ap nervous tissue Unit 2

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ap nervous tissue unit 2

neuron

fundamental unit of the nervous system.
this is the cell that is stimulated & responsible for transmitting nervous impulses.

Nissl bodies

dark structures scattered throughout the cytoplasm of the neuron.
these structures are mainly RER that are responsible for protein synthesis

neurofibrils

very thin threads that extend into the axon to support it.

synaptic knob

- located at the end of an axon
- contains the chemical neurotransmitter that will be released to carry the electrical message from the neuron to the next cell

synapse

the area that encompasses the synaptic knob, synaptic cleft and the postsynaptic membrane.

myelin sheath

- may be covering on the axons in the peripheral nervous system.
- formed by neurolemmocytes (Schwann cells).
- Fatty material that serves as insulation.

neurilemma

the membranous sheath of the neurolemmocyte around the axon.

nodes of ranvier

the gaps between the neurolemmocytes (schwann cells) covering each axon

sensory or afferent neurons

transmit impulses from sensory receptors to the CNS

motor or efferent neurons

transmit impulses from the CNS to the muscles or glands

interneurons

found only in the CNS where they connect neuron to neuron

dendrites

one of three important parts to every neuron

Processes of the neuron that receive information from other cell or stimuli & transmit the message to the cell body.
Monitor the environment, internal & external

neuroglia or glia cells

the other type of cell found in the nervous tissue
(the other is the neuron)
functions: support, nourishment & protection

Schwann cell

glia cell, found only in PNS
aka neurolemmocyte

neurolemmocyte

glia cell, found only in PNS
aka Schwann cell

cell body

control center for the neuron. If cell body dies, then neuron dies

axon

one of the three major parts of a neuron
-Process that conducts the message away from the cell body towards other cells.

Bundle of Axon in PNS

is a nerve

Bundle of Axon in CNS

is a tract

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