Sensory Reception. How you sense. Sensory Receptors – nerve endings that gather sensory...
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Transcript of Sensory Reception. How you sense. Sensory Receptors – nerve endings that gather sensory...
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Sensory Reception
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How you sense.Sensory Receptors –
nerve endings that gather sensory information
Sensation – when neural impulses arrive at cerebral
cortex
Perception – how cerebral cortex interprets the sensory
information.
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Sensory Adapation
• Large amounts of sensory information is being sent to the brain
• The brain filters out insignificant information this is called SENSORY ADAPATION.
• Example:
– You brain telling you that there is pressure on your feet from the ground.
– Your brain telling you that the room temperature is cool or warm.
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Receptors
● Four types− Photoreceptors –
react to light− Chemoreceptors –
chemical reactions− Mechanoreceptors –
physical contact− Thermoreceptors -
temperature
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Eye Structure
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External Layer
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Eye Protection● Conjunctiva
− membrane lining the inside of eyelids and across the front of the eye. Prevents objects from moving behind the eye.
● Fat Deposits− Cushioning the eye during impacts.
● Sclera− Strong outer membrane. Gives shape to eye, and helps
with accommodation.
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Intermediate Layer
● Choroid – absorbs scatter light, inludes blood vessels (food)
● Iris – regulates amount of light entering
● Pupil – opening of light● Ciliary muscles –
change shape of lens to focus
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● Fat Deposits− a close energy source
● Choroid layer− enriched with blood
vessels. Brings in nutrients and removes wastes.
Nourishment
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Nourishment (cont.)
● Posterior Chamber filled with Vitreous Humour− brings nutrients to the lens.
● Pores in the ciliary muscles− allow nutrients to diffuse from the posterior
to the anterior chamber.
● Anterior Chamber filled with Aqueous Humour− brings nutrients to the cornea and the front
of the lens.
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Internal Layer
● Rods – light receptors
● Cones – color receptors
● Fovea centrailis – high density of cones, provides acute vision
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Other Noteable Stuctures
● Lens – focuses light● Humours -support
eyeball with pressure of fluids
● Optic nerve – transmitter to brain
● Optic disc – blind spot, where nerve connets with eye