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**Give 4 causes of Labyrinthitis (question 30)
- Virus (herpes)
- Head Injury (boxers, rugby players)
- Bacterial infection
- An allergy or a reaction to medication
Give 4 causes of Tinnitus (question 30)
- Exposure to noise
- Presence of earwax
- Head injury
- Menieres disease
- Over active thyroid gland
- Anaemia (nerves need good blood supply)
**Give 4 causes of Hearing impairment (question 30)
- Ear canal obstructions
- Ossicle abnormalities
- Ruptured tympanic membrane
- Poor hair cell function
- Infection or noise trauma
- Foetal alcohol syndrome
- Premature birth
- Head injuries:
- can cause hearing loss through damage to the middle ear or auditory nerve
- 'Shaken baby syndrome'
Give 4 causes of Uveitis (question 30)
- Viral infection (e.g. herpes)
- Parasitic infection (e.g. toxoplasmosis)
- Fungal infection (e.g. histoplasmosis)
- Autoimmune disease
- Trauma to the eye
**Give 4 signs & symptoms of Otitis Media (question 31)
- Ear ache
- Mild hearing loss
Give 4 signs & symptoms of Menieres Disease (question 31)
- Comes in bouts:
- Dulled hearing
- Pressure inside ear
**Give 4 signs & symptoms of Blepharitis (question 31)
- Scales & flakes on eyelash base
- Sticky eyelids on awakening
- Recurrent styes
- Dry eye syndrome
- Loss of lashes
- Burning & Itching of eyelid margin
**Give 4 signs & symptoms of Acute Glaucoma (question 31)
- Pain in eyes
- Haloes around lights
- Intense eye pain
- Rapid deterioration of vision
- Redness and watering of eyes
- Sensitivity to bright light
- Haloes around lights
- Nausea & Vomiting
Term: Contains all the different frequencies of sound (question 32)
Term: Thin transparent membrane lining the eyelids & front of the eyeball - protects cornea and front of eye when shut (question 32)
What produces and drains tears (question 32)
When light moves from one substance to another with a different density the light rays bend (bending of light rays) (question 32)
Give a term: The lens can change it's refractive power to project a sharp image on to the retina. When an object is close the ciliary muscle contracts. A reflex action of the eye, in response to focusing on a near object, then looking at a distant object (question 32)
Contraction of the _______________ of the iris contracts the pupils.
Circular muscle fibres
Contraction of the_________________ dilates the pupil.
Radiating muscle fibres
Give the term: Extra-ocular muscles move the eyes in a co-ordinated way under autonomic control. The nearer the object, the greater the eye rotation.
Simultaneous inward movement of both eyes towards each other (think C for Close (question 32)
Give the term: Inner layer of the eye, beginning of visual pathway. Only place where blood vessels can be viewed. Also contains the optic disc and rod and cone cells (question 32)
Give the term: Two images from the two eyes are fused in the cerebrum so that only one image is perceived. (question 32)
The place where the optic nerve exits the eyeball - blind spot. (question 32)
What allows us to see in low light but don't provide colour? (question 32)
Stimulated by bright light & allow us to see colour (question 32)
What is the yellow spot at the exact centre of the retina? (question 32)
A small depression in the centre of the macula lutea which contains only cone cells. It is the area of highest visual acuity. (question 32)
Give the term: When going from dark to light eyes adjust quite quickly (question 32)
Opacity of the lens... (question 32)
Give the term: Perception of odour decreases within a few minutes. Odours seems 80% less powerful after a few minutes of exposure (question 32)
Give the term: the largest taste buds located at the back of the tongue.(question 32)
Give the term: Mushroom shaped and present all over tongue, they contain about 5 taste buds each. (question 32)
Give the term: At the edges of the tongue. Most degenerate in childhood (question 32)
Give the term: Tactile receptors that help the tongue move food in the oral cavity (question 32)
Give the term: Taste buds that are found in elevations on the tongue (question 32)
Give the term. The simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision.
Vergence (convergence or divergence)
Give the term: when both eyes simultaneously rotate away from each other to look at a distant object farther away. (think D for Distant)
What is a Strabismus?
What are auditory ossicles?
smallest bones in the body the transmit sound from air to the fluid filled labyrinth.
Spiraled, conical hollow chamber?
The frequency of sound waves?
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