Mechanosensory Pathways
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| Distinguish between the dorsal column-medial lemniscus (DC-ML) system and the trigeminal mechanosensory system in terms of the regions of the body from which they receive sensory information. | DC-ML: all tactile and proprioceptive info from body except anterior two thirds of face<br>Trigeminal: tactile and proprioception from anterior two thirds of face
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| Name the sensory receptors that convey information through the DC-ML and trigeminal pathways. | - Merkel cell: slow adapt mechanoreceptors<br>
- Meissner: rapid adapt MR<br>
- Pacinian: rapid<br>
- Ruffini: rapid<br>
- Crude touch-free nerve endings<br>
-Muscle spindle:rapid and slow adapting<br>
-Golgi tendon organs: slow<br>
-Joint Rcpt:slo
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| List the types of sensory information mediated by DC-ML and trigeminal pathways. | Fine touch (Merkel cells, Meissner, Pacinian, Ruffian)<br>
Crude touch (free nerve endings)<br>
Proprioception (muscle spindles, Golgi tendon organs, joint receptors)
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| Explain why crude touch does not localize to a specific sensory pathway | Free nerve endings are mechanicallly sensitive but lack precise localization
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| Name the thalamic nuclei to which the DC-ML system projects. Name the thalamic nuclei to which the trigeminal mechanosensory system projects. | DC-ML: ventral posterior lateral<br>Trigeminal: ventral posterior medial
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| List the locations of the first, second and third order neurons in the DC-ML system and in the trigeminal mechanosensory system. Identify sites of decussation in both pathways. | DC-ML<br>1 order:peripheral axons in spinal nerves, soma in dorsal root ganglia<br>2 order:soma in gracile and cuneate nuclei, axons decussate at spinal cord midline (internal arcuate tract)
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Created by:
pndinh@wm.edu
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