35-3 Divisions of the Nervous System

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A. The Central Nervous System (CNS)

• 1. The CNS is made up of the brain and spinal cord.

A. The Central Nervous System (CNS)

• 2. The function of the CNS is to send messages, process information, and analyze information.

B. The Brain

• 1. The cerebrum is the largest region of the human brain.

B. The Brain

• 2. The cerebrum controls voluntary (controlled) actions of the body.

B. The Brain

• 3. The cerebellum is the 2nd largest region of the brain located in the back of the skull.

B. The Brain

• 4. The brain stem connects the brain and spinal cord.

B. The Brain

• 5. The thalamus receives messages from all the sensory receptors and sends the information to the cerebrum.

B. The Brain

• 6. The hypothalamus is the control center for recognition and analysis of hunger, thirst, fatigue, anger, and body temperature.

C. The Spinal Cord

• 1. The spinal cord processes some reflexes.

C. The Spinal Cord

• 2. A reflex is a quick automatic response to a stimulus.

D. The Peripheral Nervous System (PNS)

• 1. The PNS is made up of all the nerves that are outside of the brain and spinal cord.

D. The Peripheral Nervous System (PNS)

• 2. The sensory division sends impulses from sense organs to the central nervous system.

D. The Peripheral Nervous System (PNS)

• 3. The motor division sends impulses from the central nervous system to the muscles.

D. The Peripheral Nervous System (PNS)

• 4. The somatic nervous system controls conscious movements, such as muscle movement.

D. The Peripheral Nervous System (PNS)

• 5. A reflex arc includes a sensory receptor, sensory neuron, motor neuron and effector.

D. The Peripheral Nervous System (PNS)

• 6. The autonomic nervous system regulates involuntary movements.