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Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
Structures of the Sensory System
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Structures of the Sensory System

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3.03 Structures of the Sensory System

3.03 Structures of the Sensory System

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  • The human eye is a tender sphere about 1 inch in diameter. It is protected by the orbital socket of the skull, the eyebrows, eyelids, and eyelashes.
  • Orbit- the eye socketEyelids – the covering of the eyeEyelashes-the hair on our eyelidsConjunctiva- the thin membrane that lines the eyelids and covers part of the eye. It secretes mucus to help lubricate the eyeLacrimal apparatus- gland located above the lateral area of the eye. Duct- corner of the eyes and empties into the nasal cavity. Extrinsic muscles- provide movement to the eyeball
  • Superior- rolls eyeball upwardInferior- rolls eyeball downwardLateral- rolls eyeball laterallyMedial rectus-rolls eyeball mediallySuperior oblique-rolls eyeball on its axis, moves cornea downward and laterallyInferior oblique- rolls eyeball on its axis, moves cornea upward and laterally
  • Sclera- the outer layer ( the whites of the eye). Tough fibrous capsule which maintains the shape of the eye. Cornea- the very front of the eye. It is a clear area. Sometimes referred as the window of the eye. Consists of 5 layers of flat cells arranged much like sheets of plate glass. It contains pain and touch receptors. It is very sensitive to any foreign particles. Choroid – the middle layer of the eye. Contains blood vessels. Pupil- circular opening in front of the choroidIris- colored muscular layer surrounding the pupil. Lens- is located between the anterior and posterior chamber. It is a crystalline structure located behind the iris and pupil.Retina- is the innermost part of the eye. It is located between the posterior chamber and the choroid.
  • Iris may be blue green gray brown or black. The eye color is related to the number and size of melanin pigment cells in the iris. If there is little melanin present, the eyes will be blue because light is more scattered. With increasing quantity of melanin, eye color ranges from green to black. The total absence of melanin results in pink eye color (albino)
  • Macula- Yellow disk in the back of the eyeFovea centralis- where cones are located. Around the fovea is where rods are located Optic disk- located to the side of the fovea. Nerve fibers from the retina gather here to form the nerve. It has neither rods nor cones….there is no vision in this spot “blind spot”.
  • LOOK INTO MY EYES ACTIVITY SHEET
  • The ear is a special sense organ that is especially designed to pick up sound waves and send the impulses to the auditory center of the brain. The auditory center of the brain is located in the temporal area just above the ears.
  • The pinna is the external part of the ear and it collects sound waves and directs them into the auditory canal. Auditory canal is lined with sebaceous glands which secrete wax like substance called cerumen. Cerumen protects the ear. Auditory canal leads to the eardrum or tympanic membrane. Tympanic membrane separates the outer ear from the middle ear.
  • Middle ear is really a cavity in the temporal bone. It connects with the pharynx (throat) by the eustachian tube. The tube serves to equalize the air pressure in the middle ear with the outside atmosphere. There is a chain of three tiny bones (ossicles) is found in the middle ear. Malleous (hammer), incus (anvil), and Stapes (stirrups). They transmit sound waves from the ear drum to the inner ear.
  • The inner ear consists of several membrane lined channels which lie deep in the temporal bone. Cochlea is a spiral shaped passage which contains the cochlear duct. This duct is filled with fluid (perilymph fluid) that vibrates when the sound waves from the stirrup bone strikes against it. Located in the cochlear duct are delicate cells which make up the organ of Corti. These hair like cells pick up vibrations caused by the sound waves against the fluid, and then transmit them through the auditory nerve to the hearing center of the brain. 3 semicircular canals also lie within the inner ear. They also contain liquid (endolymph) and delicate hair like cells which bend when the liquid is sent in motion by head or body movements. These impulses are sent to the cerebellum helping us to maintain our body balance or equilibrium. They have NOTHING to do with our sense of hearing. Vestibule chamber is located between the cochlear canal and the semicircular canals that detect body position.
  • The human nose can detect 10,000 different smells. Smell accounts for 90% of what we think we taste.
  • Nares-the two opening of the noseNasal cilia- “nose hairs”Nasal septum-the cartilage which divides the nose into left and rightOlfactory receptors- located in the nose is a small area about the size of a postage stamp with specialized nerve cells to send signals to the olfactory bulb.Turbinates-bony structures in the nasal cavity
  • The tongue is a mass of muscle tissue which has structures called papillae
  • Located on the papilla are taste buds for sweet sour bitter and salty which are stimulated by the flavors of foods. The receptors in the taste buds send stimuli through 3 cranial nerves to the cerebral cortex for interpretation.
  • Transcript

