Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

50 Cards in this Set

  • Front
  • Back
Motor System consists of
1. cerebral cotex involvement
2. basal ganglia
3. cerebellum
Cerebellar Damage symptoms
1. ataxia-incoordination
2. loss of fine motor control
3. problems w/ motor programs
4. balance
how many homunculi are on surface of cerebellar cortex?
chiari malformation

cerebellar peduncles
cerebellar tonsils herniate into the foramen magnum

hold up cerebellum and connect it to the brainstem


brachium conjunctivum

bracium pontis- most lateral, largest. Pontine nuclei, fasicles
restiform body- ventral, associated w/ medulla
Primary Fissure

Posterolateral FIssure
divides ant lobe from post lobe

divides post lobe from flocculonodular lobe
nodule is part of what lobe?
flocculonodular lobe
oldest part of cerebellum
flocculonodular lobe, lingula, flocculi

vermis, paravermian cortex

majority of cerebellar hemispheres, and middle vermis
The Trunk


Vestibular fxns, eye mvmt
midline, veris and paravermis- paleocerebllum
more lateral, neocerebellum

deep cerebellar nuclei

outputs from fxnal areas of cerebellum have to synpase here before exiting

dentate, emboliform, globose, fastigal
Dentate Nuclues

Interposed Nuclei

Fastigal Nucleus
largest, most lateral, neocerbellum
Emboliform, Globose

midline, Archicerebellum
some exciting fibers of the Flocculonodular lobe skip the fastigal nucleus and synapse where?
Vestibular Nuclei
Mollaret's Triangle
Red Nuc, Central Tegmental Tract, Dentate Nuc

palatal myoclonus w/ damage
3 Major Layers of Cerebellum
1. Molecular- outermost, few cells
2. Purkinje Cell Layer- major output, huge cells
3. Granular layer- very cellular, sinks during dvlpt
*Has golgi cells
Ramon y Cajall, Camillo Golgi
developed staining technique w/ salts of silver and gold

saw dedrites of Purkinje cells
2 input fibers of Cerebellum
1. Mossy Fibers
2. Climbing Fibers- orig in ION of opposite side. climb dendritic tree of purkinje cells
both excitatory
Granular Layer
Purkinje Layer
Molecular Layer interneurons
granular cells + Golgi cells.
dendrites project into molec.
1. Stellate Cells- contact dendrites of purkinje cell *GABA
2. Basket Cells- contact cell body of purkinje cell *GABA
all cells in cerebellum are inhib/GABA except?
Granular Cells- Glutamenergic
Basket Cell
Stellate Cell
of Molecular Layer
are both GABA
Mossy Fibers terminal

(mossy/climbing fibers are excitatory input)
Glomerulus- Golge Cells and Granular cells synapse here
after the Mossy Fiber Glomerulus terminal
Granular Fibers have
parallel fibers that are parallel w/ surface of folia
*Connections w/ everyone
Golgi/Granular Cell loop
granular cell excites golgi cell which inhibits granular cell
Climbing Fiber
climbs on tree of Purkinje Cell
Molecular layer
Stellate Cells
Basket Cells
stellate cells go after branches
basket go after the trunk of the purkinje cell
*BOTH are inhibitory
Purkinje cells do what to deep cerebellar nuclei
inhibit them

all others will excite deep cerebellar nuclei
BALANCE b/w excitation/inhibition
Mossy Fibers and Climbing Fibers

Granular fibers excite whom?
stimulate Deep Cerebellar Nuclei

most impt monoamine in cerebellum

cerebellum is closer to LC than SN
what is the main input in the cerebellum?

where does it come from?
peripheral nerves- helps coordinate and does proprioceptive info

1. muscle spindles 2. golgi tendon organs
4 Spinocerebellar Pathways

from periphery-SC-to Cerebellum
1. Cuneo SCT- arms
2. Rostral SCT- arms
3. Dorsal SCT- legs
4. Ventral SCT- legs
Dorsal SCT
ext Cuneate Nuc-> ICP-> Arms
ICP+SCP-> Arms
Clarks Colum-> ICP-> Legs
SCP-> Legs
SCT that go through the ICP
have nuclei
1. Cuneo SCT
2. Dorsal SCT
SCT that go through the SCP
do not have nuclei
1. Rostral SCT
2. Ventral SCT
Dorsal and Ventral SCT are found in which part of the SC?
lateral most part of Lateral Funiculus. unconscious proprioception

dorsal- assoc w/ clark's column in thoracic cord. medial to IMLCC
external cuneate nucleus is what? where?
the cuneo SCT relay point

in rostral Medulla
ICP inputs:

1. Spinocerebellar paths
2. Contralateral ION

archicerebellar-> Vestibular Nuclei
MCP inputs:
mostly pontine nuclei from cerebral cortex
Major output pathways to contralateral (b/c of decussation) VA/VL of thalmus

rostral and ventral SCT use it to get in
outflow of SCP is primarily from what nuclei?
1. Interposed Nucleus
2. Dentate Nucleus(mostly)
Major output of Flocculonodular Lobes is to what?
Vestibular control of eye movements

Vestibular-Occular Reflex (DOll's Eye)

Archicerebellum assoc w/ this
main fxn
going to Vestibular Nuclei
some form Vestibulospinal Tract to axial musculature
Fastigal Nuc is main output
Balance, Posture, Eye fixation
majority deals with Trunk (on cerebellar homunculus)
1. proprioceptive adjustments
2. position
3. velocity
Paleocerebellum primarily goes to what nuc

what outputs
Interposed Nuclei-->Sup Cerebellar Peduncle then to 3outputs
1. Rednuc and RubroST
2. Motor Cortex (double cross)
3. Vestibulospinal tract
1. motor precision
2. motor execution

lesion here->ataxia
major output of Neocerebellum is to what nuc?
Dentate Nucleus-> SCP->
1. Red Nucleus
2. most to motor cortex loop

problem in hands, undershoot/overshoot. cerebrocerebellum
rapid alt movements
Positive Romberg's Sign
if trunk of cerebellum is involved. pt closes eyes and cant stand up

Neurosyphillis- bact destrol Dorsal columns
The Double Cross
necessary b/c there is no 'cerebellospinal' tract
cerebellum influences CST
cross #1
1. while CST is in pons, corticopontine fibers synapse on pontine nuc and cross thru pontine fassicles to MCP and into neocerebellum via Mossy Fibers
corss #2
1. cerebellum sends these fibers back up north thru SCP
2. SCP decussates, synapse in VA/VL
3. enters motor cortex