All of the following characterize the ANS except
a. A two-neuron efferent chain
b. Presence of neuron cell bodies in the CNS
c. Presence of neuron cell bodies in the ganglia
d. Innervation of skeletal muscles

Verified step by step guidance

Step 1: Understand the Autonomic Nervous System (ANS) characteristics. The ANS controls involuntary functions and typically involves a two-neuron efferent pathway: a preganglionic neuron with its cell body in the CNS and a postganglionic neuron with its cell body in a peripheral ganglion.

Step 2: Analyze option (a): 'A two-neuron efferent chain.' This is a defining feature of the ANS, where signals travel from the CNS to a ganglion and then to the target organ.

Step 3: Analyze option (b): 'Presence of neuron cell bodies in the CNS.' The preganglionic neurons of the ANS have their cell bodies in the CNS, so this is true for the ANS.

Step 4: Analyze option (c): 'Presence of neuron cell bodies in the ganglia.' The postganglionic neurons of the ANS have their cell bodies in autonomic ganglia, so this is also true.

Step 5: Analyze option (d): 'Innervation of skeletal muscles.' The ANS does not innervate skeletal muscles; instead, the somatic nervous system controls skeletal muscle. Therefore, this option does not characterize the ANS.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Autonomic Nervous System (ANS) Structure

The ANS typically consists of a two-neuron efferent pathway: a preganglionic neuron with its cell body in the CNS and a postganglionic neuron located in peripheral ganglia. This structure allows for modulation of involuntary functions.

Location of Neuron Cell Bodies in the ANS

In the ANS, preganglionic neuron cell bodies reside in the central nervous system (brain or spinal cord), while postganglionic neuron cell bodies are found in autonomic ganglia outside the CNS. This arrangement is key to autonomic signal transmission.

Target Innervation of the ANS

The ANS innervates involuntary effectors such as smooth muscle, cardiac muscle, and glands. It does not innervate skeletal muscles, which are controlled by the somatic nervous system, making this a distinguishing feature.

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