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30 Cards in this Set
- Front
- Back
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basic pathway of dorsal column system
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stimulation- sensory receptors- spinal cord- brainstem/medulla- thalamus- cortex
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2 Major Sensory Columns:
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Dorsal Columns and Anterolateral Tracts
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what info do dorsal columns carry to the brain?
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tactile, vibration, joint position
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what info to anterolateral tracts carry to the brain?
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pain and temperature sensory information
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What are Rexed Laminae?
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General regions that the gray matter is divided into
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the most superficial Rexed Laminae? What do they recieve?
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Laminae I and II...nociceptive primary afferent input from dorsal roots
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what information do Laminae II and IV recieve?
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tactile/vibration information from the dorsal roots
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which part of the spinal cord has largest amount of white matter?
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cervical
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which part of the spinal cord has the largest ventral horn?
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lumbar
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where does the affernt info come inro the dorsal column system?
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all of mechanoreceptors from lecture I (Merkel, etc)....AB fibers
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what part of the dorsal root do the central processes of afferents enter the spinal cord?
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through the medial part of the dorsal root
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how do most axons of mechanoreceptors ascend?
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ipsilateral (same side)
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where do a few branches of mechanoreceptors syname?
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dorsal horn....sends axons ACROSS the spinal cord that ascend in the CONTRALSTERAL ANTEROLATERAL TRACT..
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Fasciculus Gracilis carries information about...
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T7 and below
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Fasciculus Cuneatus carries information about...
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T6 and above
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where does Faciculus Cuneatus begin?...which parts of spinal cord
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T6...part of thoracic and all of cervical
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somatotopy in dorsal columns:
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leg= most medial
neck=most lateral |
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how are sensory fibers added as the columns ascend?
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laterally
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lesion in dorsal columns
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loss of sensory info at that level and below ON SAME SIDE
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lesion at the Medial Lamniscus of the Caudal Medulla
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loss of sensory deficit on CONTRALATERAL side
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where do the 2nd order neurons from the Medial Lemniscus terminate?
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Ventral Posterior Lateral (VPL) nucleus of the thalamus
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VPL recieves information about?
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neck and body
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VPM recieves information about?
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face and head
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somatotopy in the thalamus?
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neck=medial
feet=lateral |
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fibers from what area of the body terminate most laterally in the VPL?
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leg
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lesion in the VPL?
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contralateral DEFECIT
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where do the axons from the VPL ascend?
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the POSTERIOR LIMB of the INTERNAL CAPSULE and fans out as the CORONA RADIATA
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where do thalamic neurons terminate?
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Somatosensory Cortex (S1) of the Postcentral Gyrus
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somatotopy in the cortex ?
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leg=medial
neck=lateral |
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what 4 areas does S1 contain?
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Brodman's areas area3B, Area 1, Area 3A, Area 2
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