Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/30

Click to flip

30 Cards in this Set

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