Special Senses

Eyebrow

Superior eyelid

Pupil

Iris

Lateral palpebral commissure

Sclera

(covered by ocular conjunctiva)

Inferior eyelid

Eyelashes

Lacrimal caruncle

Medial palpebral commissure

Palpebral fissure

Levator palpebrae superioris muscle

Eyebrow

Orbicularis oculi muscle

Conjunctival fornix

Ocular conjunctiva

Palpebral conjunctiva

Tarsal plate

Eyelashes

Palpebral fissure

Eyelid

Tarsal glands

Orbital fat

Pupil

Lens

Iris

Cornea

Lacrimal gland (orbital part)

Lacrimal gland (palpebral part)

Fibrous tunic

Vascular tunic

Retina

Sclera

Cornea

Iris

Ciliary body

Choroid

Pigmented layer

Neural layer

Optic nerve

Central artery of retina

Central vein of retina

Ora serrata

Ciliary muscle

Ciliary process

Ciliary body

Suspensory ligaments

Limbus

Scleral venous sinus

Lens

Iris

Cornea

Pupil

Anterior chamber

Posterior chamber

Anterior cavity

Posterior cavity

Sclera

Choroid

Retina

Fovea centralis

Optic disc

Pupillary constriction

Bright light

Stimulus?

Sphincter pupillae contracts

(parasympathetic innervation)

Pupillary dilation

Low light

Stimulus?

Dilator pupillae contracts

(sympathetic innervation)

Retina

Sclera

Choroid

Optic disc

Optic nerve

Fovea centralis

Choroid

Rod

Cone

Photoreceptor cells

Horizontal cell

Bipolar cells

Amacrine cell

Ganglion cells

Axons of ganglion cells to optic nerve

Pigmented layer

Neural layer

Retina

Incoming light

Nerve signal response to light through retina

Lens flattened

Suspensory ligaments taut

Ciliary muscles relaxed

Ciliary muscles contracting

(Moves body closer to lens)

Lens thickened, more spherical

Suspensory ligaments relaxed

Lens

Suspensory ligaments

Posterior cavity (contains vitreous humor)

Ciliary processes

Angle

Scleral venous sinus