Essential questions

What are the structures of the sensory system?

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The Senses Eyes Sight

Ears Hearing

Nose Smell

Tongue Taste

Skin Touch

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Eyes

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Structures of the eyes External structures

Orbit

Eyelids

Eyelashes

Conjunctiva

Lacrimal apparatus

Extrinsic muscles

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Structures of the eyes Sclera: the white of the eye

Cornea: The window of the eye

Choroid coat: the middle layer of the eye

Pupil: The circular black opening of the eye

Iris: The colored layer of the eye

Lens: The crystalline structure located

behind the iris and pupil

Aqueous humor: Watery fluid inside the

anterior chamber of the eye

Vitreous humor: Jelly like substance located

in the posterior chamber of the eye

Retina: the third layer of the eye

Rods: Cells of the eye that are sensitive to dim light

Cones: Cells of the eye that are sensitive to bright light and color

Optic disc: Nerve fibers from the retinal gather here to form the nerve. “Blind spot”

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Structures of eyes Extrinsic muscles: eye muscles

located attached to the sclera

Superior rectus

Inferior rectus

Lateral rectus

Medial rectus

Superior oblique

Inferior oblique

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Eyes Internal structures

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Eye Trivia Which famous screen

actress was noted for her stunning eyes?

Many people thought her irises were violet in color…

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Structures of the eyes Internal structures

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Structures of the eyes Rods and cones

Rods

Active in dim light

Do not perceive color

Cones

Active in bright light

Perceive color

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Eyes Review

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Name the structures…

Ears

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Structures of the ears External ear

Middle ear- Also

known as the tympanic cavity

Inner ear- Also known as the labyrinth.

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Structures of the ears External ear Pinna- the outer

ear. Collects sound waves

Auditory canal or external auditory meatus

Ceruminous glands- Produce ear wax

Tympanic membrane- the eardrum. Separates the outer and middle ear

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Structures of the ears Middle ear

Ossicles

Hammer or malleus

Anvil or incus

Stirrup or stapes

Eustachian tube- Connects

the ear cavity with the pharynx

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Structures of the ears Inner ear Cochlea

Special spiral shaped organ of hearing

Semicircular canals Contain a liquid and

delicate hair like cells that bend when the liquid is set in motion by the head or body movements

Vestibule chamber- houses the inner ear

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Ears Review

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Name the structures…

Nose

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Structures of the nose Nares

Nasal cilia

Nasal septum

Olfactory receptors

Turbinates

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Structures of the nose

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Structures of the nose Olfactory area

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Structures of the nose

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Tongue

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Structures of the tongue

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Structures of the tongue Taste receptors

Also known as gustatory buds or taste buds

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Trivia Tongue Did you know…

Taste is the weakest of the five senses

We have almost 10,000 taste buds inside our mouths; even on the roofs of our mouths

Everyone’s tongue print is different similar to fingerprints

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Skin

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Structures of the skin Epidermis layer

Dermis layer

Subcutaneous layer

Touch receptors

Tactile corpuscles located in the skin

Temperature sensors

Pain receptors

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Structures of the sensory system

Did you know…..

Our eyes are always the same size from birth, but our nose and ears never stop growing!

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Essential questions

What are the structures of the sensory system?

The End

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