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Essential questions
What are the structures of the sensory system?
3.03 Remember the structures of the sensory system 2
The SensesEyes
SightEars
HearingNose
SmellTongue
TasteSkin
Touch3.03 Remember the structures of the sensory system 3
Structures of the eyesExternal structures
OrbitEyelidsEyelashesConjunctivaLacrimal apparatusExtrinsic muscles
3.03 Remember the structures of the sensory system 5
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
3.03 Remember the structures of the sensory system 7
Eye TriviaWhich famous
screen actress was noted for her stunning eyes?
Many people thought her irises were violet in color…
3.03 Remember the structures of the sensory system 9
What gives the
iris color? Related to the
number and size of melanin
pigment cells in the iris
Structures of the eyesRods and cones
Rods Active in dim light Do not perceive color
Cones Active in bright light Perceive color
3.03 Remember the structures of the sensory system 11
Structures of the earsExternal ear
Middle ear- Also known as the tympanic cavity
Inner ear- Also known as the labyrinth.
3.03 Remember the structures of the sensory system 14
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
3.03 Remember the structures of the sensory system 15
Structures of the earsMiddle ear
OssiclesHammer or malleus
Anvil or incus
Stirrup or stapes
Eustachian tube- Connects the ear cavity with the pharynx
3.03 Remember the structures of the sensory system 16
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
3.03 Remember the structures of the sensory system 17
Structures of the noseNaresNasal ciliaNasal septumOlfactory
receptorsTurbinates
3.03 Remember the structures of the sensory system 20
Structures of the nose
3.03 Remember the structures of the sensory system 23
Discuss the structures
of the nose in relation
to the
olfactory nerve.
Structures of the tongueTaste
receptorsAlso known as
gustatory buds or taste buds
3.03 Remember the structures of the sensory system 26
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
3.03 Remember the structures of the sensory system 27
Structures of the skinEpidermis layerDermis layerSubcutaneous
layer
Touch receptorsTactile corpuscles
located in the skin
Temperature sensors
Pain receptors
3.03 Remember the structures of the sensory system 29
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!
3.03 Remember the structures of the sensory system 30