Special senses: Accessory structures of the eye

Accessory structures of the eye

protect the eyeball, no role in vision

-eyebrows, eyelashes, upper and lower eyelids, conjunctiva, lacrimal apparatus, extrinsic eye muscles

Eyebrows (accessory structures of the eye)

superior to each orbit, act as partial filters. They protect our eyes from sweat and sunlight

Upper and lower eyelids (palpebrae)

Protects our eyes from bright lights and foreign objects. shades our eyes during sleep and lubricates the eyeballs by spreading lubrication around from mucous membranes

Eyelashes

They help protect our eyes from foreign objects, sweat, and sunlight

Conjunctive

Thin mucous membranes covering the inner wall of the eyelid and the anterior eye surface.

It keeps the front surface of the eyelids moist.

Lacrimal apparatus

produces and drains tears

-lacrimal gland

-lacrimal canals

-lacrimal sac

- nasolacrimal duct

Lacrimal gland

produce and drain tears into the eye. (#3 on picture)

Lacrimal sac and lacrimal duct

drains into the eye. (#1 on picture)

nasolacrimal duct

drains into the nasal cavity. (# 5 on picture)

lacrimal canals (canaliculi)

Drain tears from at medial side of the eyes into the lacrimal sac. (#2 on the picture)