Transcript Histology of Nervous Tissue

Histology of
Nervous Tissue
Astrocytes
 Anchors
nervous tissue to surrounding
tissues
 Allows for x-changes of materials between
nervous tissue and fluids
 Barrier between neuron and blood
 Part of blood brain barrier
Microglia
 Phagocytes
 Clean
up wastes, debris, and
bacteria/virus
 Immune function for the neuron
Ependymal Cells
 Brain
and Spinal Cord Only
 Line the cavities of the CNS
 Produce Cerebral Spinal Fluid (CSF)
 This fluid helps to protect and nourish the
cells of the CNS
 Specialized Fluid
Oligodendrocytes
 Wrap
nerve fibers
 Similar to a burrito shell around its contents
 Covering is called the “myelin sheath”
 Found in CNS Only
 Insulates the neuron for faster transmission
of action potentials
 Neurons are called “white matter” if they
have this wrapping
Schwann Cells
 PNS
(Peripheral Nervous System) Only
 Myelin Sheaths of the neurons out of the
CNS
 Same Function
 White matter is term for neurons with this
covering
Satellite Cells
 Surround
the cell bodies of the neuron
 Cell body is the “cell” part of a neuron
contains all normal cell organelles and
DNA
 Protection of the cell body is the main
function
How does Glia Differ from a
Neuron
 Glia
has the ability to repair itself if
damaged
 Glia cannot generate an action potential
 More glial tissue than nervous tissue
 Glia is the protective/caretaker material
associated with nervous tissue