Question

select the correct word into each sentence to describe the neural pathway of an autonomic motor signal.

1. in autonomic motor pathways, the nerve signal must travel along (click to select) neurons to reach a target cell.
2. the first neuron emerges from the cns and synapses with a second neuron in a (click to select) outside the cns.
3. the second neurons axons extend to the (click to select) from the ganglion.
4. the first neurons are called (click to select) and are myelinated.
5. the second neurons are called (click to select) and are unmyelinated.

(click to select)
ganglion
target cell
third neuron
three
two
preganglionic
postganglionic

Explanation:

1. In autonomic motor pathways, there are two - neuron chains. The first neuron (preganglionic) and the second neuron (postganglionic).
2. The first neuron (preganglionic neuron) emerges from the central nervous system (CNS) and synapses with the second neuron in a ganglion (a cluster of neuron cell bodies outside the CNS).
3. The second neuron's (postganglionic neuron) axons extend to the target cell (the cell that will respond to the autonomic signal, like a smooth muscle cell, cardiac muscle cell, or gland cell).
4. The first neurons are called preganglionic neurons. Myelination (a fatty sheath around the axon) is present in preganglionic neurons for faster signal conduction from the CNS.
5. The second neurons are called postganglionic neurons. They are unmyelinated as the distance from the ganglion to the target cell is relatively short, and the slower conduction speed (due to lack of myelin) is sufficient for the local signaling in the autonomic nervous system.

Answer:

1. two
2. ganglion
3. target cell
4. preganglionic
5. postganglionic