Nerve: is a group of nerve fibers outside CNS e.g. brachial nerve.
Tract: is a group of nerve fibers inside CNS e.g. spinothalamic tract.
Nucleus: is a group of nerve cell bodies inside CNS e.g. supra optic nucleus.
Ganglion: is a group of nerve cell bodies outside CNS e.g. coeliac ganglion.
Synapse: is a junction of two neurons e.g. axo-somatic, axo-dendritic or axo-axonal synapse.
Sensory nerve: is afferent nerve carrying nervous impulse from peripheral organ towards CNS e.g. optic nerve.
Motor nerve: efferent nerve carrying nervous impulse from CNS to peripheral organ e.g. & occulomotor nerve.
Neurotransmitters: are chemical messengers released from one neuron and act on next neuron ; across a synapse to transmit nerve impulse e.g. acetylcholine, nor-epinephrine.
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