intro to nervous system
TRANSCRIPT
![Page 1: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/1.jpg)
Construct Interactive Notes
7 pages of binder paperOn cover, write• Chapter 8: Nervous System• Name, period, seat #• Color illustration
![Page 2: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/2.jpg)
Introduction to the Nervous System (pg 2)
![Page 3: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/3.jpg)
StructuresCentral Nervous System (CNS)
![Page 4: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/4.jpg)
StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons
![Page 5: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/5.jpg)
StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons• Spinal cord: 100 million neurons
![Page 6: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/6.jpg)
StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons• Spinal cord: 100 million neuronsPeripheral Nervous System (PNS)
![Page 7: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/7.jpg)
StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons• Spinal cord: 100 million neuronsPeripheral Nervous System (PNS)• Nerves: bundles of 100-1000 axons
![Page 8: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/8.jpg)
StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons• Spinal cord: 100 million neuronsPeripheral Nervous System (PNS)• Nerves: bundles of 100-1000 axons• Ganglia: Small masses of neuron cell bodies
located outside the CNS.
![Page 9: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/9.jpg)
StructuresCentral Nervous System (CNS)• Brain: 100 billion neurons• Spinal cord: 100 million neuronsPeripheral Nervous System (PNS)• Nerves: bundles of 100-1000 axons• Ganglia: Small masses of neuron cell bodies
located outside the CNS. • Sensory receptors: Located in skin, eyes, ears,
nose, and mouth
![Page 10: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/10.jpg)
Functions 1. Sensory input: Receptors detect external and
internal stimuli. This information is carried to the brain via nerves.
![Page 11: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/11.jpg)
Functions 1. Sensory input: Receptors detect external and
internal stimuli. This information is carried to the brain via nerves.
2. Integration: The brain processes and analyzes the sensory information and decides on appropriate responses
![Page 12: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/12.jpg)
Functions 1. Sensory input: Receptors detect external and
internal stimuli. This information is carried to the brain via nerves.
2. Integration: The brain processes and analyzes the sensory information and decides on appropriate responses
3. Motor output: The nervous system causes a response by stimulating effectors (muscles and glands)
![Page 13: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/13.jpg)
Functions 1. Sensory input: Receptors detect external and
internal stimuli. This information is carried to the brain via nerves.
2. Integration: The brain processes and analyzes the sensory information and decides on appropriate responses
3. Motor output: The nervous system causes a response by stimulating effectors (muscles and glands)
Example: You are driving and see a red light (sensory input). Your brain integrates this information (red light means “stop”) and your foot goes for the brake (motor output)
![Page 14: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/14.jpg)
Neurons• Conduct electrical impulses
![Page 15: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/15.jpg)
Neurons• Conduct electrical impulses• Neurons in CNS are amitotic
![Page 16: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/16.jpg)
Neurons• Conduct electrical impulses• Neurons in CNS are amitotic• Three parts:– Cell body: Contains nucleus and organelles
![Page 17: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/17.jpg)
Neurons• Conduct electrical impulses• Neurons in CNS are amitotic• Three parts:– Cell body: Contains nucleus and organelles– Dendrites: Short, highly branched extensions.
Receive input and transfer impulses to the cell body
![Page 18: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/18.jpg)
Neurons• Conduct electrical impulses• Neurons in CNS are amitotic• Three parts:– Cell body: Contains nucleus and organelles– Dendrites: Short, highly branched extensions.
Receive input and transfer impulses to the cell body
– Axon: Only 1 per neuron. Long branch that carries impulses away from cell body. Often covered by a segmented, fatty myelin sheath
![Page 19: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/19.jpg)
• Draw a diagram of a neuron
![Page 20: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/20.jpg)
Types of neuronsType Transmits
impulses:Structure Location
Sensory From sense receptors to CNS
Long dendrites, short axon
Dendrites: PNSCell Body: Ganglia (PNS)Axon: CNS
Motor From CNS to muscles and glands
Short dendrites, long axon
Dendrites and Cell Body: CNSAxon: PNS
Association From sensory neurons to motor neurons
Variable Dendrites, Cell Body, and Axon: CNS
![Page 21: Intro to nervous system](https://reader033.vdocuments.site/reader033/viewer/2022060110/555a91bfd8b42a991b8b4980/html5/thumbnails/21.jpg)
Output (pg 3)
• Draw a sensory neuron and a motor neuron• Label the dendrites, cell body, and axon in
each and say whether each part is located in the CNS or the PNS