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3.03 Remember the structures of the sensory system
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What are the structures of the sensory system?
Essential questions What are the structures of the sensory system? 3.03 Remember the structures of the sensory system
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The Senses Eyes Ears Nose Tongue Skin Sight Hearing Smell Taste Touch
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Eyes 3.03 Remember the structures of the sensory system
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Protection The eye is protected by the orbital socket of the skull, eyelids, the eyebrows and eye lashes The protective membrane over the eye is the conjunctiva When we blink, the eyes are constantly bathed in fluid secreted by the lacrimal glands. The tears contain lysozymes which help combat bacterial infections The eye is made of up 3 layers: Sclera, choroid and retina 3.03 Remember the structures of the sensory system
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Question Name the disorder that is inflammation of the membrane that lines the eye…sometimes called “Pink Eye” 3.03 Remember the structures of the sensory system
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Answer Conjunctivitis
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Sclera The outermost layer The white of the eye
Maintains the shape of the eye and protects the structures within The muscles that move the eye are the extrinsic muscles On the anterior portion of the eyeball it forms the cornea 3.03 Remember the structures of the sensory system
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Question What is known as the window of the eye? A. Iris B. Retina
C. Cornea D. Sclera 3.03 Remember the structures of the sensory system
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Answer Cornea 3.03 Remember the structures of the sensory system
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Choroid The middle layer Contains the iris and the pupil
The iris is the colored portion of the eye The pupil is the opening that allows for light to enter 3.03 Remember the structures of the sensory system
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Question What is the colored portion of the eye? A. Lens B. Retina
C. Iris D. Sclera 3.03 Remember the structures of the sensory system
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Answer Iris 3.03 Remember the structures of the sensory system
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Retina The innermost layer
Contains the nerve endings that join to the optic nerve Contains two types of light sensing receptors-rods and cones Each eye contains millions of receptors: 100 million rods and 3 million cones 3.03 Remember the structures of the sensory system
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Detached Retina Shaken Baby finding
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Diabetic Retinopathy Can be caused by hypertension ( BP ) or Diabetes
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Question What structure contains the optic disc? A. cornea B. lens
C. retina D. sclera 3.03 Remember the structures of the sensory system
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Answer Retina 3.03 Remember the structures of the sensory system
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Glaucoma Increased pressure in the fluid of the eye which interferes with optic nerve function and vision gradually deteriorates 3.03 Remember the structures of the sensory system
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Structures of the eyes Rods and cones Rods Cones Active in dim light
Do not perceive color Cones Active in bright light Perceive color 3.03 Remember the structures of the sensory system
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Question If someone is colorblind what structure is impaired? A. Cones
B. Optic Nerve C. Optoc Disc D. Rods 3.03 Remember the structures of the sensory system
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Question If someone has trouble driving at night what structure is impaired: A. Cones B. Optic Disk C. Rods D. Optic Nerve 3.03 Remember the structures of the sensory system
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Answer Rods Why? 3.03 Remember the structures of the sensory system
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Because…. Rods are active in dim light
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Structures of the eyes External structures Orbit Eyelids Eyelashes
Conjunctiva Lacrimal apparatus Extrinsic muscles 3.03 Remember the structures of the sensory system
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Structures of the eyes External structures
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Structures of eyes Extrinsic muscles
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Eyes Internal structures-Lens focuses light rays on the retina
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Question The disorder that deals with clouding of the lens is?
A. glaucoma B. cataract C. Macular degeneration 3.03 Remember the structures of the sensory system
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Answer Cataract 3.03 Remember the structures of the sensory system
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Macular Degeneration A condition which causes loss of central vision needed for driving and reading 3.03 Remember the structures of the sensory system
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Ears- hearing and balance
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3 divisions of the ears External ear Middle ear Inner ear
Also known as the tympanic cavity Inner ear Also known as the labyrinth 3.03 Remember the structures of the sensory system
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Structures of the ears External ear Pinna or auricle-part we see
Auditory canal or external auditory meatus-middle ear Ceruminous glands Tympanic membrane-vibrates with sound waves 3.03 Remember the structures of the sensory system
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Structures of the ears Middle ear Ossicles-3 tiny bones
Hammer or malleus Anvil or incus Stirrup or stapes Eustachian tube- 3.03 Remember the structures of the sensory system
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Question Which structure is part of the middle ear?
