Eye (terms) for dissection

Sclera

white part surrounding the eye; part of the outer layer of eye made up of dense regular collagenous connective tissue

Cornea (avascular)

translucent (living)/opaque (dead) where light will pass through; part of the outer layer made of dense regular collagenous connective tissue

Iris

contains circular muscle (contract pupil in bright light) and radial muscle (dilate pupil in dim light) ; part of the middle layer and vascular

Ciliary body

contains ciliary processes (produce aqueous humor), ciliary muscle (change the shape of the lens for near and far vision), and suspensory ligaments (holds the lens in position)

Choroid

contains melanin pigment; supplies nutrients and oxygen to the outer retina

Retina

innermost layer of the eye that contains pigmented epithelium, photorecptor rods and cones, and bipolar and ganglion cell neurons

Photoreceptor cones

sensory receptor for special sense vision

Photoreceptor rods

specialized neurons that absorb light to produce visual image

Pupil

a hole in the middle of iris

Lens (avascular)

separates anterior cavity from posterior cavity and focus light onto retina

Optic nerve

ropy structure at the back of eyeball and contains axons of sensory neurons

Optic disc

location where optic nerve leaves eye

Tapetum fibrosum

part of choroid and gives night vision; absent in human

Anterior cavity

Region from cornea to lens

Posterior cavity

Region posterior to lens

Anterior chamber of anterior cavity

Region from cornea to iris

Posterior chamber of anterior cavity

Region from iris to lens

Aqueous humor

A watery clear liquid present in anterior cavity 

Vitreous humor

Transparent , gel -like filler, holds retina in position

Melanin pigment

Found in choroid which is also rich with blood vessels

Macula lutea

High cone density area

Fovea centrails

A pit in macula lutea and area of best visual acuity

2 layers of sensory nerons (Bipolar and ganglion cell neurons)

• Axons of ganglion cells converge to become optic nerve

• Visual information is interpreted in the occipital lobe of cerebrum