Eyes Flashcards
1
Q
Orientation of the orbital bases and apices
A
Bases: directed anterolaterally
Apices: directed posteriomedially
2
Q
The thickest layer of the cornea is A. Collagen B. Vitreous C. Aqueous D. Endothelial Cells
A
A
3
Q
. A distinctly red spot on the white of the eye fades to brown after several weeks. The patient has no other symptoms. The long resolution time of the spot is due to which of the following:
A. Poor venous drainage of where the spot is
B. continuing trauma to vessels in conjunctiva/sclera
C. immobility of overlying structure
D. eyeball’s poor vascularity
A
A
4
Q
. What is the cranial nerve for pain in the eye? A. CN II B. CN III C. CN V D. CN VII
A
C
5
Q
What is the most vital consideration for the true ophthalmological emergencies?
A. Extreme eye pain
B. Development of something in cornea and lens
C. Extreme symptoms (excessive bleeding, referred pain)
D. Rapid permanent eye loss
A
D
6
Q
The transparent mucuos membrane that lines the eyelids and the eye ball
A
Conjunctiva
7
Q
Parts of the conjunctiva
A
Palpebral and bulbar conjunctiva
8
Q
Conjunctiva on the eyelids
A
Palpebral conjunctiva
9
Q
Conjunctiva on the eyeball
A
Bulbar conjunctiva
10
Q
The recesses formed by the lines of reflection of the palpebral conjunction onto the eyeball
A
Superior and inferior fornices
11
Q
The gap between the eyelids
A
Palpebral fissure
12
Q
The space bound by the palpebral and bulbar conjunctiva
A
Conjunctival sac
13
Q
The dense bands of connective tissue that form the “skeleton” of the eyelids
A
Superior and inferior tarsi (singular = “tarsus”)
14
Q
Which glands secrete lipids that lubricate the edges of the eyelids and prevents them from sticking together when they close?
A
Tarsal glands
15
Q
Large sebaceous glands associated with the eyelashes
A
Ciliary glands
16
Q
Junctions of the superior and inferior eyelids
A
Medial and lateral palpebral commissures
17
Q
The angles of the eye
A
Medial and lateral canthi
18
Q
Structure connecting the tarsi to the medial margin of the orbit
A
Medial palpebral ligament
19
Q
Structure connecting the tarsi to the lateral margin of the orbit, but does not provide for direct muscle attachment
A
Lateral palpebral ligament
20
Q
You asked a patient to look to his right. Which of the following do you expect to happen?
A. The medial rectus of his left eye contracts
B. The lateral rectus of his left eye contracts
C. The lateral rectus of his right eye relaxes
D. The medial rectus of his right eye contracts
A
A
21
Q
Red eye, painless and nonblinding symptoms are associated with
A. Sclera
B. Conjuctiva
C. Cornea
D. Subconjunctival space
A
D
22
Q
Large objects of similar size to a basketball are prevented from damaging the eyes when they hit the face by which of the following structures?
A. Orbital roof
B. Orbital floor
C. Orbital margin
D. Orbital apex
A
C
23
Q
A patient enters a dark room. Which of the following changes in order to accommodate light?
A. Pupillary aperture
B. Orbital aperture
C. Palpebral aperture
D. None of the above
A
A
24
Q
The tear film is created from the lacrimal gland and structures within this other structure:
A. medial canthus
B. eyelids
C. nasolacrimal gland
D. lacrimal sac
A
B
25
Cone receptors are used for
A. depth
B. distance
C. movement
D. shape
D
26
An upside down object forms what kind of image when it passes through the retina?
A. right side up, unmirrored
B. upside down, unmirrored
C. right side up, mirrored
D. upside down, unmirrored
C
27
What is the vein that drains the eyes?
A. Vortex
B. Central Ciliary Vein
A
28
Function of the tarsal plate
A. Attachment of SR
B. Position of lacrimal glands
C. Protects the eyeball
D. Attachment of Levator Palpebrae
D
29
Which is not a layer of the retina
A. Bowman's Layer
B. External limiting layer
C. Photoreceptor layer
D. Ganglion cell layer
A
30
Area where the lacrimal sac is situated
A. Medial wall of the orbit
B. Frontal Bone
C. Ethmoidal Bone
B
31
Which of the following is involved in the sensory relay in vision?
