Overview of somatic motor/sensory pathways Flashcards
What are the two types of neurons associated with the somatic motor pathway?
Upper and Lower motor neurons
T/F: Lower motor neurons descend through the corona radiata, internal capsule, crus cerebri, most cross in pyramids, and descend in lateral corticospinal tract.
F; that is the route of Upper Motor Neurons (Coronas In Cabo Make People Drink Less Coor’s)
After descending in lateral corticospinal tract, upper motor neurons synapse in which part of the gray matter?
anterior horn (primarily rexed laminaVII)
Where are pyramidal upper motor neurons found?
cortex (BA 4)
Where are extrapyramidal upper motor neurons found?
brainstem
What descending tracts are associated with pyramidal neurons?
Anterior and Lateral Corticospinal tracts
What descending tracts are associated with extrapyramidal neurons?
tectospinal, rubrospinal, and vestibulospinal ( The Red Vans are Extra)
How do lower motor neurons exit the cord to supply somatic (skeletal) muscles?
via anterior (ventral) rootlets and carried in named nerves
T/F: Lower Motor neurons are found in the lateral horn of gray matter.
False; anterior horn
Which Rexed lamina are associated with Lower Motor Neurons
8 and 9
What kind of pathway is used for somatic sensory input from the trunk and extremities?
three neuron pathway from receptor to cortex
Where are primary (first order) sensory cell bodies located?
DRG
What is the route of primary sensory neurons?
receptor-> DRG -> either anterior or posterior spinal cord (MO)
Where do fibers of primary sensory neurons carried in the posterior spinal cord synapse?
MO
What order sensory neurons decussate and convey info to the thalamus?
secondary sensory neurons
