Transcript External Anatomy See p.281

Nervous System
PNS
Incredible Human Machine
 SIGHT
 https://www.youtube.com/watch?v=JddHE5l0y68

HEARING (6:09)
 https://www.youtube.com/watch?v=JddHE5l0y68

SMELL (8:28)
 https://www.youtube.com/watch?v=9MDn5Ggyxy
U-
MUSCLE
Turns
EYE…
Controlled
by…
1. SUPERIOR RECTUS
2. INFERIOR RECTUS
Superiorly (up)
III Oculomotor
III
3. LATERAL RECTUS
Laterally (to
side)
VI Abducens
4. MEDIAL RECTUS
Medially
(towards
center)
III
5. SUPERIOR OBLIQUE
Inferiorly &
laterally
IV Trochlear
6. INFERIOR OBLIQUE
Superiorly &
laterally
III
Inferiorly
(down)
Eye part
Class Notes
Textbook Notes
1. Sclera
2. Cornea
The “white” of eye
(:
3. Lens
4. Iris
5. Ciliary body
Refracts light
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
Most anterior part of the sclera
– your “window” to the world
Pigmented “diaphragm” of eye
Contains muscle that controls
the shape of the lens
Eye Part
Class 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
14. Canal of Schlemm
Drains the aqueous humor
of the eye
that lacks photoreceptors
Textbook Notes

http://colorvisiontesting.com/ishihara.htm
What causes colorblindness???
Disorder
Cause
Night blindness
Skip 4 lines
(p. 284)
Color blindness
(p. 284)
Cataracts (p. 286)
Glaucoma (p. 286)
Strabismus (p. 301)
Effect