Question

somatic and autonomic nervous systems compared
our previous discussions of nerves in the efferent (motor) division of the pns have focused on the somatic nervous system, the pns subdivision that controls our skeletal muscles. so, before plunging into a description of (1 ) nervous system anatomy, lets note some important differences between the somatic and autonomic subdivisions of the pns
besides differences in their effector organs and in the neurotransmitters they release, the patterns of their (2 ) pathways differ. in the somatic division, the cell bodies of the motor neurons are inside the cns, and their axons (in spinal nerves) extend all the way to the (3 ) muscles they serve. the autonomic nervous system, however, has a chain of two motor neurons. the first motor neuron of each pair, the preganglionic neuron, is in the brain or spinal cord. its axon, the (4 ) axon (literally, the “axon before the ganglion”), leaves the cns to form a synapse with the second motor neuron in a ganglion outside the cns. the axon of this ganglionic neuron, the (5 ) axon, then extends to the organ it serves. (figure 7 - 26 summarizes these differences.)

o 1 postganglionic 2 autonomic 3 motor 4 skeletal 5 preganglionic

o 1 skeletal 2 preganglionic 3 postganglionic 4 autonomic 5 motor

o 1 autonomic 2 motor 3 skeletal 4 preganglionic 5 postganglionic

o 1 preganglionic 2 postganglionic 3 autonomic 4 motor 5 skeletal

o 1 motor 2 skeletal 3 preganglionic 4 postganglionic 5 autonomic

Explanation:

The text is comparing the somatic and autonomic nervous systems. The somatic nervous system controls skeletal muscles. The autonomic nervous system has a two - neuron chain with preganglionic and postganglionic neurons. Preganglionic axons leave the CNS to synapse with postganglionic neurons in ganglia outside the CNS. The third blank refers to skeletal muscles as the somatic nervous system serves them. The fourth blank is preganglionic as it's the axon leaving the CNS before the ganglion. The fifth blank is postganglionic as it's the axon extending from the ganglionic neuron to the organ. The first blank is autonomic as the text is about to describe its anatomy after discussing the somatic system. The second blank is motor as it's talking about motor pathways.

Answer:

1. autonomic
2. motor
3. skeletal
4. preganglionic
5. postganglionic