Biology 201Dr. Edwin DeMont

St. Francis Xavier University

Chapter 24Communication I: Nervous and

Sensory Systems

Part 2

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Sensory Reception

The human ear

Biology 403 – Physiology of Sensations (Dr. Beye)

Inner ear includes the semicircular canal, which is involved in equilibrium and the cochlea, which is

involved in hearing.

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Sensory Reception

The sense of equilibrium

Cilia of receptor hairs bend and initiates a generator

potential

St. Francis Xavier University

Sensory Reception

The fish inner ear1. Sound waves enter the mouth

2. Transmitted to gas in the swim bladder

3. Vibrates at corresponding amplitudes and frequencies

as the incoming sound

4. Weberian ossicles vibrate

5. Vibrations move forward to inner ear

6. Response initiated – example fast start

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Sensory Reception

Demonstration of a fast start in a fishMy computer

apps on ‘caesar’ (S:)BiomechanicsPrograms

FastStart Select Image Series Accept Settings Step >

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Neural Network

Fast start in fish: Mauthner CellsIm

age

sour

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