The Sensory System Eye and

EarMawu Ogo

Human Eye Information

The eyeball is an organ that produce an

external images through a nervous system

called the optic nerve to the brain.

The brain then translate the image and

show us the same image that came from

the optic nerve.

There are many structures that are

associated to the eyeball which include eye

muscles, eyelids, conjunctiva, and lacrimal

apparatus.

How the eyes work?

The coordination of muscles in the external

eye occurs making both your eyes move

together.

The correct amount of light is shown by the

pupil.

The focus on the light is shown to the retina

by the lenses.

Structures of the Eye

The eyelids are over the eye that protect

our eye from particles , injury from the sun

or even intense light and trauma. On the

edge of the eyelid are eyelashes which

protect the eye from any particles.

Conjunctiva is an eye mucous membrane

which protect the eye by keeping the

eyeball into the socket.

Eye Structure

The sclera is the white posterior section in the eye that helps support the eyeball.

The cornea is transparent, lacks blood vessels and bends or refracts light rays as they enter the eye

The Ciliary Body is anterior and contains the ciliary muscles used to focus the eye

The ciliary body adapt to change the shape of the lens in a process called accommodation

The vascular layer of blood vessels which contain a thin posterior membrane is called the choroid

Structures of the Eye

Continue….Lacrimal Apparatus- is a gland found in

the outer corner of the eyelid that produce

the tears we cry.

The purpose of tears is to wash and

lubricate the anterior layer of the eyeball.

The Lacrimal duct then collects and direct

your tears into the nasolacrimal duct.

The duct the drains the tears into the nasal

cavity.

Ear Structure

The Ear is an organ that detects

sound, which aid the body in balance

and position.

There are three structures of the ear

called the outer, middle and inner ear.

External Ear

The external ear consist of auricle

which is also called the pinna. It is a

funnel-like structure that lead through

the temporal bones of the skull.

External auditory meatus consist of a

gland that secretes wax.

Middle Ear

The middle ear are connected to the top of pharynx through the Eustachian tube which helps equalize the ear pressure.

Middle ear consist of the tympanic cavity where the membrane is located and also the ossicles .

These structures also include the

Malleus (hammer)

Incus (anvil)

Stapes (stirrup)

Internal Ear

Cochlea is snail-shaped that contains

the organ that we use to hear. The

cochlea connects to the oval window in

the middle ear.

Membranous Labyrinth are receptors

that sense equilibrium and hearing

,where fluid filled tubes and chambers

are located.

Semicircular canal and vestibule

contain receptors and endolymphs that

help our body maintain equilibrium.

Internal Ear Continue….

Perilymph – a fluid that is located

within the cochlea found in the inner

ear.

Osseous labyrinth is a rigid, bony

outer wall that is located within the

inner ear.

Suffixes of the Eye and Ear

-metrist specialist in measuring -opia vision condition-opsia -- vision condition-tropia -- turned condition-scopy-- visual examination-graphy-- process of recording-metry-- process of measuring -otia-- ear condition-acusis-- hearing-cusis--hearing

REFERENCES

http://ghaziabad.all.biz/betamethasone-n-eye-ear-drops-g63292

http://quizlet.com/2955131/medical-terminology-ear-flash-cards/

http://quizlet.com/2955131/medical-terminology-ear-flash-cards/

http://en.wikipedia.org/wiki/Ear

http://myeyescare.com/

http://creepypasta.wikia.com/wiki/File:Hand-Eye-Coordination-by-Liam-York.jpg