Test 4 - Ch. 15 Flashcards
What are the jobs intended for the cerebellum?
Coordinate movement and postural control
Compare what you do to what you meant to do
Makes corrections if necessary
Which section of the cerebellum takes into account the intended movement?
photocerebellar - intended
location - straight back from cerebellum
Which section of the cerebellum takes into account what is actually occurring in movement?
spinocerebellar - actual
location - SC - cerebellum
Where does corrector information get sent if need be from the cerebellum?
from top of cerebellum to UMN of BS and cortex for postural and distal movements
UMN of BS and cortex that control gross postural movements and fine distal movements
What are four areas that the cerebellum gets input from to combine to make corrections?
SC - spinocerebellar - discriminative touch and nonconformist prop (what I am doing)
Reticular formation - arousal (level of urgency)
Vestibular system
Pontine nuclei - xerox copy from cerebral cortex to pons into cerebellar (what I meant to do)
What is the pathway of the output for cerebellar
purkinje to
base of cerebellum to
deep cerebellar nuclei (WM) to
UMN of BS and cortex (gross and fine motor)
Describe the divisions of the cerebellum?
midline vermis
paranormal
lateral
Midline vermis- midline anatomical piece- controls the midline of us (the axial skeleton)
Paravermal hemispheres- those are going to especially
control out most proximal joints (shoulders and hips)
Lateral hemispheres- those control our distal muscles.
What does the Flocculonodular lobe do?
helps us to maintain our equilibrium overall. (not a vertical division, it plays with vertical divisions)
What does the inferior peduncle of the cerebellum do?
the most inferior fiber bundle, the closest to the spinal cord, brings input from the spinal cord and the brainstem- brings the message of what I am really doing.
What does the middle peduncle of the cerebellum do?
big one- brings input from the pontine nuclei- the xerox copy- what I meant to do message
What does the superior peduncle of the cerebellum do?
fiber bundle- takes messages up to BS and cortex make corrections if necessary
What are the three functional divisions of cerebellum?
Vestibulocerebellum- Flocculonodular lobe - balance and equilibrium
Spinocerebellum - Vermis and paravermis - BS UMN core and prom
Cerebrocerebellum - Lateral hemispheres - corticospinal - fine movements distal
What does the vestibulocerebellum do?
represents inner ear. Has a real tight connection to the inner ear. (balance and equilibrium)
Input- from the inner ear (vestibular receptors)
Output- from the cerebellum through the vestibular nuclei to eye muscles and postural muscles a steady gaze is critical to equilibrium so that we stay balanced.
Function- equilibrium
What does the spinocerebellum do?
tight connection to the brainstem UMN) (core and proximal)
Input- spinocerebellar tracts (discriminative touch and nonconscious proprioception) and also from sensorimotor cortex (what I meant to do)
needs to know what we are really doing and what we meant to do (so we know if proximal muscles are doing what we want them to do)
Output- Medial division UMN
cerebral cortex- medial corticospinal neurons (voluntary control)
brainstem- medial and lateral vestibulospinal (medial-keeps head upright against pull of gravity, lateral-keep lower body upright against gravity) and reticulospinal
Function- control core and proximal movements.
What does the cerebrocerebellum too?
lateral corticospinal- strong connection between the cerebellar hemispheres (fine motor control)
Input- cerebral cortex (cerebropontocerebellar, from the head to the pons to the cerebellum-the xerox copy)- and sends planning messages back
Output- lateral division UMN
Cerebral cortex
Function- coordinate voluntary movement
- plan movements - timing
