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Related Flashcards
Cards In This Set
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What are the special senses?
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Vision, smell, taste, hearing, and touch.
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What are the special sensory receptors?
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They are distinct receptor cells. Confined to the head region, highly localized...housed within complex sensory organs (eyes and ears) or in distinct epithelial structures (taste buds and olfactory epithelium).
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What is the dominant sense?
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Vision: some 70% of all the sensory receptors are in the eyes and nearly half of the cerebral cortex is involved in some aspect of visual processing.
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What are the accessory structures of the eye?
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Eyebrows, eyelids, conjunctiva, lacrimal apparatus, and entrinsic eye muscles.
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What are eyebrows and what are their function?
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Short, course hairs that overlie the supraorbital margins of the skull.
Function: shading from sunlight and a barrier to keep perspiration out of the eyes. |
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What are eyelids and what are their function?
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Eyelids are thin, skin-covered folds (separate from the eye slit) and meet at a medial and lateral and angle (medial and lateral commissures).
Function: protection and rehydrate the eyeball |
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What happens when you blink?
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Accessory structures secret oil, mucus, and saline solution to clean and protect the eye surface as it moistens and lubricates it.
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What are eyelashes and their function?
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Hairs that grow at the edge of each eyelid.
Function: protect the eye from debris and play an important part of the blinking reflex. |
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Where are the tarsal glands and what are their function?
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Embedded in the tarsl plate (located in the upper and lower lids) and their ducts open at the eyelid edge just posterior to the eyelashes.
Function: Produce an oily substance that lubricates the eyelids & eyes and prevents the eyelids from sticking together. |
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What is the difference in an infected tarsal gland and infected smaller gland of the eye?
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Tarsal gland = unsightly cyst called a Chalazion (meaning swelling)
Smaller gland = sty (inflammation) |
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What is the conjunctiva and what is it's function?
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(Meaning "joined together") It is a transparent mucous membrane that lines the eyelids and the anterior surface of the eyeball.
Function: helps lubricate the eye by producing mucus and tears. It also helps with the immune surveillance and helps to prevent the entrance of microbes into the eye. |
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What is the bulbar conjunctiva?
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The very thin covering over the white part of the eye.
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What is the conjunctival sac?
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The area underneath the bottom eyelid that people pull down to put in contacts or eye medicine.
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What is the lacrimal apparatus?
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Consists of the lacrimal gland and the ducts that drain lacrimal secretions into the nasal cavity.
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Where are the lacrimal glands and what are their function?
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They lie in the orbit above the lateral end of the eyes and they continually release a dilute saline solution called lacrimal secretion (tears).
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