1. NERVOUS TISSUE
ARAGON, FELIZZ STEFANN
COSTUYA, DANNAH KATE
GEPILANO, ERIKA GABRIELLE
RAMA, JUSTINE MAE
BS MT 1C GROUP 8
“TO GOD BE THE GLORY
ALWAYS!”

3. This tissue arises
from the embryonic
ectodermal cells.

4. The essential
functions of the
nervous tissues
are:
-The reception
of environmental
stimuli, and

5. Transmission of
impulse to the
nerve centers,
resulting in an
appropriate
sensation or
response.

6. The nervous
tissue provides
the mechanism
for behavior and
integration of the
function of the
various organs of
the body.

7. This tissue receives
stimuli for the external
or internal
environment through
specialized cell
structure called
receptors which
transmit these nerve
impulses to the nerve
centers where they are
reorganized and
interpreted.

8. The structural units
of the nervous
tissue which exhibit
highly developed
properties of
excitability are
called neurons or
nerve cells.

9. Parts of a neutron:
CELL BODY OR
PERIKARYON
This contain a relatively
large nucleus with
scanty chromatin
materials and large
nucleolus. Its matrix the
neuroplasm is
basophilic and contains
organelles that include
the Nissl’s bodies or
chromophilic substance,
cytoskeletal filaments
called neurofibrils.

10. PROCESSES OF
NEURONS
The axon arises from a
conical elevation on the
perikaryon called the
axon hillock.
AXON
The axon is devoid of
Nissl’s bodies and is
thinner and much larger
than the dendrites of the
same neuron.

11. Axons are bounded by a
non-cellular sheath called
the myelin sheath.
AXON
There are axons that are
not derived by a myelin
sheath and are called
unmyelinated axons.
There are axons that are
not derived by a myelin
sheath and are called
unmyelinated axons.

12. PROCESSES OF
NEURONS
These processes serve as an
extension of the perikaryon.
DENDRITES
Dendrites arise near the
cell body.
Dendrites are thick but
tapered towards the end.
Dendrites are relatively
short and may be divided
into numerous branches by
variable sizes and shapes.

13. The surface of the dendrite
is covered with innumerable
minute projections or spines
which serve as sites of
synaptic contact.
DENDRITES
Its neuroplasm contains
neurofibrils, Nissl
bodies, mitochondria and
free ribosomes.

14. Types of neurons:
As to function:
UNIPOLAR
BIPOLAR
MULTIPOLAR
As to number and processes:
SENSORY
MOTOR
ASSOCIATION OR
INTERNUNCIAL

15. This refers to an axon
together with its
protective sheaths.
NERVE FIBER
Within the central
nervous system is
called the nerve
tract, and outside of
it is simply called a
nerve.

16. Structure of a nerve fiber: MYELIN SHEATH
A lipid covering of a nerve fiber in the peripheral
nervous system produced by Schwann cells.

17. Structure of a nerve fiber:
NODE OF RANVIER
Seen as periodic constriction along
the myelin sheath.

18. Structure of a nerve fiber: INCISSURE OF
SCHMIDT-
LANTERMANN
Interruptions in form of
oblique clefts at
internodes.

19. Structure of a nerve fiber:
SHEATH OF
SCHWANN
Transparent membrane
composed of a single of
layer cells surrounding
the myelin sheath for all
peripheral nerves,
segmented by the nodes
of Ranvier.
Schwann cells in intermodal
regions are vital in
regeneration of nerve in case
of injury.

20. Structure of a nerve fiber:
ENDONEURIUM
Also known as sheath of Henle or Key – Retzius; of
fine delicate connective tissue fibers and cells
located outside of the neurilemma.

21. Properties of Nerve Fibers:
Highly irritable
conductorFollows “all or non”
law
Conductivity;
impulse only
confined to
stimulated axon and
its branches to the
synapse.
Impulse along an
axon can be
weakened or blocked
by heat, cold,
pressure, drugs,
electric current or
anesthetics.