It makes meninges (pia mater, arachnoid
mater and dura mater) of brain and
spinal cord, capsules of ganglia and
Structural and functional tubular investments of nerves.
unit of nervous system
Non-excitable and non
conducting special cells
which nourish, protect and
maintain the neurons and
their processing
It consists of nerves (cranial
and spinal) and ganglia.
Also called capsule cells are small
cells that surround soma of neurons
of peripheral ganglia, constituting a
cellular capsule around the soma of
each neuron.
Only one process
extending from cell Also called neurolemmocytes are associated
with nerves fibres. All peripheral axons are
body or soma ensheathed by schwann cells and the
Schwann cells sheath of a nerve fibre is called
neurilemma.
Single layer of cuboidal
cells, which lines
cavities of brain and
central canal of spinal
cord.
Small elongated cells with
very finely branched
Star shaped cells having
numerous processes. processes.
These may be associated with They function as scavenger
neurons in gray matter i.e
protoplasmic astrocytes or cells or phagocytes
with nerve fibres in white matter
i.e fibrous astrocytes.
Only one process extending
Many process from the cell body but it Composed of those neural
extending from the divides into further two
cell body i.e many branches i.e an axon and a structures which convey sensitivity
dendrites and a dendrite. information from receptors in
single axon visceral organs of digestive ,
Small cells with a few respiratory, cardiovascular, urinary,
processes. Consist of neurons that and reproductive systems.
recieve and process
Processes of oligodendrocytes sensory input from
wind around axons and form
myelin sheaths, thus in CNS skin,skeletal
they perform same function as muscles ,tendons,joints,
that of schwann cells in PNS. tongue,nose,eyes and
ears.
Also known as relay This input is conveyed
neurons. to CNS via the cranial
and spinal nerves. Includes neural structures
These neurons Also known as motor involved in motor activities
comprise the CNS
neurons. that influence smooth ,
and thus interprets cardiac muscle and
Two processes extending the signals
from cell body i.e one Carry impulses from glands of skin and
axon and one dendrite the CNS to the viscera.
effectors i.e glands or Consists of nervous
muscles. pathways that descend
from brain and influence
lower motor neurons of
cranial and spinal nerves.
Iit results in contraction of
Also known as skeletal muscles.
sensory neurons.
Transfer impulses
from receptors to
the CNS. Predominant in quiet “rest and
digestion” conditions. Its main
purpose is to conserve energy
and to regulate functions like
Network of nerves that help body activate fight
digestion and urinaton.
or flight response, its activity increases when
you are stressed, in danger or physically active. It slows the heartbeat, slows
the breathing rate, lowers the
It dilates blood vessels , increases blood blood pressure and promotes
pressure,contraction of muscles, contraction of
heart, dilation of bronchi for more oxygen digestion.
exchange, and secretion of sweat from sweat
glands.
mater and dura mater) of brain and
spinal cord, capsules of ganglia and
Structural and functional tubular investments of nerves.
unit of nervous system
Non-excitable and non
conducting special cells
which nourish, protect and
maintain the neurons and
their processing
It consists of nerves (cranial
and spinal) and ganglia.
Also called capsule cells are small
cells that surround soma of neurons
of peripheral ganglia, constituting a
cellular capsule around the soma of
each neuron.
Only one process
extending from cell Also called neurolemmocytes are associated
with nerves fibres. All peripheral axons are
body or soma ensheathed by schwann cells and the
Schwann cells sheath of a nerve fibre is called
neurilemma.
Single layer of cuboidal
cells, which lines
cavities of brain and
central canal of spinal
cord.
Small elongated cells with
very finely branched
Star shaped cells having
numerous processes. processes.
These may be associated with They function as scavenger
neurons in gray matter i.e
protoplasmic astrocytes or cells or phagocytes
with nerve fibres in white matter
i.e fibrous astrocytes.
Only one process extending
Many process from the cell body but it Composed of those neural
extending from the divides into further two
cell body i.e many branches i.e an axon and a structures which convey sensitivity
dendrites and a dendrite. information from receptors in
single axon visceral organs of digestive ,
Small cells with a few respiratory, cardiovascular, urinary,
processes. Consist of neurons that and reproductive systems.
recieve and process
Processes of oligodendrocytes sensory input from
wind around axons and form
myelin sheaths, thus in CNS skin,skeletal
they perform same function as muscles ,tendons,joints,
that of schwann cells in PNS. tongue,nose,eyes and
ears.
Also known as relay This input is conveyed
neurons. to CNS via the cranial
and spinal nerves. Includes neural structures
These neurons Also known as motor involved in motor activities
comprise the CNS
neurons. that influence smooth ,
and thus interprets cardiac muscle and
Two processes extending the signals
from cell body i.e one Carry impulses from glands of skin and
axon and one dendrite the CNS to the viscera.
effectors i.e glands or Consists of nervous
muscles. pathways that descend
from brain and influence
lower motor neurons of
cranial and spinal nerves.
Iit results in contraction of
Also known as skeletal muscles.
sensory neurons.
Transfer impulses
from receptors to
the CNS. Predominant in quiet “rest and
digestion” conditions. Its main
purpose is to conserve energy
and to regulate functions like
Network of nerves that help body activate fight
digestion and urinaton.
or flight response, its activity increases when
you are stressed, in danger or physically active. It slows the heartbeat, slows
the breathing rate, lowers the
It dilates blood vessels , increases blood blood pressure and promotes
pressure,contraction of muscles, contraction of
heart, dilation of bronchi for more oxygen digestion.
exchange, and secretion of sweat from sweat
glands.
