Nervous tissue Flashcards
Name the two cell types in nervous tissue
neurons and glial cells
what are neurones and their function
nerve cells, function unit of nervous system send signals around the body
what is the function of glial cells
(neuroglia)
protect, provide nutrients and immune functions to neurones (support cells)
what are dendrites and their function
- branched, extending from cell body
- form synapses with adjacent neurons
- respond to external nuclei
- convey incoming info to cell body
Cell body components
large nucleus, Nissl bodies - clumps of rough ER
Numerous mitochondria
Axon function
propagate single from the cell body towards axon terminals
Conduct APs
PNS - myelinated or non
CNS - just myelinated
Terminal boutons function
form synapses with other neuron’s
communication junctions (neuromuscular)
neurotransmitters related & convey message to next cell pathway
CNS cells (brain & spinal cord)
ependymal cells
astrocytes
microglia
oligodendrocytes
PNS cells - spinal nerves & cranial nerves
Satellite & Schwann cells
Characteristics of ependymal cells
simple ciliated cuboidal
lines ventricles & spinal cord
NO BASEMENT MEMBRANE
Astroctyes characteristics
star shape
numerous glial cells
form blood brain barrier
regulate chemical environment
microglia characteristics
small size
phagocytic capacity
remove invading microbes & dead cells
what are Oligodendrocytes
Oligodendrocytes are the myelinating cells of the central nervous system (CNS).
function of oligodendrocytes
form myelin sheaths around CNS axons
structural and metabolic support
function of Schwann cells
