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Sensory Mechanism

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Sensory Mechanism Marie ern Five categories Mechanoreceptors - muscle spindle - hair cell in ear Pain receptors (nociceptors) Thermoreceptors Chemoreceptors ... – PowerPoint PPT presentation

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Title: Sensory Mechanism


1
Sensory Mechanism
  • Marie Cerná

2
Five categories
  • Mechanoreceptors - muscle spindle
  • - hair cell in ear
  • Pain receptors (nociceptors)
  • Thermoreceptors
  • Chemoreceptors - gustatory (taste)
  • - olfactory (smell)
  • Electromagnetic receptors
  • - photoreceptors

3
Structure of the eye
4
Retina
Photoreceptors
Neurons
5
Cells of Retina
6
The effect of light on retinal
7
Focusing in the eye
8
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9
Structure of the ear
10
Structure of the ear
11
A cross-sectional view of the cochlea with three
canals
12
Mechanoreceptors
13
Mechanism of hearing
  • Vibrations, caused by sound waves, in
    the tympanic membrane are conducted via 3
    small bones to the oval window and create
    pressure waves in the cochlear fluid -
    perilymph.
  • The waves pass through the vestibular canal to
    the apex of the cochlea, then back toward the
    base of the cochlea via the tympanic
    canal and end on the round window.

Semicircular canals
Cochlea
14
As the basilar membrane vibrates, hair cells
repeatedly brush against the tectorial
membrane. This stimulus causes hair cells
to depolarize.
Perilymph
15
Organs of balance
16
A vestibule contains two chambersthe utricle
and saccule
17
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18
Gustatory chemoreceptors
19
Olfactory chemoreceptors
20
Nociceptors Thermoreceptors
21
Literature
  • Biology, eighth edition,
  • Campbell, Reece
  • Unit seven Animal Form and Function
  • Chapter 50 Sensory and Motor Mechanisms
  • Concept 50.1, 50.2, 50.3, 50.4
  • Pages 1087 1105
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