information about the internal, particularly chemical, condition of the body - temperature, blood pressure, salt levels, glucose levels, etc.
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Somatosensory Perception is mediated by sensory neurons that project from the skin to the spinal cord Dermatomes: the area of skin that projects to an individual spinal nerve
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Exteroceptive Perception: Receptive Field: The area of skin which stimulates a single somatosensory receptor; differs with type of sensation and part of body. Adaptation: Decreased response with repeated stimulation; some receptors adapt rapidly, some adapt very little. Qualitative response: There are several types of skin receptors that respond to heat, cold, pain and several types of mechanical sensations (e.g. touch, vibration, stretching of the skin, etc.).
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Anatomy of the Skin and its Receptive Organs Free Nerve Endings: Superficial, respond to temperature change and pain; separate cold and heat responses. Meissner’s corpuscles: Superficial, adapt rapidly, respond to pressure, low frequency vibrations. Merkel’s disk: Superficial, adapt slowly, respond to pressure and stretching of skin. Ruffini corpuscle:
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Lecture 11 Somatsens Slides F09 - Lecture 11 Somatosensory...

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