Nervous Tissue Flashcards
What 2 major cells does nervous tissue consist of
Neuronal and Gilial (Supporting)
Neuronal cells transmit signals thru the nervous system. What form are these signals in
electric currents
What specalised areas do the nerve cells communicate with each other thru
Synapses
Transmission of info across a synapse happens thru the release of what
neurotransmitters
Name 6 types of neurotransmittera
acetylchlorine, biogenic amines, amino acid, ATP, Peptides and dissolved gases
Name the 3 main parts of a neuron cell
soma, dendrites and axon
What does the soma contain
nucleus ER (as darkly-stained Nissl bodies) mitochondria extensive cytoskeleton ribosomes
Purpose of dendrites
extensions of the cell that recieve info
purpose of axon/nerve fibre
transmits info away from cell body
Do gilial cells transmit info
no
purpose of gilial cells
supporting cells, support the survival and function of neuronal cells
3 types of supporting cells
oligodendrocyte, astrocytes, ependymal cells
insulating substance produced from oligo is called what
myelin
function of astrocytes
hold things together, maintain structure andt vascular supply
2 types of astrocytes
fibrous and protoplasmic
What type of cell acts as an epithelial lining for the cavities within the CNS
Ependymal cells
What is secreted by Ependymal cells
CSF
What is myelin
a phospholipid (fatty substance(
what does myelin do
speeds up nerve impulse transmission across the axon
6 types of supporting cells
oligodendrocyte, astrocytes, ependymal cells, microglia, satellite cells, schwann cells
what does myelin do
speeds up nerve impulse transmission across the axon
Function of micrglia
protective immune function, become phagocytic
functions of satellite cells
formed in peripheral ganglia
which giglial cells are CNS and which are PNS
CNS - astro, oligo, ependy, microglia. PNS - Satellite and schwann
function of Schwann
Produce Myelin, cover axon
what is a myelinated axon
multiple layers around singular axon, protects and isolates from environment, multiple axons
what is an unmyelinated axon
wraps around multiple singular axon.
