Asynaptic cleft, or synaptic gap, can be found between a neuron and

other neuron, a gland or a muscle cell.

Explanation:

Synapse refers to the region where the impulse is carried and the communication occurs between two neurons or between a neuron and a target cell. The target cells for motor neurons is a gland or muscle fiber. Therefore, a neuron can synapse with another neuron, with a gland or with a muscle fiber. The gap present at the synapse is called a synaptic cleft or synaptic gap that separates the two synapsed cells. The synapsed cells communication by neurotransmitters released from the presynaptic neuron.

"a.) well–developed vascular system."