A. tympanic membrane B. semicircular canal C. incus D. auditory canal 3.03 Remember the structures of the sensory system
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Answer Incus 3.03 Remember the structures of the sensory system
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Disorders External otitis Otitis media Otosclerosis Meniere’s disease
Tinnitus Presbycusis Conductive hearing loss-Ear wax Sensorineural hearing loss 3.03 Remember the structures of the sensory system
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Question Mary has an ear clog impacted with ear wax. Which sensory disorder does she have making it hard for her to hear? A. Tinnitus B. Vertigo C. Sensoineural Hearling loss D. Conductive hearing loss 3.03 Remember the structures of the sensory system
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Answer Conductive Hearing Loss-Why?
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….because The ear wax is not allowing the sound waves to enter the ear drum 3.03 Remember the structures of the sensory system
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Question Owen has a cold and is pulling at his ears. He has a fever and fluid draining from his right ear. Which sensory disorder is he experiencing? A. Tinnitus B. Vertigo C. Meniere’s Disease D. Otitis Media 3.03 Remember the structures of the sensory system
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Answer Otitis Media OM 3.03 Remember the structures of the sensory system
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Structures of the ears Inner ear Cochlea Semicircular canals
Perilymph fluid Semicircular canals Endolymph fluid Vestibule chamber 3.03 Remember the structures of the sensory system
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Question A construction worker does not wear appropriate hearing protection and is complaining of ringing in his ear. Which sensory order is he experiencing? A. Tinnitus B. Vertigo C. Sensoineural Hearling loss D. Conductive hearing loss 3.03 Remember the structures of the sensory system
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Answer Tinnitus 3.03 Remember the structures of the sensory system
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Nose 3.03 Remember the structures of the sensory system
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Structures of the nose Nares Nasal cilia Nasal septum
Olfactory receptors Turbinates 3.03 Remember the structures of the sensory system
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Structures of the nose 3.03 Remember the structures of the sensory system
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Structures of the nose Olfactory area
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Disorders of the Nose Deviated nasal septum Nasal polyps Rhinitis
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Question Sasha has hayfever and complains of constant nasal drainage. What is her medical conditon? A. Deviated nasal septum B. Nasal polyps C. Rhinitis 3.03 Remember the structures of the sensory system
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Answer Rhinorrhea 3.03 Remember the structures of the sensory system
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Tongue 3.03 Remember the structures of the sensory system
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Thrush- yeast and can be an opportunistic infection
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Strawberry Tongue A four-year-old develops a 103 degree fever and a rash over her body. Her throat is bright red. In fact, so is her mouth, even her tongue. Not the usual pink. Bright red. (strep) Glossitis-inflammation 3.03 Remember the structures of the sensory system
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Structures of the tongue
Taste receptors Also known as gustatory buds or taste buds or PAPILLA-medical term 3.03 Remember the structures of the sensory system
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Question What is the medical term for your taste buds? A. cilia
B. alveoli C. papilla D. pinna 3.03 Remember the structures of the sensory system
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Answer papilla 3.03 Remember the structures of the sensory system
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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 3.03 Remember the structures of the sensory system
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Question Omari had an ear infection and his doctor gave him antibiotics. Now he has white patches on his tongue. What sensory disorder is he experiencing? A. Strawberry tongue B. Glossitis C. Glossectomy D. Thrush 3.03 Remember the structures of the sensory system
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Answer Thrush 3.03 Remember the structures of the sensory system
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Skin 3.03 Remember the structures of the sensory system
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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 3.03 Remember the structures of the sensory system
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Phantom Leg Pain 3.03 Remember the structures of the sensory system
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Question Terry lost his right leg during a road side bomb. Even though his surgeons removed his leg, his brain still tells him that his foot is cramping. This is an example of ? A. dermal pain B. psoriasis C. urticaria D. phantom pain 3.03 Remember the structures of the sensory system
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Answer Phantom pain 3.03 Remember the structures of the sensory system
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What are the structures of the sensory system?
Essential questions What are the structures of the sensory system? The End 3.03 Remember the structures of the sensory system
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