Cerebellum Flashcards
How cerebral cortex is linked to the cerebellum ?
Via the pontine nuclei.
Which part of the cerebral cortex project to the CB ?
Every lobe except the occipital one.
Name the subdivisions that compose the CB.
Lobe - Lobules - Folia
Which are the two main part of the CB ?
The cerebellar cortex and the cerebellar nucleus.
Name the nuclei of the CB.
Dentate
Globulose
Emboliform
Fastigial
Which distinctions can we make to subdivise the CB ?
Longitudinal:
Vermis
Intermediate hemisphere
Lateral hemisphere
Transversal:
Anterior lobe
posterior lobe
flocculonodular lobe
Functionnal :
vestibulo-cerebellum
spino-cerebellum
cerebro-cerebellum
Name and describe the layers of the cerebellum
Molecular layer: few cell bodies (mainly for interaction between dendrites and axons)
Purkinje cell layer*
Granule cell layer (small cells)
Describe purkinje cells in the CB :
purkinje cell layer Big neurons large 2D dendritic arbor descending axon to deep nuclei GABAergic (inhibitory) Main output of the cerebellar cortex not numerous but voluminous
Describe purkinje cells in the CB :
Granule cell layer (small cells) small cell body shord dendrites at the lvl of punkinje axon ascend vertically from the molecular layer glutamatergic (excitatory) interneurones synapse on Purkinje numerous main input of the CB
They form parallel fibers.
Which adjective can we use to describe the organisation between granule cells and purkinje cells ?
They have an orthogonal organisation
Describe golgi cells in the CB :
axon and body in granule layer
medium sized
dendrites in the molecular and the granule layer.
It’s an inhibitory neuron, the granule cells excite the Golgi cells which will in return, inhibited the granule cells.
Describe the basket
Inhibitory
medium sized
interneurons
located between granule and purkinje layers
Dendrites in the molecular layer
receive excitatory input from the granule cells
they synapse onto the Purkinje cells.
Their axons will follow a row of Purkinje cells and form like a basket around the Purkinje cells body.
THEY STRONGLY INHIBIT PURKINJE CELLS ON THEIR CELL BODY
can inhibit multiple purkinje c
Name the different type of neurons you can fin in the CB
Basket and stellate cells
punkinje
golgi
granular
Is there a difference if the input came from cell body membrane or from the dendrites ?
The signal is not the same. Delay is shorter.
Describe the stellate cells inside the CB.
Star shape
inhibit purkinje cells at the level of their dendrites
can inhibit 3-5 purkinje cells