Lesson 9 - Flashcards
What are neurotubules responsive for?
Cellular transport (bringing stuff to and from the cell body)
What does the myelin sheath act as?
insulation for the nerve, preventing the electrical impulse from escaping the neuron
also speeds up process of action potential
What are Nodes of Ranvier?
Crucial in allowing the propogation of the nerve impulse down the axon
Allows a jumping conduction of this nerve impulse
What are the 6 types of glial cells?
ASTROCYTE
OLIGODENDROCYTE
MICROGLIA
EPENDYMAL CELL
Satellite cell
Schwann cell
What is the jumping condition known as that occurs in the Nodes of Ranvier?
Saltatory conduction / conduction by Saltation
What are glial cells’ roles?
Interact with neurons, act as support for the neurons with their function of communication within the nervous system
What are the 4 types of glial cells that are in the cns?
astrocyte
oligodendrocyte
microglia
ependymal cell
what are 2 types of glial cells in the pns?
satellite cell
shwann cell
What is the function of the astrocyte?
Purely supportive
Maintains chemical concentrations in the extracellular space
Has reparative functions - can repair and react to tissue damage
Contributes to the blood brain barrier - substances circulating blood cant enter cns at will - difficult passing the blood brain barrier (Separates the blood from the brain)
Removes waste
What is the function of the Oligodendrocyte cell?
Insulates the axons, providing the myelin sheath around the axon.
Extends from the cell body to encapsulate multiple axon segments.
What is the function of the satellite cell?
Supportive role (broad)
Surrounds sensory and autonomic ganglia in the PNS
These cells regulate the micro-environment of those ganglia in the PNS
What is the function of the Schwann cell?
Insulates the axons, providing the myelin sheath around the axon.
What is the function of the microglia cell?
IMMUNE SUPPORT
Ingest pathogens and cells
What is the function of the ependymal cell?
filter blood to make cerebrospinal fluid , fluid that flows thru cns lubricates neural structures and acts as a protective cushion for neural structures.