A. Edinger-Westphal nucleus
B. Otic ganglion
A
32
What is the function of the eyelashes?
A. Protect cornea from excess sunlight
B. Sweep off dust in air in front of eyes
C. Protect eye from sweat from the forehead
D. Marks the posterior boundary of the eyelid
A
33
Which of the following situations DOES NOT seem to indicate a true opthalmologic emergency?
A. Sudden blindness in one eye, no other symptom noted
B. A lab accident involving unknown chemicals exploding and splattering all over the face of the patient
C. Acid thrown at the patient's face by an assailant
D. Patient noticing that he is being blindsided frequently
D
34
Which structure divides the lacrimal gland into superior (orbital) and inferior (palpebral) parts?
Tendon of the levator palpebrae superioris
35
The accessory lacrimal glands are more numerous in the superior eyelid or inferior eyelid?
Superior eyelid
36
Nerve stimulation of production of lacrimal fluid
Paraympathetic impulses from CN VII
37
To where do the excretory ducts of the lacrimal gland open?
Lateral part of superior conjunctival fornix
38
When the cornea becomes dry, the eye blinks. T/F
T
39
DIrection of closing of the eyelids
Lateral to medial
40
The Optha ROD noted that the retina had a healthy yellowish color. He mentally took note that this probably meant an adequate blood supply to the retina. He recalled that the ganglion fiber layers of the retina are supplied by these vessels.
A. opthalmic artery
B. central retinal artery
C. ciliary arterial arcades
D. choriocapillaris
B
41
The optha ROD (resident on duty) then examined the patient’s OD using his opthalmoscope. Looking into the right eye, he observed a round structure from which vascular arcades were entering the lobe. What is this structure?
A. macula
B. optic disc
C. ora serrate
D. central retinal vein
B
42
If you ask the patient to look UP & LEFT (diagonally to the left), which muscle is acting on the LEFT eye?
A. IO
B. SO
C. SR
D. MR
C
43
The patient recalled that as he was hit in the OD, he saw a flash of light even though he was able to close his eyelid. Which of the ff. structures was stimulated producing the flash of light?
A. cornea
B. lens
C. vitreous
D. retina
D
44
Right after he was struck, the patient recalled experiencing a very sharp pain in a point below his
eye along the orbital ridge, which of the following
structures was most likely to be involved?
A. troclear nerve
B. oculomotor nerve
C. infraorbital nerve
D. optic nerve
C
45
Approximated diameter of the eyeball
25mm
46
All anatomical structures within the eyeball have a circular or spherical arrangement. T/F
T
47
The connective tissue layer that surrounds the eyeball to support it within the orbit
Fascial sheath of the eyeball (bulbar fascia or Tenon capsule)
48
This very loose connective tissue layer (a potential space) lies between the fascial sheath and the outer layer of the eyeball
Episcleral space
49
The fibrous layer of the eyeball
Sclera, cornea
50
The vascular layer of the eyeball
Choroid, ciliary body, and iris
51
The inner layer of the eyeball
Retina
52
Two main parts of the retina
Optic and non-optic
53
Function of the fibrous layer of the eyeball
Provides shape and resistance
54
The tough opaque part of the fibrous layer of the eyeball, covering the posterior five sixths of the eyeball
Sclera
55
Part of the eyeball that provided attachment for both the extraocular and the extrinsic muscles of the eye
Sclera
56
The anterior part of the sclera is seen through which transparent structure?
Bulbar conjunctiva
57
"White of the eye"
Sclera
58
Transparent part of the fibrous layer covering the anterior one sixth of the eyeball
Cornea
59
The convexity of the cornea is greater or less than that of the sclera?
Greater
60
The sclera and cornea have different collagen composition and degree of hydration. T/F
T
61
The sclera is completely avascular, while the cornea is relatively avascular. T/F
F
The sclera is RELATIVELY avascular, while the cornea is COMPLETELY avascular.
62
From where does the cornea get its nourishment?
From capillary beds around its periphery and fluids on its external and internal surfaces
63
Fluid on the external surface of the cornea
Lacrimal fluid
64
Fluid on the internal surface of the cornea
Aqueous humor
65
The lacrimal fluid provides the cornea oxygen absorbed from the air. T/F
T
66
Corneal innervation
Opthalmic nerve (V1)
67
The angle formed by the intersecting curvatures of sclera and cornea at the corneoscleral junction
Corneal limbus
68
How wide is the corneoscleral junction?
