week 6 quiz Flashcards
What are the components of the Lateral Corticospinal tract
Lateral
originates in Primary motor cortex
function: voluntary initiation of movement
What are the components of the Rubrospinal tract?
lateral
originates in red nucleus of midbrain
function: flexion of upper limbs
what are the components to the lateral reticulospinal tract?
lateral
function: automatic posture and gait related movements
what are the components of the anterior corticospinal tract?
medial
originates in primary motor cortex
function: control of bilateral axial and girdle muscles
what are the components to the vestibulospinal tract?
medial
originates in vestibular nuclei
function: head and neck position, balance
what are the components to the reticulospinal tract?
medial
originates in reticular formation
function: automatic posture and gait related movements
what are the components to the tectospinal tract?
medial
originates in superior colliculus
function: coordination of head and eye movement
what are alpha motor neurons?
extrafusal skeletal muscle
what are gamma motor neurons?
intrafusal fibers of muscle spindle
where are upper motor neurons located?
cell bodies are in the cortex/brainstem
white matter=descending tracts
functional organization of medial descending tracts
ventral corticospinal
medial reticulospinal
medial/lateral vestibulospinal
tectospinal
Axial, girdle musculature, regulate posture, bilaterally
What is the pyramidal system?
originates from cortex, descends through the pyramids. controls voluntary movement
Lateral corticospinal tract 90%
anterior corticospinal tract 10%
corticobulbar-voluntary head/neck
functional organization of lateral descending tracts
lateral corticospinal
rubrospinal
lateral reticulospinal
Controls limb musculature unilaterally
what is the extrapyramidal system?
originates from brainstem
reflexive and involuntary movement
medially descending tracts
rubrospinal tract
basal ganglia
