Lecture 15: Vision Flashcards
What neurotransmitter does photoreceptors secrete?
Glutamate
The amount of light reaching the retina is controlled by the what
IRIS
The Ciliary muscle helps to what
Control the shape of the Lens
What are the 4 layers of protection of the eye
Eyeball
Eyelid
Eyelashes
Tears
Describe the Iris
Controls amount of light that can enter by using 2 set of smooth muscles
Circular = constricts Radical = Dilates
Describe the Pupil
opening where light enters
Describe the Lens
Focus light on the retina (Fovea
Describe the Sclera
Fluid filled spherical structure
Visible white layer of the eye
tough layer of connective tissue
Describe the Cornea
Fluid filled spherical structure
Anterior
Transparent layer that lets light rays through
Describe the Choroid
Fluid filled spherical structure
Contains blood vessels nourishing retina
Contains melanin under retina
Underneath Sclera
Describe the retina
Fluid filled spherical structure
Filled with Rods and cones
Axons of visual nerve fibers
Outer pigment cells
Describe the Posterior cavity
Fluid filled
Between lens and retina
Gelantinous viterious humor
Describe the anterior cavity
Fluid Filled
Between cornea and lens
Aqueous humor
What two things dilate or constrict the pupils
Circular/ radical muscles
Actions of the PNS/SNS
The Lens bends ____
Light rays