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3 Layers of Cerebellum:
1
...
Purkinje Fibers
3
...
Temporal Lobe
2
...
Parietal Lobe
4
...
form & sizes
• in cross section of spinal cord- GM seen in the centre
(form H-shape)
• in [horizontal bar of H-shape]- is the central canal (remnant of
the lumen of the embryonic neural tube)
•Central canal- lined w ependymal cells

•main component - myelinated
axons & oligodendrocytes
• NO neural cell bodies
• in [cerebral & cerebellar cortex] MORE WHITE MATTER in the
central
•in {spinal cord], white matter
located in the peripheral
(surrounds the

NERVES
TISSUE

37

• Usually short & branches out
• receives many synapses - main reception
& processing site of neutron
• most nerve cell have several dendrites increases receptive area of neuron
• its size not maintain (unlike axons)thinner when branches out

Dendrites

•leg of grey matter H-shape formation is called anterior
horns (contain motor neuron)
•Posterior arm of H-shape (posterior
horns)- receives sensory fibre from
neutrons in spinal ganglia
(PNS)

Epimeuron - whole nerve bundle
Perineuron - smaller bundles of nerve
fibres
Endoneuron - individual axons

Additional

White matter

Nucleus
Neurofilament
Perikaryon
[N2
...
g motor neurones

NEURONS

Oligodendrocytes & Schwann Cells

• low columnar
epithelial cells lining
ventricles of the brain
& central canal of
spinal cord
• some location,
ciliated - facilitate
movement
of
cerebrospinal fluid

Lipofuscin

Mitochondria

• both produce myelin but in diff
...

•
• Anterogade flow has 3 speeds:
• slow - transports protein & actin filaments
• intermediate - transport mitochondria
• fast - transport neurotransmitters needed during synaptic communication
• RETROGRADE FLOW - transport material taken up by endocytosis during
synaptic transmission

Pseudounipolar
•1 process close to cell body

Function

Motor Neurons
•
•
•
•

Efferent
Control effector organ
Carry impulse away from CNS
Carry impulses to effectors

Sensory Neurons
• Afferent
• Carry impulse to CNS from
environment or within body

Interneurons
• link neurons to each other

Synaptic Communication

•contain neural bodies, dendrites &
initial unmyelinated portion of axon & glial
cells [located on the surface of cerebral &
cerebellar cortex]

3 Layer of CT surround NT



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