1 mm
69
Another name for the vascular layer of the eyeball
Uvea, or uveal tract
70
The vascular layer of the eyeball
Choroid, ciliary body, iris
71
The dark reddish brown layer between the sclera and the retina
Choroid
72
Largest part of the vascular layer of the eyeball
Choroid
73
Vascular part that lines most of the sclera
Choroid
74
The large vesssels of the choroid is located internally (near the sclera). T/F
They are located externally (near the sclera).
75
The finest vessels of the choroid
Capillary lamina of the choroid or choriocapillaris
76
Choriocapillaris is found in the innermost part of the choroid, adjacent to which structure?
Avascular light-sensitive layer of the retina
77
The choriocapillarios supply the retina with oxygen and nutrients. T/F
T
78
The choriocapillaris has the highest perfusion rate per gram of tissue of all vascular beds of the body. T/F
T
79
Layer responsible for "red eye" in flash photography
Choroid
80
The choroid attaches firmly to which structure?
Pigment layer of the retina
81
The pigment layer of the retina cannot be stripped from the sclera because it is firmly attached to the choroid. T/F
F
It is firmly attached to the choroid, but can be easily stripped form the sclera.
82
The choroid is continuous anteriorly with which structure?
Ciliary body
83
The ciliary body is posterior to the corneoscleral junction. T/F
T
84
The ciliary body is muscular and avascular. T/F
F
It is muscular and vascular.
85
Which structures does the ciliary body connect?
Choroid and iris
86
Which structure provides attachment for the lens?
Ciliary body
87
The contraction and relaxation of the muscle of the ciliary body controls what?
Thickness of the lens. Therefore, focus of the lens.
88
The folds on the internal surface of the ciliary body
Ciliary processes
89
What do the ciliary processes secrete?
Aqueous humor
90
Which structures secrete aqueous humor?
Ciliary processes
91
Which areas do the aqueous humor fill?
Anterior segment of the eyeball
92
Which structure lies on the anterior surface of the lens?
Iris
93
The thin contractile diaphragm with a central aperture that transmits light
Iris
94
Muscles that control the size of the pupil
Sphincter pupillae and dilator pupillae
95
The sphincter pupillae is radially arranged, while the dilator pupillae is circularly arranged. T/F
F
The sphincter is circular, the dilator is radial.
96
Parasympathetically stimulated involuntary muscle of the pupil
Sphincter pupillae
97
Sympathetically stimulated involuntary muscle of the pupil
Dilator pupillae
98
Muscle that increases size of pupil
Dilator pupillae
99
Muscles that decrease size of pupil
Sphincter pupillae
100
Sympathetic responses usually occur immediately, so the pupil immediately dilates. T/F
F
Sympathetic responses occur immediately, yet it may take up to 20 mins for the pupil to dilate.
101
Paraympathetic responses are usually slower than sympathetic responses yet parasympathetically stimulated papillary constriction is normally instantaneous. T/F
T
102
Part of the retina sensitive to light
Optic part
103
Layers of the optic part of the retina
Neural and pigmented layers
104
Light receptive layer of the optic part of the retina
Neural layer
105
The pigmented layer helps reduce the scattering of the light in the eyeball. T/F
T
106
The non-visual retina is the anterior continuation of what part of the retina?
Pigmented layer
107
The non-visual retina extends over which structure anteriorly and which structure posteiorly?
Anteriorly: ciliary body
Posteriorly: iris
108
Part of the retina over the ciliary body
Ciliary part of the retina
109
Part of the retina over the iris
Iridial part of the retina
110
Posterior part of the retina where light entering the eyeball focuses
Fundus of the eyeball (ocular fundus)
111
The distinctive circular area of the retina where sensory fibers and vessels of the optic nerve enter the eyeball
Optic disc
112
The optic disc has no photoreceptors. T/F
T
113
The optic disc is sensitive to light. T/F
F
Because it has no photoreceptors.
114
The blind spot of the retina
Optic disc
115
When does the macula lutea appear yellow?
When the light used to examine the retina is red-free.
