3.03 remember the structures of the sensory system...structures of the eyes. sclera. the white of...
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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 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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