Divisions of the Nervous System

The Central Nervous system The central nervous system is made up of the and the The central nervous system is made up of the Brain and the Spinal Cord Meninges – connective tissues that wrapped around the brain and spinal cord Cerebrospinal fluid – fluid that fills the space between the meninges and the brain and spinal cord – –acts as a shock absorber

The Brain The brain helps relay messages, process and analyze information Made up of 4 main parts TTTThe Cerebrum TTTThe Cerebellum TTTThe Brain Stem TTTThe Thalamus and Hypothalamus

The Cerebrum The largest part of the brain The largest part of the brain Responsible for voluntary, or conscious, activities of the body Responsible for voluntary, or conscious, activities of the body It is the site of intelligence, learning, and judgment. It is the site of intelligence, learning, and judgment.

The Cerebellum The second largest part of the brain and is located at the back of the skull. The second largest part of the brain and is located at the back of the skull. It coordinates and balances the action of the muscles so that the body can move gracefully and efficiently. It coordinates and balances the action of the muscles so that the body can move gracefully and efficiently.

The Brain Stem Connects the brain and spinal cord Controls the flow of information between the brain and the rest of the body

The Thalamus and Hypothalamus Are both found between the cerebrum and the brain stem. Are both found between the cerebrum and the brain stem. Thalamus – receives messages from the sense organs and relays the information to the proper region of the cerebrum. Thalamus – receives messages from the sense organs and relays the information to the proper region of the cerebrum. Hypothalamus – is the control center for recognition and analysis of hunger, thirst, fatigue, anger, and body temperature. Hypothalamus – is the control center for recognition and analysis of hunger, thirst, fatigue, anger, and body temperature.

The Spinal Cord The main communications link between the brain and the rest of the body The main communications link between the brain and the rest of the body Connects the brain to the rest of the body Connects the brain to the rest of the body Reflexes are processed directly in the spinal cord. Reflexes are processed directly in the spinal cord. Reflex – a quick, automatic response to a stimulus Reflex – a quick, automatic response to a stimulus

The Peripheral Nervous System Is made up of all the nerves and other cells that are not part of the brain and the spinal cord. Is made up of all the nerves and other cells that are not part of the brain and the spinal cord. Divided into sensory division and motor division Divided into sensory division and motor division

The Sensory division Transmits impulses from sense organs to the central nervous system Transmits impulses from sense organs to the central nervous system

The Motor division Is divided into two the somatic nervous system and the autonomic nervous system Is divided into two the somatic nervous system and the autonomic nervous system Somatic – regulates activities that are under conscious control Somatic – regulates activities that are under conscious control Autonomic – regulates activities that are automatic or involuntary. Autonomic – regulates activities that are automatic or involuntary.