116
Special photoreceptors on the macula lutea
Cones
117
Depression at the center of the macula lutea
Fovea centralis
118
The area for most acute vision
Fovea centralis
119
Diameter of fovea centralis
1.5 mm approximately
120
Center of the fovea centralis
Foveola
121
The foveola does not have the capillary network visible elsewhere deep to the retina. T/F
T
122
Where does the optic part of the retina terminate anteriorly?
Along the ora serrata
123
The irregular posterior border of the ciliary body where the optic part of the retina terminates
Ora serrata
124
The central artery of the retina is from which vessel?
Opthalmic artery
125
The central artery supplies the cones and rods of the retina. T/F
F
It supplies the retina except for the cones and rods.
126
From where do the cones and rods receive nutrients?
Choriocapillaris
127
Venous drainage of the the retina
Central vein of the retina
128
The primary refractory medium of the eyeball
Cornea
129
The cornea focuses an inverted image on what light-sensitive part of the retina?
Optic fundus
130
Boundaries of the anterior chamber of the eye
Anterior: cornea
Posterior: iris/pupil
131
Boundaries of the posterior chamber of the eye
Anterior: iris/pupil
Posterior: lens and ciliary body
132
Which structures do the aqueous humor nurish?
Cornea and lens
133
After passing through the pupil in the anterior chamber, where does the aqueous humor drain?
Scleral venous sinus
134
The aqueous humor is removed by the limbal plexus. T/F
T
135
The lumbal plaxus is a network of scleral veins close to the limbus. T/F
T
136
Into where does the limbal plexus drain?
Vorticose and anterior ciliary veins
137
Where is the lens located?
Posterior to the iris and anterior to the vitreous humor of the vitreaous body
138
The lens is biconcave. T/F
F
It is biconvex.
139
What anchors the capsule of the lens to the ciliary process?
Zonular fibers
140
The lens produces most refraction. T/F
F
It is the cornea that produces mos refraction.
141
The lens fine-tunes the focus of near or distant objects on the retina. T/F
T
142
What is the shape of the isolated unattached lens?
Almost spherical
143
Which structure changes the shape of the lens?
Ciliary muscle of the ciliary body
144
Without nerve stimulation, the diameter of the relaxed ciliary muscle is smaller. T/F
F
It is larger.
145
Less convex lens brings more distant objects in focus. T/F
T
146
Parasympathetic stimulation of the ciliary muscle?
Oculumotor nerve (CN III)
147
Parasympathetic response of the ciliary muscle
Sphincter-like contraction, reducing tension on lens
148
Relaxed lens is for near vision. T/F
T
149
The active process of changing the shape of the lens for near vision
Accommodation
150
The thickness of the lens increases with aging. T/F
T
151
People over 40 have difficulty in near vision. T/F
T
152
Functions of the virtreous humor
Transmits light, holds retina in place and supports lens
153
Where is the vitreous body found?
Posterior to the lens
154
Transparent jelly-like substance in the posterior four-fifths of the eyeball to the lens
Vitreous body
155
The watery fluid in the vitreous body
Vitreous humor
156
Other names for the posterior segment of the eyeball
Postremal or vitreous chamber
157
Extraocular muscles of the orbit
Levator palpebral superioris, the four recti (superior, infereior, medial, lateral), two obliques (superior, inferior)
158
Insertion of the levator palpebral superioris
Superior tarsus and skin of superior eyelid
159
Levator palpebral superioris is antagonistic to which muscle?
Superior half of orbicularis oculi
160
The drooping of the upper eyelid
Ptosis
161
Action of the levator palpebral superioris
Elevates superior eyelid
162
The origin of the four recti muscles
Common tendinous ring (annulus tendineus)
163
Insertion of the four recti muscles
Sclera, just posterior to corneoscleral junction
164
Actions of the superior rectus
Adduction, elevation, medial rotation of eyeball
165
Actions of the inferior rectus
Adduction, depression, lateral rotation of eyeball
166
Actions of the medial rectus
Adduction of the eyeball
167
Actions of the lateral rectus
Abduction of the eyeball
168
Muscles that adduct the eyeball
Superior, inferior, medial rectus muscles
169
Origin of the superior oblique
Body of sphenoid
170
The superior oblique is deep to what muscle?
Superior rectus
171
Insertion of the superior oblique muscle?
Sclera
172
Actions of the superior oblique
Abducts, depresses, medially rotates
173
When does the IR and SR produce only depression and elevation, respectively?
