Nervous System PNS Human Eye

The Eye https://www.youtube.com/watch?v=gvozcv8pS3c Crash Course https://www.youtube.com/watch?v=o0DYP-u1rNM

Superior oblique Superior rectus Conjunctiva Lateral rectus muscle Optic nerve Inferior rectus Inferior oblique

External Anatomy MUSCLE Turns EYE… Controlled by… 1. SUPERIOR RECTUS Superiorly (up) III Oculomotor 2. INFERIOR RECTUS Inferiorly (down) III 3. LATERAL RECTUS Laterally (to side) VI Abducens 4. MEDIAL RECTUS Medially (towards center) 5. SUPERIOR OBLIQUE Inferiorly & laterally IV Trochlear 6. INFERIOR OBLIQUE Superiorly & laterally

EYE ANATOMY diagram Ciliary body Vitreous humor Ciliary zonule Iris Aqueous humor Lens Cornea Vitreous humor Optic disc (blind spot) Fovea centralis Sclera Choroid Retina

Internal Anatomy 1. Sclera 2. Cornea 3. Lens 4. Iris 5. Ciliary body Eye part Class Notes Textbook Notes 1. Sclera The “white” of eye 2. Cornea Most anterior part of the sclera – your “window” to the world 3. Lens Refracts light 4. Iris Pigmented “diaphragm” of eye 5. Ciliary body Contains muscle that controls the shape of the lens 6. Ciliary zonule Attaches the lens to the ciliary body 7. Aqueous humor Fluid in the anterior segment that provides nutrients to the lens and cornea See pages 282 - 287

8. Vitreous humor 9. Cones & Rods 10. Retina 11. Choroid Eye Part Class Notes Textbook Notes 8. Vitreous humor Gel-like substance that helps reinforce the eyeball 9. Cones & Rods Photoreceptor cells in the retina; CONES = daylight & color / RODS = dim light 10. Retina Layer containing the rods & cones at the back of the eye 11. Choroid Nutritive (vascular) layer of the eye 12. Fovea centralis Area of acute vision; a dimple in the retina where cones are concentrated 13. Optic disk “BLIND SPOT”; Area of retina that lacks photoreceptors 14. Canal of Schlemm Drains the aqueous humor of the eye See pages 282 - 287

INCREDIBLE HUMAN MACHINE SIGHT & HEARING https://www.youtube.com/watch?v=JddHE5l0y68&ebc=ANyPxKrtDu0_n3CrlFOh5qPJaMKJkMaoknWzBMQad736gP-C48Wzm1PqxVbI8hrKaJkWEdxAAxxTgBbZxtyho7uhvFIXqG2mSg

Colorblindness TEST http://colorvisiontesting.com/ishihara.htm What causes colorblindness???

Can you read the numbers in each circle???

Eye disorders Myopia, Hyperopia & Astigmatism Dry eyes Conjuntivitis https://www.youtube.com/watch?v=6YxffFmi4Eo\ Dry eyes https://www.youtube.com/watch?v=7Nu7wWhsRQU Conjuntivitis https://www.youtube.com/watch?v=JLYa2-DymK0 Laser Eye surgery https://www.youtube.com/watch?v=6Q_EKXN3EMg