LESSON 11: SENSES (EYES) Flashcards
(32 cards)
Visual system includes the eyes, accesory structures and sensory neurons
Vision
Prevent perpiration from running down forehead to eyes
Eyebrows
Protect from foreign objects
Eyelids and eyelashes
Rapid opening & closing of eyelids
Blink Reflex
Thin, transparent mucous membrane covering the inner surface of eyelids
Conjunctiva
Consist of lacrimal glands that produces tears
Lacrimal apparatus
Six skeletal muscle that responsible for eyeball movement
Extrinsic eye muscle
Extrinsic Eye Muscles
Superior rectus, inferior rectus, medial rectus, lateral rectus, superior oblique, inferior oblique
A hollow, fluid-filled sphere within orbit
Eyeball
Three tissue layers/tunics
- Fibrous tunic
- Vascular tunic
- Nervous tunic
Outermost layer of eyeball
Fibrous tunic
Firm, white outer layer that helps maintain eye shape
Sclera
Transparent; permits entry of light
Cornea
Middle layer of eyeball; contains blood vessel
Vascular tunic
Consist of vascular network &a many melanin containing pigment cells
Choroid
Contains cillary muscles
Cilliary body
A flexible biconvex, transparent dics
Lens
Colored part of the eye
Iris
An opening where the light passes through
Pupil
Inner most of eyeball
Nervous Tunic
Cover the posterior 5/6 of eye
Retina
Outer; keeps light from reflecting back in eye
Pigmented retina
Inner; contains photoreceptors
Sensory Retina
Sensitive to light and can function in dim light
Rods
