Essential questions What are the structures of the sensory system? 3.03 Remember the structures of the sensory system2

The Senses Eyes Eyes Sight Sight Ears Ears Hearing Hearing Nose Nose Smell Smell Tongue Tongue Taste Taste Skin Skin Touch Touch 3.03 Remember the structures of the sensory system3

Eyes 3.03 Remember the structures of the sensory system4

Structures of the eyes External structures External structures Orbit Eyelids Eyelashes Conjunctiva Lacrimal apparatus Extrinsic muscles 3.03 Remember the structures of the sensory system5

Structures of the eyes Sclera : Sclera : the white of the eye Cornea: The window of the eye Cornea: The window of the eye Choroid coat: the middle layer of the eye Choroid coat: the middle layer of the eye Pupil: The circular black opening of the eye Pupil: The circular black opening of the eye Iris: The colored layer of the eye Iris: The colored layer of the eye Lens: The crystalline structure located Lens: The crystalline structure located behind the iris and pupil Aqueous humor: Watery fluid inside the Aqueous humor: Watery fluid inside the anterior chamber of the eye Vitreous humor: Jelly like substance located Vitreous humor: Jelly like substance located in the posterior chamber of the eye Retina: the third layer of the eye Retina: the third layer of the eye Rods: Cells of the eye that are sensitive to dim light Rods: Cells of the eye that are sensitive to dim light Cones: Cells of the eye that are sensitive to bright light and color 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” Optic disc: Nerve fibers from the retinal gather here to form the nerve. “Blind spot” 3.03 Remember the structures of the sensory system6

Structures of eyes Extrinsic muscles : eye muscles Extrinsic muscles : eye muscles located attached to the sclera Superior rectus Superior rectus Inferior rectus Inferior rectus Lateral rectus Lateral rectus Medial rectus Medial rectus Superior oblique Superior oblique Inferior oblique Inferior oblique 3.03 Remember the structures of the sensory system7

Eyes Internal structures Internal structures 3.03 Remember the structures of the sensory system8

Eye Trivia Which 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 system9

Structures of the eyes Internal structures Internal structures 3.03 Remember the structures of the sensory system10

Structures of the eyes Rods and cones Rods 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 system11

Eyes Review Review 3.03 Remember the structures of the sensory system 12

Ears 3.03 Remember the structures of the sensory system13

Structures of the ears External ear External ear Middle ear- Middle ear- Also known as the tympanic cavity Inner ear- Inner ear- Also known as the labyrinth Remember the structures of the sensory system14

Structures of the ears External ear 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 3.03 Remember the structures of the sensory system15

Structures of the ears Middle ear Middle ear Ossicles Ossicles Hammer or malleus Anvil or incus Stirrup or stapes Eustachian tube - Connects the ear cavity with the pharynx Eustachian tube - Connects the ear cavity with the pharynx 3.03 Remember the structures of the sensory system16

Structures of the ears Inner ear Inner ear Cochlea Cochlea Special spiral shaped organ of hearing Semicircular canals 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 Vestibule chamber - houses the inner ear 3.03 Remember the structures of the sensory system17

Ears Review Review 3.03 Remember the structures of the sensory system18

Nose 3.03 Remember the structures of the sensory system19

Structures of the nose Nares Nares Nasal cilia Nasal cilia Nasal septum Nasal septum Olfactory receptors Olfactory receptors Turbinates Turbinates 3.03 Remember the structures of the sensory system20

Structures of the nose 3.03 Remember the structures of the sensory system21

Structures of the nose Olfactory area Olfactory area 3.03 Remember the structures of the sensory system22

Structures of the nose 3.03 Remember the structures of the sensory system23 Discuss the structures of the nose in relation to the olfactory nerve.

Tongue 3.03 Remember the structures of the sensory system24

Structures of the tongue 3.03 Remember the structures of the sensory system25

Structures of the tongue Taste receptors Taste receptors Also known as gustatory buds or taste buds 3.03 Remember the structures of the sensory system26 What type of tissue is the tongue made?

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 3.03 Remember the structures of the sensory system27

Skin 3.03 Remember the structures of the sensory system28

Structures of the skin Epidermis layer Epidermis layer Dermis layer Dermis layer Subcutaneous layer Subcutaneous layer Touch receptors Touch receptors Tactile corpuscles located in the skin Temperature sensors Temperature sensors Pain receptors Pain receptors 3.03 Remember the structures of the sensory system29

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! 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 system30

Essential questions What are the structures of the sensory system? The End 3.03 Remember the structures of the sensory system31