is the overlap of dermatones more extensive for touch or pain/temp - Answer✔✔-
more overlap in touch
gracile tract - Answer✔✔-for DCML, bundle of fibers from lower limbs that travel most
medial
cuneate tract - Answer✔✔-for DCML, bundle of fibers from upper limbs/neck/trunk
that lie more lateral
post-synaptic dorsal column projection - Answer✔✔-projection neurons in dorsal horn
laminae III, IV, and V receive mechanosensory input and project parallel through dorsal
column to dcn
DCML - Answer✔✔-1) mechanosensory receptors send info to fibers in gracile &
cuneate pathways
2) fibers travel to caudal medulla, synapse at dorsal column nucleus (and switch sides)
3) exit DCN as arcuate fibers, cross the midline to form medial lemniscus carries
through pons, midbrain, brainstem
4) synapse at thalamus (VPL)
5) internal capsule takes axons to post-central gyrus/S1, some to S2.
decussation of the medial lemniscus - Answer✔✔-crossing of internal arcuate fibers
VPL of thalamus - Answer✔✔-receives information from medial lemniscus that
carreis info from body and posterior head (more laterally located)
2/9
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