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17 Cards in this Set
- Front
- Back
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7 types of sensory receptors |
Mechanoreceptors (touch, hearing, position)
Chemoreceptors (taste, smell)
Photoreceptors (vision)
Thermoreceptors (heat/cold)
Pain receptors *electroreceptors *magnetoreceptors |
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What is sensory adaptation? |
A change over time in the responsiveness of the sensory system to a constant stimulus |
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Where are the eyes located? |
Orbital cavities |
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What is contained in the orbital cavity? |
Tear ducts, nerves, blood vessels, muscles, and some fatty shock absorbing material. |
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What is the outer layer of the eye and what does it do? |
The sclera. Helps maintain shape The eye muscles attach here At the front is transparent (cornea) |
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What is the middle layer of the eye and what does it do? |
The choroid. Middle layer contains blood vessels and pigment granules to prevent light reflection. |
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What is the retina and what does it do? |
The retina lines the interior and is made up of special light sensitive neutrons. Light is refracted to focus on retina. |
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What are the extrinsic muscles of the eye? |
Superior/inferior rectus (turn eye up/down)
Medial/lateral rectus (turn eye in/out)
Superior/inferior oblique (rotate up/down) |
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What are intrinsic muscles? |
The ciliary muscles that control the contraction of the iris to let light in and focus and image on the retina. |
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What is the iris and what does it do? |
Coloured portion of the eye Controls the amount of light getting into the eye through control of the pupil Contains 2 sets of smooth muscles Radial muscles radiate outward to increase the diameter of the iris. |
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What is the pupil? |
The opening in the iris |
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What is the anterior chamber? |
The front portion of the eye that is filled with aqueous humour. |
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What is the posterior chamber? |
The back part of the eye filled with vitreous humour. |
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What structures are used to focus light on the retina? |
Cornea, lens, and humours |
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What structures protect the eye? |
Eyebrows Eyelids Eyelashes Conjunctiva (attached to upper edge of eyelid to prevent bacteria from entering the brain) Lacrimal glands |
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What is the fovea centralis |
A portion of the eye where there are no rods or cones - special sensitivity allows examination of details. |
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What is the blind spot and why do we have it? |
That place near the fovea where the optic nerve leaves the eye to send messages to the brain Lacks rods and cones therefore no capacity for vision. Missing image is supplied by the other eye. |
