Eye Anatomy Lecture Flashcards

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1
Q

Globe

A

Surface of the eyeball proper

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2
Q

Orbit

A

Bony cavity housing the eye

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3
Q

7 bones that comprise the orbit

A

1) lacrimal
2) maxilla
3) frontal
4) zygomatic
5) sphenoid
6) ethmoid
7) palatine

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4
Q

Vision falls within the spectrum of 400nm to 75nm. Anything below 400 nm ____ the cells while anything above 750 nm ____ the cells

A

Kills, doesn’t carry enough energy to cause a photochemical reaction

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5
Q

Medial and lateral in regards to the eye

A

Nasal and temporal

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6
Q

Conjunctiva

A

Clear coating that covers the anterior sclera of the eye and eyelid (continuous so nothing can get trapped behind the eye)

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7
Q

Medial and lateral commissure

A

Skin areas outside the eye where the corners meet

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8
Q

Lacrimal caruncle

A

The red area of the nasalmost portion of the eye

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9
Q

Orbicularis oculi muscle

A

Surrounds the eye allowing for closure of eyelid

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10
Q

Tarsal/meibomian glands

A

Holocrine glands on the tarsal plate that secrete an oily substance to reduce tear evaporation in the eye

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11
Q

Tarsal plate

A

The superior and inferior connective tissue that form the inside of the eyelid

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12
Q

Bulbar vs palpebral conjunctiva

A

Palpebral covers the inside of the eyelid, bulbar covers the sclera

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13
Q

Tear flow pathway

A

Lacrimal gland (upper lateral eye) across eye, into lacrimal sac and then nasal lacrimal duct, then to nose

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14
Q

Superior, inferior, and medial rectus, inferior oblique muscle (action) and innervation

A

Inferior oblique moves the eye up and inward, all innervated by CN III

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15
Q

Lateral rectus muscle innervation

A

CN VI

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16
Q

Superior oblique muscle (action) and innervation

A

Superior oblique moves the eye down and inward, innervated by CN IV

17
Q

Levator pallpebrae superioris muscle function and innervation

A

Functions to lift the eyelid, CN III

18
Q

3 tunics of eyeball and features

A

Tunica fibrosa - sclera and cornea
Tunica vasculosa - choroid, ciliary body and iris
tunica interna - retina and optic nerve

19
Q

Ciliary body

A

Functions to produce aqueous humor that flows from the posterior to anterior chamber through the pupil where it is reabosrbed into canal of schlemm

20
Q

Failure of aqeuous humor to drain into canal of schlemm can lead to what pathology?

21
Q

Components of the forebrain

A

Telencephalon, diencephalon, and retina

22
Q

A complete inability to focus vision could be due to a retinal detachment where?

A

The macula densa

23
Q

Fovea

A

Region of the macula that is most dense with only cones,

24
Q

Blind spot

A

Area of the eye where the optic disk lies (where the optic nerve and vessels exit the posterior face of the eyeball) often filled in by the brain

25
A large cup to disk ratio implies...
...glaucoma or other pathology
26
Miotic eyedrops stimulate what type of innervation
Parasympathetic, pupillary constriction
27
Mydriatic eyedrops stimulate what type of innervation and casue what?
Sympathetic, pupillary dilation
28
Ectopic pupil
When a pupil does not form at the center of the iris
29
The near response
- Constriction of pupil - Contract ciliary muscle and relax suspensory ligaments to relax lens into more convex shape - Convergence of eyes - increased refraction
30
The far response
- Relaxation of pupil - Relax ciliary muscle and contract suspensory ligament to tighten lens into more straight shape - no convergence of eyes - decreased refraction
31
Hyperopia
Farsighted, eyeball too short
32
Myopia
Nearsighted, eyeball too long
33
Rods have ____, cones have ____
rhodopsin, iodopsin
34
Rods mech of action
Produce steady ion flow in dark that causes inhibitory post synaptic potential that produces no signal in the optic nerve, upon light the dark current ceases so excitatory post synaptic potential occurs in the optic nerve
35
Light adaptation is -____ than dark
faster
36
Ambylopia
Lazy eye
37
Visual projection pathway starting with the optic nerve
``` Optic nerve optic chiasm Optic tract Lateral geniculate body Optic radiations Visual cortex ```