Sensory System

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Sensory System

• Images for Lab

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Receeptor and Sensory Neuron
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Wavelengths in the visible spectrum to which
receptors respond
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Anatomy of the Eye
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Cells in the retina
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Rods and Cones

• Read about rods and cones at this website.
• http//users.rcn.com/jkimball.ma.ultranet/BiologyP
  ages/V/Vision.html
• The Retina
• Rod Vision
• Cone Vision

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The Retina
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AccommodationThis term refers to the ability
of the lens to contract and relax, focusing light
on the retina.
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The primary colors detected by the
photoreceptors. Different receptors are most
sensitive to these individual wavelengths of
light.
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Stretch Receptor (Muscle Spindle)
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Muscle Spindle

• Proprioceptor
• Located in skeletal muscles near tendons.
• Structure
• Intrafusal fiber, sensory nerve fiber.
• Function
• Muscle stretch causes muscle spindle to stretch,
  sensory impulse to spinal cord, motor reflex to
  muscle leads to relaxation of muscle.
• Stretch reflex.

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Stretch reflex arc
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The Ear
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EAR DRUM
Malleus
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The Cochlea
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Frequency Response of HumansTo Sounds Waves
Notice the range of frequencies and the distance
from the apex of the cochlear where the basilar
membrane is maximally stimulated.
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Frequency Response of Gerbil
Compare the gerbil graph to that of the previous
graph.
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Frequency Response of Elephant
And the elephant! Pretty amazing!
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Section of Cochlea
This image shows a section of cochlea and the
relationship between the Organ of Corti and the
fluid that transmits the vibration of the sound
wave to the hair cells located on the organ of
Corti.
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Organ of Corti
6 Tectorial membrane
7 Hair cells
4 Sensory neuron
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Hair Cell and Sensory Neuron