Structure of Nervous Tissue Flashcards
what is nervous tissue
main compound of the nervous system
what does nervous tissue do
creates nerve impulses that travel from one part of the body to another in a few milliseconds
what are the types of nervous tissue
neurons & glial cells
what are neurons
specialised cells that conduct information (electrical impulses)
what are the components of a neuron
myelin sheath
Schwann cells
cell body
dendrite
axon terminals
axon
node of ranvier
what do glial cells do
provide protection & support to nervous tissue. these are in direct contact with neurons and often surround them
what are the types of glial cells
astrocytes, oligodendrocytes, Schwann cells, satellite cells
what are the types of neurons
sensory, motor, interneurons
whats the function of a sensory neuron
responsible for transmitting impulses from sensory organs to the central nervous system
whats the function of a motor neuron
send impulses from central nervous system to specific muscles or organs
whats the function of interneurons
transmit impulses between sensory & motor neurones within brain or spinal cord
where are sensory neurons located
PNS
where are motor neurons located
CNS
where are interneurons located
CNS
what does the myelin sheath do
surrounds most sensory & motor neurons - acts as electrical insulator which helps speed up the conduction of action potentials & protects neuron from damage
