Nerves and Stimuli

Nerve Cells

Action Potential

Synaptic Junctions

Chemoreceptors

Hamster - taste bud Moth antenna

Mechano- and chemoreceptors

Thermoreceptors

Photoreceptors

Photosensitive cells - Planaria

Compound eye - Arthropods

Nerve cells, stimuli and behaviour

Tail flip response in crayfish

Tail flip response in crayfish

Lateral Giant interneuron (LGI)

a. Correlation between nerve firing and response

LGIStimulating electrode

Recording electrode

Tactile stimulation

b. LGL is sufficent for response

LGIStimulating electrode

Recording electrode

Tactile stimulation

LGIStimulating electrode

Recording electrode

Tactile stimulation

c. Hyperpolarizing nerve

Tail flip

Tail flip

No tail flip

Peripheral Processing of Stimuli

Worm-catching Toads

Central Processing

Optic Tectum of a Toad

Central Pattern Generators (Motor Pattern Generators)