Nervous Tissue Flashcards
derived from neural ectoderm
nervous tissue
tissue composed of what?
neurons (nerve cell) and gliocytes (supporting cells)
amorphous ground substance - minimal. fibers: mainly very fine collagen.
intercellular substance
major component of nervous tissue and classified as neuron and gliocyte.
cells
produced by ependymal cells of the choroid plexus.
cerebrospinal fluid
is a mass of villi that originate from the tela choroidea and form a fuzzy tuft of epithelium that extends into the brain vesicles.
choroid plexus
cell membrane in nervous tissue is called?
neurolemma
cytoplasm in nervous system is?
neuroplasm
are highly secretory and they have lots of RER.
neurons
is visible as a clump of basophilic materials in the perikaryon except in the axon hillock and axon.
chromophilic substance
that transmits impulses
axon
that receives impulses
dendrite
the junction where a neuron communicates with another neuron or an effector cell is called?
synapse
the terminal part of the axon releases a chemical called?
neurotransmitter
single long process that arise from the bulging portion of the cell body
axon hillock
wraps spirally around it several time to form the lipid-rich.
myelin sheath
starts at the point where the axon emerges from the axon hillock
myelination
myelin sheath is discontinuous at intervals called?
myelin node
bulb like junction between two adjacent neurolemmal cells
myelin node
is the cytoplasmic region of myelin between the internode and the node of ranvier.
paranode
it is the small circular profiles in the axoplasm
neutotubules
are numerous in the axon, providing the power to run the sodium potassium pump that keeps transmembrane potential at normal levels.
mitochondria
based on the number of cell processes
✓ unipolar neuron
✓ pseudounipolar neuron
✓ bipolar neuron
✓ multipolar neuron
based on function of neuron
- transmission or conducting neurons
- secretory neurons