NERVOUS SYSTEM ORGANIZATION

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What are the two main divisions of the nervous system?

Central Nervous System (CNS) and Peripheral Nervous System (PNS)

What does the Central Nervous System (CNS) include?

Brain and spinal cord; integrative control center

What is the role of the Peripheral Nervous System (PNS)?

Communication between CNS and body via cranial and spinal nerves

What are the two divisions of the PNS?

Sensory (Afferent) Division and Motor (Efferent) Division

What is the function of the Sensory (Afferent) Division?

Conducts signals from receptors to the CNS using sensory neurons

What is the function of the Motor (Efferent) Division?

Conducts signals from the CNS to effectors using motor neurons

What are the two branches of the Motor (Efferent) Division?

Autonomic Nervous System and Somatic Nervous System

What does the Autonomic Nervous System control?

Involuntary responses

Examples: Heartbeat, digestion, pupil dilation, respiratory rate.

What does the Somatic Nervous System control?

Voluntary movement

Examples: Walking, writing, lifting a cup, throwing a ball.

What are the two divisions of the Autonomic Nervous System?

Sympathetic Division and Parasympathetic Division

What is the role of the Sympathetic Division?

Mobilizes body systems; "fight or flight" responses

What is the role of the Parasympathetic Division?

Conserves energy; "rest and digest" responses

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