When the line of gaze coincides with the plane of the IR and SR, i.e., when the eyeball is abducted by the LR
174
Action of the superior oblique when acting alone
Medial rotation of the eyeball
175
Insertion of the inferior oblique
Sclera, between lateral rectus and inferior rectus
176
Action of the inferior oblique when acting alone
Lateral rotation of the eyeball
177
Actions of the inferior oblique
Elevates, abducts, laterally rotates eyeball
178
The only muscle to originate from the anterior part of the orbit, immediately lateral to the lacrimal fossa
Inferior oblique
179
Primary lateral rotator of the eyeball
Inferior oblique
180
Primary medial rotator of the eyeball
Superior oblique
181
Which direction should a person's gaze be directed to test the elevation and depression of the rectus muscles?
Lateral
182
Which direction should a person's gaze be directed to test the elevation and depression of the oblique muscles?
Medial
183
No single muscle can act to elevate the pupil directly from the primary position. T/F
T
184
No single muscle can act to depress the pupil directly from the primary position. T/F
T
185
Muscles that depress the eyeball
SO, IR
186
Muscles that elevate the eyeball
SR, IO
187
Adductors of the eyeball
MR, SR, IR
188
Abductors of the eyeball
SO, IO, LR
189
Lateral rotators of the eyeball
IR, IO
190
Medial rotators of the eyeball
SO, SR
191
Muscles that act when gazing to the right
Left MR, right LR
192
Muscles the act when gazing to the left
Right MR, left LR
193
Why is the superior eyelid further elevated out of the line of vision when the gaze is directed superiorly?
Because the superior rectus and the levator palpebral superioris share the same muscles sheath
194
The triangular expansions from the sheaths of the medial and lateral rectus ligaments
Medial and lateral check ligaments
195
To which bones are the check ligaments attached?
Lacrimal and zygomatic
196
Which actions do the check ligaments limit?
Adduction and abduction
197
The hammock-like sling from the blending of the check ligaments with the fascia of the IR and IO
Suspensory ligaments of the eyeball
198
The suspensory ligament of the eyeball is from the fascial sheath of which muscles?
IR, IO
199
Which structures act against the posterior pull on the eyeball produced by the rectus muscles?
Check ligaments, obliques and retrobulbar fat
200
CN II is part of the central nervous system. T/F
T
201
Where do the optic nerves begin?
Lamina cribrosa of the sclera
202
CN II exits the orbit via which structure?
Optic canal
203
Nerves of the orbit and the eyeball
CN II, CN III, CN IV, CN VI
204
Motor innervation of LR
CN VI
205
Motor innervation of SO
CN IV
206
Motor innervation of IO
CN III
207
Motor innervation of MR
CN III
208
Motor innervation of SR
CN III
209
Motor innervation of IR
CN III
210
Muscles innervated by CN IV
SO
211
Muscles innervated by CN VI
LR
212
Muscles innervated by CN III
IO, SR, IR, MR
213
Motor innervation of levator palpebral superioris
CN III
214
The oculomotor nerve divides into superior and inferior division. Which muscles are supplied by each division?
Superior: SR, levator palpebral superioris
Inferior: IR, MR, IO
215
Which nerve carries parasympathetic and sympathetic fibers to ciliary body and iris?
Short ciliary nerves
216
Short and long ciliary nerves are from which cranial nerve?
V1
217
Which nerve carries postsynaptic sympathetic fibers to the dilator pupillae and afferent fibers from the iris and cornea?
Long ciliary nerves
218
The blood supply of the orbit is mainly from which branch of the internal carotid artery and which branch of the external carotid?
Opthalmic artery, from internal carotid
| Infra-orbita artery, from external carotid
219
The central artery of the retina is from which artery?
Opthalmic artery
220
Branches of the opthalmic artery that supply the choroid
Short posterior ciliary arteries
221
Branches of the opthalmic artery that supply the ciliary plexus
Long posterior ciliary arteries and anterior ciliary arteries
222
Venous drainage of the orbit
Superior and inferior opthalmic veins
223
The central vein of the retina enter directly the cavernous sinus. T/F
T
224
The vorticose veins drain into which vessel
Inferior opthalmic vein
225
Vascular structure through which the aqueous humor is returned to the blood circulation
Scleral venous sinus
226
227
228
