Final answer:
The polysynaptic part of the reflex is known as the visceral reflex, which involves multiple synapses with interneurons in the spinal column, transferring information to the brain.
Step-by-step explanation:
The polysynaptic part of the reflex is also known as the visceral reflex. A typical reflex involves a direct, monosynaptic connection between a sensory neuron and a motor neuron. However, some reflexes are more complex and involve multiple synapses with interneurons in the spinal column. These interneurons transmit information to the brain about what occurred, as in the case of hand withdrawal from a hot object.
In the context of adrenergic synapses, norepinephrine is released and binds to either α- or β-adrenergic receptors, which are located on the postganglionic neurons in the efferent branch of the reflex arc. The afferent branch component represents the input from a sensory neuron, communicating information from either a special or general sense toward the central nervous system.
The efferent branch begins with a projection from a central neuron along the preganglionic fiber, which synapses on a ganglionic neuron and then projects to the target effector. In some autonomic reflexes, there are varicosities that form networks of connections within the target tissue.