    • 1. Essential questions What are the structures of the sensory system? 3.03 Remember the structures of the sensory system 2
    • 2. The Senses Eyes  Sight Ears  Hearing Nose  Smell Tongue  Taste Skin  Touch 3.03 Remember the structures of the sensory system 3
    • 3. Eyes 3.03 Remember the structures of the sensory system 4
    • 4. Structures of the eyes External structures  Orbit  Eyelids  Eyelashes  Conjunctiva  Lacrimal apparatus  Extrinsic muscles 3.03 Remember the structures of the sensory system 5
    • 5. Structures of the eyes External structures 3.03 Remember the structures of the sensory system 6
    • 6. Structures of eyes Extrinsic muscles 3.03 Remember the structures of the sensory system 7
    • 7. Eyes Internal structures 3.03 Remember the structures of the sensory system 8
    • 8. 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 system 9
    • 9. Structures of the eyes Internal structures 3.03 Remember the structures of the sensory system 10
    • 10. Structures of the eyes Rods and cones  Rods  Active in dim light  Peripheral vision  Do not perceive color  Cones  Active in bright light  Perceive color 3.03 Remember the structures of the sensory system 11
    • 11. Name the structures…Eyes sclera Ciliary Review body choroid conjunctiva retina cornea iris pupil lens Blood Anterior vessels chamber Optic nerve Optic disc (blind spot) External eye muscle 12 3.03 Remember the structures of the sensory system
    • 12. Ears 3.03 Remember the structures of the sensory system 13
    • 13. Structures of the ears External 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
    • 14. Structures of the ears External ear  Pinna or auricle  Auditory canal or external auditory meatus  Ceruminous glands  Tympanic membrane 3.03 Remember the structures of the sensory system 15
    • 15. Structures of the ears Middle ear  Ossicles  malleus  incus  stapes  Eustachian tube 3.03 Remember the structures of the sensory system 16
    • 16. Structures of the ears Inner ear  Cochlea  Perilymph fluid  Semicircular canals  Endolymph fluid  Vestibule chamber 3.03 Remember the structures of the sensory system 17
    • 17. Name the structures…Ears malleus anvil stapes Semicircular pinna canal Review cochlea Auditory canal Eustachian tube Tympanic membrane 3.03 Remember the structures of the sensory system 18
    • 18. Nose 3.03 Remember the structures of the sensory system 19
    • 19. Structures of the nose Nares Nasal cilia Nasal septum Olfactory receptors Turbinates 3.03 Remember the structures of the sensory system 20
    • 20. Structures of the nose 3.03 Remember the structures of the sensory system 21
    • 21. Structures of the nose Olfactory area 3.03 Remember the structures of the sensory system 22
    • 22. Tongue 3.03 Remember the structures of the sensory system 23
    • 23. Structures of the tongue Taste receptors  Also known as gustatory buds or taste buds 3.03 Remember the structures of the sensory system 24
    • 24. 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 system 25
    • 25. Skin 3.03 Remember the structures of the sensory system 26
    • 26. Structures of the skin Epidermis layer Dermis layer Subcutaneous layer Touch receptors  Tactile corpuscles located in the skin Temperature sensors Pain receptors 3.03 Remember the structures of the sensory system 27
    • 27. Structures of the sensory systemDid 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 28
    • 28. Essential questions What are the structures of the sensory system? The End 3.03 Remember the structures of the sensory system 29

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