Lecture 17: Cells of the nervous system Flashcards
What are the four types of CNS glia cells?
- Microglia
- Ependymal
- Astrocytes
- Oligodendrocytes
What is the function of astrocytes glia cells?
- supply nutrients to neutrons
- ensheath blood capillaries
What is the function of ependymal glia cells?
- have cilia ti circulate CSF
What is the function of microglia?
- immune cells
- engulf micro organisms and debris
What is the main PNS glia cell?
- Schwann cell
What is the function of a schwann cell?
- unsheathes neurons with myelin
- lipid wrapped around axon that increases conduction velocity
What is the function of oligodendrocytes?
- covers neurons with myelin
What is the neuron type where multiple processes emanate from the cell body?
Multipolar
What is the neuron type where two processes emanate from the cell body?
Bipolar
Pseudo/unipolar is when?
one process emanates from the cell body which then branches into dendrite and axon
What structure in the summation zone of a neuron controls whether the signal transmits further?
axon hillock
What happens in the input zone?
Dendrites and cell body receive chemical signals
What happens is the summation zone?
- axon hillock controls whether to transmit the signal further
What happens in the conduction zone?
- AP is carried alone the axon
What happens in the output zone?
- neurotransmitters are released from the axon terminal
