Chapter-6 The Sensory System-- Ophthalmology and Otolaryngology Flashcards
Are there many protective structures around the eye?
Yes, there are many protective structures around the eye that help keep it safe and wet.
What structure does the eye rest on?
The socket, which is made up of seven connecting bones in the skull.
What is another name for the socket?
Orbit
What function(s) do the eyelids perform?
1) The eyelids (blepharo) protects the eyes from dust and other floating particles in the air.
2) The eyelids aid in keeping the eye moist.
Is it important to keep the eye moist/wet?
Yes, for this reason, there are additional structures that help keep the eye moist.
What is the lacrimal gland?
The lacrimal gland is a small gland that sits just above and to the side of the eye. It produces tears that stream across the eye and keep it wet.
The eyes and eyelids are lined within a thin invisible membrane known as?
The conjunctiva
Ocul/o
roots
Def: eye
Ex: oculopathy
ophthalm/o
roots
Def: eye
Ex: ophthalmologists
note: It might sound nitpicky, but ophthalmo has two hs, not one. Many people think the root is OPthalmo but it is actually OPHthalmo.
opt/o *
roots
Def: eye
Ex: optometrist
lacrim/o
root
Def: tear
Ex: lacrimation
Note: often the term lacrimal is used interchangeably for the word tear. Keep in mind that the lacrimal gland and the tear gland refer to the same thing.
dacry/o *
root
Def: tear
Ex: dacryorrhea
Note: Although it isn’t the origin of the term, you may find it easy to remember that dacryo means “tear” because it has the word cry in the middle of it- daCRYo.
-opia *
suffix
Def: vision condition
Ex: hyperopia
-opsia *
suffix
Def: vision condition
Ex: akinetopsia
Notes: Akinetopsia = a + kinet + -opsia = no movement vision condition. It refers to a condition where patients are unable to see objects in motion.
blephar/o *
roots
Def: eyelid
Ex: blepharedema, blepharoplasty
Note: Blepharoplasty = blepharo + plasty = surgical reconstruction of the eyelid.
Also, remember that the ph is pronounced f. The word is blepharoplasty, not bleparoplasty
How many layers in the eye?
3
What does the outermost layer of the eye include?
The sclera and the cornea.
What is the sclera?
The sclera is the white part of the eye– a dense, protective layer, like the hard shell on the outside of the video camera
What is the cornea?
The cornea is a clear surface in the middle of the eye. Like the glass on a video camera, the cornea protects the lens and begins the work of focusing light to the back of the eye.
corne/o
roots
Def: cornea
Ex: corneal transplant
kerat/o *
roots
Def: cornea
Ex: keratitis
Notes: Kerato is a tricky root because it has multiple meanings. In the context of the eye, kerato means “cornea.” In the context of the skin, kerato refers to a horny texture to the skin. What’s the connection? Kerato comes from the Greek word meaning “horn” (think of a rhinoCEROS) and corneo comes from a Latin word meaning “horn” (think of a CORNUcopia, a horn of plenty). Apparently someone thought the cornea of the eye looked like an horn.
conjunctiv/o
roots
Def: conjunctiva
Ex: conjunctivitis
Notes: The conjunctiva is a clear membrane that covers the sclera and lines the eyelids. The root comes from two Latin words, con (with/together) and junct (join). Evidently, someone thought it joined the eye to the rest of the body.
scler/o
roots
Def: sclera (the white of the eye)
Ex scleritis
Notes: Just like kerato, sclera has multiple meanings. In other contexts, sclero means “hard” and can refer to the abnormal hardening of any tissue or organ. In the eye, it refers to the white, tough, and fibrous protective covering of the eye. Words having to do with they eye use sclero in both ways:
phacosclerosis: phaco + scler + osis = an abnormal hardening of the lens
scleromalacia= sclero+ malacia= an abnormal softening of the sclera.
What is the second layer of the eye called?
The choroid. This includes the lens, the iris, and the ciliary muscles.