synaptic gap

n.
The minute space between the cell membrane of an axon terminal and that of the target cell with which it synapses.

A fluid-filled gap, approximately 40 nm wide, which separates a presynaptic membrane of one neurone from a post-synaptic membrane of another neurone or a muscle fibre, across which neurotransmitter substances diffuse.

n.

The minute space between the cell membrane of an axon terminal and of the target cell with which it synapses. Also called synaptic cleft.