Introduction to Nervous Tissue Flashcards
(26 cards)
what is the function of nervous tissue?
carries information throughout the body via electrical impulses
what forms the CNS
brain and spinal cord
what forms the PNS
cranial nerves and spinal nerves
what is the function of the nervous system
provide rapid and precise communication between different parts of the body via the action of neurons
where do nerve cells come from?
neurons
where do support cells come from?
glial cells
what do nerve cells do?
send signals around the body
what do glial cells do?
protect, provide nutrients and immune functions to the neurons
what is a neuron specialised for?
intercellular communication
what is the structure of the neurons
dendrites, large cell body, single axon, terminal boutons
comment on dendrites
highly branched processes extending from cell body. form synapses with adjacent neurons. respond to external stimuli. convey incoming information to cell body
comment on the cell body
contains usual cellular organelles - large nucleus, nissl bodies, numerous mitochondria, no centrioles
comment on the axon
rapidly propagates signal from cell body towards axon terminals. specialised to conduct action potentials. PNS - myelinated or non-myelinated. CNS - myelinated
what does the neuroglia do?
protect and support neurons
are ependymal cells part of the CNS or PNS?
CNS
are astrocytes part of the CNS or PNS?
CNS
are microglia part of the CNS or PNS?
CNS
are oligodendrocytes part of the CNS or PNS?
CNS
are satellite cells part of the CNS or PNS?
PNS
are schwann cells part of the CNS or PNS?
PNS
what do ependymal cells do?
line fluid-filled cavities in brain (ventricles) and spinal canal
what do astrocytes do?
form the blood brain barrier and regulate the chemical environment
what do microglia do?
remove invading microbes and dead cells from CNS
what do oligodendrocytes do?
form myelin sheaths around ll CNS axons and provide structural and metabolic support
