Non-synaptic transmission is characteristic of autonomic neuroeffector junctions. The
structure of the autonomic neuromuscular junction is described. The essential features are
that: the terminal portions of autonomic nerve fibers are varicose and mobile, transmitters
being released 'en passage'from varying distances from the effector cells; while there is no
structural post-junctional specialization on effector cells, receptors for neurotransmitters
accumulate on cell membranes at close junctions; muscle effectors are bundles rather than …