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Neuro 8

WVSOM -- Neuroanatomy -- Somatosensory Pathways Test 1

What are the somatosensory pathways concerned with? conveying information regarding specific sensory modalities to the cerebral cortex for conscious perception
What are the 2 ascending spinal pathways? dorsol column/medial lemniscus pathway and anterior lateral system
What is the dorsal colum/medial lemniscus also called? dorsal column pathway and dorsal column system as well as DCML
What is the DCML involved with? carries information concerned with fine touch, proprioception and vibration
What sensory receptors are involved with the DCML? pacinian corpuscles, joint receptors, ruffini corpuscles, meissner’s corpuscles, GTO and muscle spindles
How do axons enter the spinal cord into the DCML pathway? central processes of DRG enter the spinal cord in the posterior horn and enter posterior funiculus.
How does the pathway change depending on location of entry into the spinal cord? axons form higher levels of the cord enter the posterior funiculus but assume a more lateral position. This works out as cervical are most lateral and sacral are most medial
What is the fasciculus gracilis? present at all levels. Contains long ascending branches of fibers from sacral, lumber and lower 6 thoracic roots
What is the fasciculus curneatus? appears around T7. Contains long ascending branches from the upper 6 thoracic and all cervical dorsal roots
Where are the 1st order neurons in the DCML pathway? neurons in DRG which send central processes ascending in fasciculus gracilis and cuneatus
Describe the route in which the first order neurons of the DCML ascend in? ascend ipsilaterally and terminate on the nuclei in the medulla.
What arises form the nucleus gracilis and cuneatus in the medulla? 2nd order neurons which project ventromedially as internal arcuate fibers
How do internal arcuate fibers travel? they decussate and form a compact fiber buncle on each side of the brain stem called the medial lemniscus
What is the medial lemniscus? compact fiber bundle on each side of brain stem made form internal arcuate fibers
Describe the location of the medial lemniscus. ascends throu the contralateral half of the brain stem and its fibers terminate in the VPL of the thalamus
Where are the 3rd order neurons of the DCML? travel from VPL of thalamus to the postcenteral gyrus of cerebral cortex (somatosensory cortex)
Where is the somatosensory cortex? postcentral gyrus
How many neurons in the Anterior Lateral system? 3
Where are first order neurons in ALS? DRG
Where are second order neurons in ALS? dorsal horn to VPL
Where are third order neurons in ALS? VPL to somatosensory cortex
What does the ALS do? conduct pain, temperature and crude touch info
Describe the role of first order neurons in ALS. receives input from seonsory receptors and projects to the dorsal horn where the neurons split. They then travel 1 to 3 segments upa dn down the cord in the dorsolateral tract and enter the dorsal horn where they synapse
Describe the path of the second order neurons in the ALS pathway. from the dorsal horn they immediately cross the cord in the ventral white commissure. They then ascend the spinal cord in the ALS and synapse in the VPL.
Where do 3rd order neurons travel in ALS pathway? from the VPL to the somatosensory cortex
Created by: Todd Jamrose Todd Jamrose