Central Nervous System Overview

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5 Questions

What is the pathway through which a rapid response (reflex) is produced?

Reflex arc

How does the reflex arc contribute to fast responses?

By bypassing the brain

What part of the nervous system regulates activities that are not under conscious control?

Autonomic nervous system

What are the two equally important parts of the autonomic nervous system?

Sympathetic and parasympathetic nervous system

What is the general function of the sympathetic nervous system?

Prepare the body for intense activity

Study Notes

Central Nervous System

  • The central nervous system, including the brain and spinal cord, is contained within the bony structures of the skull and vertebral column.

Brain Function

  • Specific brain regions receive sensations from various body areas.
  • Commands to muscles originate in other brain areas.

Spinal Cord

  • The spinal cord contains most neurons that enter and leave the brain.
  • It links the brain to the rest of the body.

Peripheral Nervous System

  • The peripheral nervous system consists of nerves and associated cells outside the brain and spinal cord.
  • It has two major divisions: sensory and motor.

Sensory Division

  • The sensory division consists of receptor cells that gather information and sensory neurons that transmit impulses from sense organs to the central nervous system.

Motor Division

  • The motor division transmits impulses from the central nervous system to muscles and glands.
  • Messages are relayed through the somatic nervous system and autonomic nervous system.

Somatic Nervous System

  • The somatic nervous system regulates activities such as skeletal muscle movement.
  • Some actions are under voluntary control, such as lifting a finger or wiggling toes.
  • Other actions occur automatically, like recoiling from pain when stepping on a tack.

This quiz provides an overview of the central nervous system, including the brain and spinal cord, and its functions in sensing, processing, and controlling the body. It covers the connection between different body areas, muscle commands, and the role of the peripheral nervous system.

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