USMLE Step 1 Physiology Review 54 06 Autonomic Nervous System (1 of 5)

USMLE Step 1 Physiology Review 54 06 Autonomic Nervous System (1 of 5)

 

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Play USMLE Audio MP3 54 06 Autonomic Nervous System (1 of 5) Below

Begin 54 06 Autonomic Nervous System (1 of 5) Transcription

Okay, now for some questions about the autonomic nervous system.

The peripheral nervous system is composed of the somatic nervous system and what other nervous system?

  •  The autonomic nervous system, abbreviated as ANS.

What three broad categories of muscle and/or structures does the ANS innervate? List the muscle types first and then any structure innervated by the ANS. Please pause the tape.

  • First, cardiac muscle.  Second, smooth muscle.  Third, glands.

What does the somatic nervous system innervate?

  • Skeletal muscle.

What kind of innervations is critical for the central nervous system to process autonomic motor outflow?

  • Sensory or afferent innervations; that’s afferent with an “a”.

Does afferent innervation flow from visceral organs to central nervous system or from central nervous system to visceral organ?

  • Afferent innervation flow from visceral organ to CNS.

What are the two major anatomic divisions of the autonomic nervous system?

  • The parasympathetic nervous system and the sympathetic nervous system.

In both divisions neurons connected in series carry efferent information, that’s efferent with an “e”. Since it is efferent information, is the flow from end organ to CNS or CNS to end organ?

  • The flow of efferent with an “e”, the flow of efferent information is from CNS to effector or end organ.

Student Doctor, please pause the tape and summarize the information discussed thus far on the peripheral control of the autonomic nervous system.

The peripheral nervous system is composed of the somatic nervous system and the autonomic nervous system, abbreviated as ANS. The ANS innervates cardiac muscle, smooth muscle and glands. The somatic nervous system innervates skeletal muscle.  Sensory or afferent innervation is critical for the central nervous system to process autonomic motor outflow.  Afferent with an “a”, afferent innervation flows from visceral organs to CNS. The two major anatomic divisions of the autonomic nervous system are the parasympathetic nervous system and the sympathetic nervous system. In both divisions neurons connected in series carry efferent with an “e”, efferent information. The flow of efferent information is from CNS to effector or end organ.

 

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