Ever wondered how sensory and motor functions are accomplished by the nerves? These are carried out by a process called neurotransmission or synaptic transmission between nerve endings. Nerve endings possess vesicles containing neurotransmitters which are signalling molecules released during transmission of signals between nerve endings. To propagate signals for motor or sensory functions the released neurotransmitters bind to the adjoining nerve ending and cause a series of cell changes that result in nerve impulses. These ultimately lead to muscle action, release of bodily secretions and other organ functions.
The orange and blue vesicles in this image captured by scanning electron microscopy contain neurotransmitters that are released from nerve endings (green) during synaptic transmission. (from Brighthub.com – link)
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