Descending tract Flashcards
Name 1 descending tracts?
Corticospinal
What is function pyramidal tracts (corticospinal)
Originate cerebral cortex
Carry motor fibres to spinal cord and brainstem
Responsible luluntary muscle control
What is function of corticospinal tract?
Voluntary muscle control
What is function extrapyramidal tracts?
Originate brain stem
Carry motor fibres to spinal cord
Responsible for involuntary and autonomic control of musculature
What tract is responsible for voluntary muscle control?
Corticospinal tract
Where does corticospinal tract begin?
Cerebral cortex
What inputs into corticospinal tract?
Primary motor cortex
Premotor cortex
Supplementary cortex
What is pathway of corticospinal tract?
Cortex
Descends through internal capsule
Crus cerebri
Pons
Medulla
Tract divide 2- lateral and anterior
What does corticospinal tract divide into?
Lateral (majority)
Anterior
What is pathway lateral corticospinal tract?
Majority decussate at medulla
Descends
Terminate ventral horn
What is pathway anterior corticospinal tract?
Some Ipsilateral
Decussates and terminates in ventral horn of upper thorcac lvl
Where do majority of fibres in corticospinal tract decussate?
Medulla
Where do extrapyrimidal tract originate? eg
Brainstem
Vestibulospinal
Rubrospinal
Function corticospinal?
Anterior- trunk and axial
Lateral- limbs
L is L
How many neurones in descending?
2
UMN
LMN
