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Nerves and Stimuli.

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Presentation on theme: "Nerves and Stimuli."— Presentation transcript:

1 Nerves and Stimuli

2 Nerve Cells

3 Action Potential

4 Synaptic Junctions

5 Chemoreceptors Hamster - taste bud Moth antenna

6 Mechano- and chemoreceptors

7 Thermoreceptors

8 Photoreceptors Photosensitive cells - Planaria
Compound eye - Arthropods

9 Nerve cells, stimuli and behaviour
Tail flip response in crayfish

10 Tail flip response in crayfish
Lateral Giant interneuron (LGI)

11 a. Correlation between nerve firing and response
Tail flip Recording electrode LGI Stimulating electrode Tactile stimulation b. LGL is sufficent for response Tail flip Recording electrode LGI Stimulating electrode Tactile stimulation c. Hyperpolarizing nerve Recording electrode No tail flip LGI Stimulating electrode Tactile stimulation

12 Peripheral Processing of Stimuli
Worm-catching Toads

13 Central Processing Optic Tectum of a Toad

14

15

16 Central Pattern Generators (Motor Pattern Generators)

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