29.4 Central and Peripheral Nervous Systems Set up Cornell Notes on pg. 51 Topic: 29.4 Central and Peripheral Nervous System Essential Question(s): 1. On pg. 50 fill out the tree map with descriptions (function/examples) of each part of the nervous system 2.1 Atoms, Ions, and Molecules 29.4 Central and Peripheral Nervous System KEY CONCEPT The central nervous system interprets information, and the peripheral nervous system gathers and transmits information.

29.4 Central and Peripheral Nervous Systems The Nervous System Central Nervous System (CNS) Peripheral Nervous System (PNS) Brain Spinal Cord Somatic N.S. Autonomic N.S. Cerebrum Cerebellum Brainstem Sympathetic N.S. Parasympathetic N.S. Reflexes Function Example Function Example Function Midbrain Pons Medulla Oblongata Function Examples

29.4 Central and Peripheral Nervous Systems KEY CONCEPT The central nervous system interprets information, and the peripheral nervous system gathers and transmits information.

29.4 Central and Peripheral Nervous Systems The nervous system’s two parts work together. The Central Nervous System (CNS) includes the brain, and spinal cord. Function: Processes information The Peripheral Nervous System (PNS) includes four systems of nerves Function: links the CNS to muscles and organs.

29.4 Central and Peripheral Nervous Systems The brain has three parts. 1. cerebrum controls thought, movement, emotion 2. cerebellum located in back of skull, balances the actions of muscles so body can move smoothly midbrain pons medulla oblongata 3. brain stem controls basic life functions (breathing, heart beat) Brain stem The CNS:

29.4 Central and Peripheral Nervous Systems The brain stem has three parts. –midbrain controls some reflexes –pons regulates breathing –medulla oblongata connects the brain and spinal cord and controls heart function, swallowing, coughing, vomiting midbrain medulla oblongata pons

29.4 Central and Peripheral Nervous Systems The somatic nervous system regulates voluntary movements Ex: Walking –sympathetic nervous system: action and stress (Fight or Flight) –parasympathetic nervous system: calms the body, conserves energy The autonomic nervous system controls involuntary functions Ex: Digestion The Peripheral Nervous System: Collection of nerves that links the CNS to muscles and other organs (Sensory neurons/motor neurons) *Maintain homeostasis

29.4 Central and Peripheral Nervous Systems

The CNS and PNS pass signals between one another. 1. Sensory receptors in PNS generate an impulse PNS passes impulse to CNS 3. PNS stimulates a response 2.CNS interprets impulse CNS passes impulse to PNS.

29.4 Central and Peripheral Nervous Systems If you have a question, you will raise your hand to ask it. How do your CNS and PNS work together to allow you to raise your hand? Your CNS passes a signal to a motor neuron in your PNS causing you to raise your hand.

29.4 Central and Peripheral Nervous Systems 11 Reflex arc- A simple pathway, including only a few neurons, that carry out the simplest responses…reflexes. Reflexes – automatic, subconscious responses to external or internal stimuli Maintain homeostasis by controlling: heart rate, breathing rate, blood pressure, digestion, swallowing, sneezing, coughing, and vomiting

29.4 Central and Peripheral Nervous Systems The spinal cord controls reflexes. –sensory neuron sends impulse to spinal cord –spinal cord directs impulse to motor neuron –does not involve the brain!!!! interneuron motor neurons sensory neuron Stimulus

29.4 Central and Peripheral Nervous Systems Spinal Cord 5 6 Label the parts of this reflex arc: Key: Effector Motor Neuron Receptor Interneuron Sensory Neuron Stimulus 1

29.4 Central and Peripheral Nervous Systems 14 2 Receptor 3 Sensory neuron 4 Interneuron 5 motor neuron 6 Effector Spinal cord 1 Stimulus

29.4 Central and Peripheral Nervous Systems 15 Receptor  Sensory neuron  Interneuron  Motor neuron  Effector