3. CEREBELLUM
⢠Hind brain-
â small brain
⢠Posterior cranial fosse
⢠Forms roof of IV ventricle
⢠Fissures and folia
4. CEREBELLUM
⢠Receives sensory data
â Same side spinal cord
â Dorsal and ventral
spinocerebellar tract
⢠Receives Motor data
â from cerebrum opposite
side
â Cortico pontine fibers
⢠Output is motor in function
5. CEREBELLUM
⢠Cerebellum
âcontrols the activity of cerebrum and
spinal cord
âdysfunctions
⢠manifested by disturbances in the motor
functions without voluntary paralysis
⢠Resulted in clumsy, poorly coordinated
loss of skillful movements
7. White fibers - afferent
⢠Mossy fibers
â Spinal cord
â Vestibular nucleus
â Pons
⢠Enters through inferior and middle cerebellar
peduncle
⢠Synopses with Purkinje cells through granular
cells
8. White fibers- afferent
⢠Climbing fibers
â Olivary nucleus
â Accessory olivary nucleus
⢠Through inferior peduncle
⢠Enters directly to molecular layer
⢠Synapses with Purkinje 1:1
9. White fibers - efferent
⢠Axons of Purkinje
( except archicerebellum)
⢠Deep nuclei of
cerebellum
⢠Through superior
cerebellar peduncle
10. Cerebellum-cortex
⢠Pia mater
⢠Cortex and white fibers
⢠Cortex-Three layers
⢠Type of cells
â Stellate cells
â Basket cells
â Purkinje cells
â Granule cells
â Golgi type II
⢠White fibers
â Climbing fibers
â Mossy fibers
11. CEREBELLUM⢠Layers of cerebellum
⢠Molecular layer
â Dendrite orborization
â Densely packed axons run
parallel to surface
â Superficially stellate cells
â Deeper stellate cells
known as basket cells
⢠Purkinje layer
⢠Granular layer
â Closely packed granule
cells
â Shows clear zones -
glomeruli
22. Cerebral cortex- type of neurons
⢠Six type of neurons
⢠Pyramidal
â Triangular
â Dendrite arises from three
angles
â Axon from the base of cell
â Prominent nucleus and Nissl
substances
â Small sized pyramidal
neuron10-12 micron
â Medium sized neuron 40-50
micron
â Large sized (Betz cells ) > 100
micron
23. ⢠Stellate/granular cells
â Polygonal/triangular
shape
â Dark condensed nucleus
â Dendrites arises all over
â Axon terminate next
layer and goes deeper
⢠Fusiform cells
â Oriented perpendicular
to the surface
â One dendrites towards
superficially
â One axon towards
deeper layer
STELLATE
F
U
S
I
F
O
R
M
24. ⢠Horizontal cells of Cajal
â Spindle shaped
â Parallel to the surface
â Internuncial type
⢠Cell of Mortinotti
â Small triangular cells
â Axons goes towards
surface
⢠Golgi type II
â Process ends close to
cell body
â Local circuit
CAJAL
MORTINOTTI
GOLGI
25. Layers of cerebral cortex
⢠Outer Molecular layer
â Horizontal cells + Golgi type II
â Tangential nerve fibers from
pyramidal, fusiform and cells of
Mortinotti
⢠Outer granular layer
â Small pyramidal cells + stellate
cells
â Dendrites end in first layer
â Axons forms association
⢠Outer pyramidal layer
â Medium and large pyramidal cells
â Axons forms association and
commissural fibers
OM
OP
OG
26. ⢠Inner granular layer
â Packed stellate cells
â Lot of fibers as band-
Outer band of Baillarger
⢠Inner pyramidal/ganglion
â Large Betz cells
â Axons continues as
projection fibers
â Horizontal fibers forms
inner band of Baillarger
⢠Multiform layer/fusiform
cells
â Spindle shaped cells
â Granular, fusiform and
stellate type
Outer band
Inner band