chapter 14 the human eye structure and function of the eye (concept map) 3 july 2015
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Chapter 14 The Human EyeStructure and Function of the Eye (Concept Map)April 19, 2023
Vertical Section of The Human Eye
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Attaches lens to ciliary body
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suspensory ligament
Vertical Section of The Human Eye
Controls amount of light enteringthe eye
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iris
suspensory ligament
Vertical Section of The Human Eye
Refracts light rays;keeps eyeball firm
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aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
Allows light to enter the eye
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pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
Refracts light rays into pupil
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cornea
pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
lens
Focuses light rays onto retina
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cornea
pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
ciliary body
Contains ciliary muscles which control curvature or thickness of the lens
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lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
viteroushumour
Refracts light rays;keeps eyeball firm
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ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
Controls movement of eyeball
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viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
rectusmuscles
Vertical Section of The Human Eye
Protects against mechanical injury
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viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
sclera
rectusmuscles
Vertical Section of The Human Eye
Pigmented black toprevent internal reflection of light; blood vessels bring oxygen and nutrients to the eyeball
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viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
choroid
sclera
rectusmuscles
Vertical Section of The Human Eye
Region where images are sharply focused
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viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
fovea(yellow spot)
choroid
sclera
rectusmuscles
Vertical Section of The Human Eye
Transmit nerve impulsesfrom eye to brain
optic nerve
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fovea(yellow spot)
choroid
sclera
rectusmuscles
viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
Vertical Section of The Human Eye
Region over optic nerve; no photoreceptors, so insensitive to light
blind spot
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viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
optic nerve
fovea(yellow spot)
choroid
sclera
rectusmuscles
Vertical Section of The Human Eye
Light-sensitive layer containingcones responsible for colour vision in bright light and rods responsible for vision in dim light
retina
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viteroushumour
ciliary body
lens
cornea
pupil
aqueoushumour
iris
suspensory ligament
blind spot
optic nerve
fovea(yellow spot)
choroid
sclera
rectusmuscles
Vertical Section of The Human Eye
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Vertical Section of The Human Eye
Pupil Reflex
A reflex action in which the pupil changes size as a result of changes in light intensity.
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Vertical Section of The Human Eye
Pupil Reflex
In bright light
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In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
Vertical Section of The Human Eye
Pupil Reflex
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Vertical Section of The Human Eye
Pupil Reflex
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
In dim light
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In dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye
Vertical Section of The Human Eye
Pupil Reflex
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
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Vertical Section of The Human Eye
Pupil Reflex Focusing
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
The adjustment of the lens of the eye so that clear images of objects at different distances are formed on the retina.
In dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye
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Vertical Section of The Human Eye
Pupil Reflex Focusing
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
Distant object (7 metres or more)
In dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye
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Vertical Section of The Human Eye
Pupil Reflex Focusing
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
Distant object (7 metres or more)
• Ciliary muscles relax• Suspensory ligament become taut• Lens becomes thinner and less convex
In dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye
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Vertical Section of The Human Eye
Pupil Reflex Focusing
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
Distant object (7 metres or more)
• Ciliary muscles relax• Suspensory ligament become taut• Lens becomes thinner and less convex
Near objectIn dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye
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Distant object (7 metres or more)
• Ciliary muscles relax• Suspensory ligament become taut• Lens becomes thinner and less convex
Near object• Ciliary muscles contract• Suspensory ligaments slacken• Lens becomes thicker and more convex
Vertical Section of The Human Eye
Pupil Reflex Focusing
In bright light• Circular muscles in iris contract.• Radial muscles relax.• Pupil becomes smaller, hence less light enters the eye
In dim light• Radial muscles in iris contract .• Circular muscles in iris relax.• Pupil enlarges, hence more light enters the eye