In somatic neurons, an action potential arrives at the synapse causing synaptic vesicles to fuse with the presynaptic membrane.
The presynaptic membrane is a specialized region of the axon terminal membrane that faces the plasma membrane of neurons or muscle fibers whose axon terminals form synapses.
Presynaptic membrane of neurons that releases neurotransmitters into the synaptic cleft between neurons.
The neurons that make up the somatic nervous system project outward from the CNS and connect directly to the muscles of the body, carrying signals from muscles and sensory organs back to the central nervous system.
These types of neurons transmit signals from the spinal cord and brainstem to skeletal and smooth muscles, directly or indirectly controlling muscle movement. Muscle contraction is caused by the activation of motor neurons that supply skeletal muscle.
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