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1 nervous system (central nervous system CNS (brain (hind brain …
1
nervous system
central nervous system
CNS
occupies the central part
of the body
spinal cord
brain
weighs about 1.5kg in adults
comprises all the structures
which are intercranial
(located within a hard bony skull )
fore brain
prosenchephalon
telencephalon
2 cerebral hemispheres
& their connections
Hemispheres connected to each other
by bundles of nerve fibers
the
commissures
The largest commissures is
the corpus callosum
Cortex of each hemisphere
is divided into
Parietal
Occipital
Frontal
Temporal
Cortex is
an area of grey matter
about 3 mm thick
highly folded(incr S.A available for
cortical neurons without incr in the vol of brain)
Deep within the hemisphere
other areas are formed by
The sub cortical nuclei
Most predominant among them is
The basal ganglia
outer structures
diencephalon
thalamus
(a large cluster of nuclei
that serves as a
synaptic relay station)
upper 2/3rd
hypothalamu
s
(connects with the
pitiutary complex)
lower 1/3rd
deep structures
hind brain
rhombencephalon
Medulla oblangata
Cerebellum
Pons
mid brain
mesencephalon
dorsal part
tectum
Constitutes of 2 elevations
Superior colliculi
inferior colliculi
ventral part
cerebral peduncle
is mainly of white matter
unites the pons
with the thalamic region
of cerebrum
Comprises of
substantia nigra
tegmentum
basis peduncle
This part is divided into 2 parts
by the
Aqueduct of sylvius
( ducts which connect the
3rd & 4th ventricles)
also contain 4 interconnected
cavities - the cerebral ventricles
that contain cerebrospinal fluid (CSF)
limbic system
area of
peripheral nervous system
PNS
Autonomic NS
Enteric NS
Somatic NS
the basic structural & functional
unit of nervous system is
the individual nerve cell
the
neuron