Studied by 205 people
The nervous system is composed of
CNS and PNS
Glial cells
Cell that provides physical and chemical support to neurons and maintain their environment. In CNS and PNS.
CNS glial cells
oligodendrocytes astrocytes ependymal cells microglial cells
PNS glial cells
Schwann cells Satellite cells
Neurons
Information messengers Use electrical impulses and chemical signals
PNS
contains all nerves that lie outside of CNS
What is the role of the PNS?
to connect the CNS to organs, limbs, skin
Nervous tissue develops from
ectoderm
CNS is made of
the brain and spinal cord
Neurons can communicate with
glands, neurons, and muscles
Action potential
electrical signals
Neurotransmitters
chemical signals
Glial cells are
nonexcitable, meaning they do not receive signals
Injured nerves in the CNS are
not regenerative
Somatic nervous system
controls muscle movement and relays signals to eyes, ears, mouth
Peripheral nerves are
regenerative
Soma/ cell body
where all the genetic information is stored. organizes and keeps the cell functional
Function of an axon
where electrical impulses from the neuron travel away to be received by other neurons. transfers signals to other cells and organs.
Axon hillock
site of transmission between cell body and axon. generates impulse in the neuron
Where do you find the myelin sheath?
wrapped around each nerve cell
Myelin sheath is made of
fat and protein
Dendrites are
relatively short structures
Schwann cells
myelinating cells in PNS
Astrocytes
large star shaped glial cells in CNS that help hold nerve cells in place, help them develop and work the way they should
Microglial cells
small phagocytic glial cells in CNS.play a role in injury repair. protect CNS from microorganisms
Ependymal cells
glial cells in CNS that produce cerebrospinal fluid (CSF)
Cerebrospinal fluid (CSF)
eliminates waste in brain and spinal cord
Note 
Flashcard (116)