nervous Flashcards
it has led to the differentiation of cells in which the capacity of excitability is particularly announced
phylogenetic development
a mass of villi that originate from the trls choroidea and form fuzzy tuft of epithelium that extends into brain vesicles
choroid plexus
fundamental functional units of nervous
neurons
the expa ded part of the nueron
perikaryon
shorter and thicker than axons
dendrites
junction where a neuron communicates with another neuron kr an effector cell
synapse
single long process arises from the bulging portion of cell body
axon
bulging portion of cell body
axon hillock
the end of the axon which gives off terminal branches called
telodendron
a chemical released by telodendron which acts on a membrane
neurotransmitter
an axon is enveloped by one fold of plasma membrane of neurolemmal cells
unmyelinated nerve fiber
an axin enveloped by plasma membrane of olidodendrocytes or neurolemmocytes that wraps spirallt around it several times to form lipid rich myelin sheath
myelinated nerve fiber
myelination starts when
point where axon emerges from axon hillock
rhe myelon sheath is discontinues at interval called
myelin node (node of ranvier)
bulb like junction between 2 adjacent neurolemmal cells
areas of axon covered by myelin sheath are called
internodes
sites of impulse propagation snd saltatory conduction
internodes
cytoplasmic region of myelin between internode and the node kf ranvier
paranode
an area of loosening of the myelin sheath
schimdt-lanterman
keeps the transmembrane potential at normal levels
sodium potassium pump
epithelial cells of fhe neural tube differentiates into
bipotential progenitor celss
multipolar neurons that comprise the majority if neurons in body
transmission
what does the secretory neurons secrete
oxytocin and antidiuretic
protects supports and supply nourishment ro the nervous tissue
neuroglial cells
