1. Nervous System
PNS
Human Eye

2. The Eye
Crash Course

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

6. 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

7. 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

8. 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

9. 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
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

10. INCREDIBLE HUMAN MACHINE
SIGHT & HEARING

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

12. Can you read the numbers in each circle???

13. Eye disorders Myopia, Hyperopia & Astigmatism Dry eyes Conjuntivitis
Dry eyes
Conjuntivitis
Laser Eye surgery