3.03 Remember the structures of the sensory system

Essential questions

What are the structures of the sensory system?

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The SensesEyes

SightEars

HearingNose

SmellTongue

TasteSkin

Touch3.03 Remember the structures of the sensory system 3

Eyes

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Structures of the eyesExternal structures

OrbitEyelidsEyelashesConjunctivaLacrimal apparatusExtrinsic 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 locatedin 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”3.03 Remember the structures of the sensory system 6

Structures of eyesExtrinsic muscles: eye muscles

located attached to the sclera

Superior rectusInferior rectusLateral rectusMedial rectusSuperior obliqueInferior oblique

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EyesInternal structures

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Eye TriviaWhich famous

screen actress was noted for her stunning eyes?

Many people thought her irises were violet in color…

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What gives the

iris color? Related to the

number and size of melanin

pigment cells in the iris

Structures of the eyesInternal structures

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Structures of the eyesRods and cones

Rods Active in dim light Do not perceive color

Cones Active in bright light Perceive color

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EyesRevie

w

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Name the structures…

Ears

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Structures of the earsExternal ear

Middle ear- Also known as the tympanic cavity

Inner ear- Also known as the labyrinth.

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Structures of the earsExternal 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 earsMiddle ear

OssiclesHammer or malleus

Anvil or incus

Stirrup or stapes

Eustachian tube- Connects the ear cavity with the pharynx

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Structures of the earsInner 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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EarsReview

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Name the structures…

Nose

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Structures of the noseNaresNasal ciliaNasal septumOlfactory

receptorsTurbinates

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Structures of the nose

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Structures of the noseOlfactory area

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Structures of the nose

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Discuss the structures

of the nose in relation

to the

olfactory nerve.

Tongue

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Structures of the tongue

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Structures of the tongueTaste

receptorsAlso known as

gustatory buds or taste buds

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What type of

tissue is

the tongue

made?

Trivia TongueDid you know…

Taste is the weakest of the five sensesWe have almost 10,000 taste buds inside our

mouths; even on the roofs of our mouthsEveryone’s tongue print is different similar to

fingerprints

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Skin

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Structures of the skinEpidermis layerDermis layerSubcutaneous

layer

Touch receptorsTactile 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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