Biology 12 Nervous System THE HUMAN EYE. EYE The eye is an extension of the brain. It helps us take in light information from our surroundings. https://www.yo.

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Presentation transcript:

Biology 12 Nervous System THE HUMAN EYE

EYE The eye is an extension of the brain. It helps us take in light information from our surroundings. utube.com/watc h?v=gvozcv8pS3 c

 Can you see:  The optic nerve bundle?  Spinal cord? EYE BRAIN PROXIMITY PROXIMITY

WHAT ARE THE PARTS OF THE EYE?

Transparent membrane that covers iris and pupil. Focuses light on the retina. CORNEA

Pupil – Black hole in iris where the light enters the eye. Iris - Colored part of the eye that controls the size of the pupil. Sclera - “whites” of the eye that forms outer covering, providing support and attachment for muscles. PUPIL, IRIS, SCLERA

Aqueous Humor - Nutritious fluid between the iris and the cornea. As we age, it breaks down and we begin to see “floaters” Ciliary Muscles - Produces aqueous humor and controls lens shape. Lens - Bends light rays to the back of the eye (retina). Allows us to see objects near and far. AQUEOUS HUMOR, CILIARY MUSCLE, LENS

 Full of light receptors which are sensitive to:  Cones - Colour  Rods- Light levels  Massive blood supply is also needed  Internal membrane RETINA Blind Spot - site of optic nerve connection

Vitreous Humor -Transparent jelly-like fluid that fills the eye and refracts light Optic Nerve - Sends messages picked up by retina to the brain Blind Spot - Area where optic nerve attaches. No retina is located there so information cannot be picked up. No rod or cone cells. VITREOUS HUMOR, BLIND SPOT, OPTIC NERVE

Choroid Layer - Lies between the sclera and the retina it provides the blood supply to the eye. Tapetum Lucidum - Iridescent film under the retina that provides animals with “night vision” CHOROID LAYER, TAPETUM LUCIDUM

CROSS SECTION You must know: 1.Lens 2.Cornea 3.Aqueous humor 4.Pupil 5.Iris 6.Ciliary Muscle 7.Sclera 8.Vitreous Humor 9.Retina 10.Blind Spot 11.Choroid Layer 12.Optic Nerve 13.Tapetum Lucidum Sclera Blind Spot Ciliary Choroid Layer Taptem lucidum

VIDEO & EXTRA LINKS   g&feature=youtu.be g&feature=youtu.be  learn-how-you-eye-works.html learn-how-you-eye-works.html 