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9 Cards in this Set
- Front
- Back
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What is sensory adaptation/accommodation? |
Some sensations have the quality of adaptation- decreased sensitivity to a continued stimulus. "Ignoring". After exposure to a certain stimulus strength for a time, the response of the receptors or the sensory pathways lessens from when the stimulus was first applied. The local graded depolarization that produces a receptor potential adapts/returns to its resting level, even though stimulus is still applied. Involves proprioception/tonic/phase receptors. |
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What are the 2 main pathways/tracts of the spinal cord? |
Ascending pathways - sensory Descending pathways - motor |
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What are the 3 systems of the ascending (sensory) pathways? |
1. Anterolateral system 2. Dorsal-column/medial-lemniscal system 3. Spinocerebellar tract |
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What are the 3 pathways/tracts in the anterolateral system and what is the sensation/action of each? |
1. Spinothalamic tract- pain, temperature, light touch, pressure, tickle & itch. 2. Spinoreticular tract- pain 3. Spinomesencephalic tract- pain & touch |
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What are the 2 pathways/tracts in the Dorsal-column/medial-lemniscal system and what is the sensation/action of each? |
1. Fasciculus gracilis- proprioception, two point discrimination, pressure & vibration from inferior half of the body. 2. Faciculus cuneatus- proprioception, two point discrimination, pressure & vibration from superior half of the body. |
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What are the 2 pathways/tracts in the spinocerebellar tract and what is the sensation/action of each? |
1. Posterior- proprioception 2. Anterior- proprioception |
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What are the 2 main pathways of the descending (motor) pathways? |
1. Direct (concious, skilled movements) 2. Indirect (unconscious movements) |
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What are the 2 main pathways/tracts in the DIRECT (concious, skilled movements) descending pathway and what is the sensation/action of each? |
1. Corticospinal tract: movements below the head, especially of the hands. .... 1a. Lateral: movements of the neck, trunk, upper & lower limbs, especially the fingers. .... 1b. Anterior: movements of the neck & trunk. 2. Corticobulbar tract: movements of the head & face.
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What are the 4 main pathways/tracts in the INDIRECT (unconcious movements) descending pathway and what is the sensation/action of each? |
1. Rubrospinal: movement coordination 2. Vestibubulospinal: maintenance of upright posture & balance 3. Reticulospinal: posture adjustment & walking 4. Tectospinal: movements of the head & neck in response to visual & auditory reflexes |
