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Opthamology > Anatomy > Flashcards

Anatomy Flashcards

(100 cards)

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1
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A

Orbicularis Occuli

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2
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Orbital margin

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3
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Optic canal

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4
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Superior orbital fissure

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5
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Inferior orbital fissure

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6
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Lacrimal groove

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7
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Iris

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8
Q

What is the iris covered with?

A

The cornea

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9
Q

What is the corneoscleral junction also known as?

A

The limbus

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10
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11
Q

What are the three layers of the eye?

A
  1. Outer fibrous layer
  2. Uvea
  3. The retina
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12
Q

Name the two parts of the fibrous layer of the eye and their function

A
  1. The sclera. Protects the eye and acts as an attachment for extraocular muscles
  2. The cornea. Provides 2/3rds of the refractive power
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13
Q

Name the 3 parts of the uvea and their function

A
  1. The iris. Controls pupil diameter
  2. The ciliary body. Controls the iris, the shape of the lens and the secretion of aqueous humour
  3. The choroid. Nutrition and gaseous exchange for the other layers.
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14
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A
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15
Q

What does the opthalmic artery travel through to reach the orbit?

A

The optic canal

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16
Q
A

Superior rectus muscle

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17
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Lateral rectus muscle

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18
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Medial rectus muscle

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19
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Inferior rectus muscle

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20
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Superior oblique muscle

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21
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Inferior oblique

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22
Q
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Trochlea

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23
Q

What numbered cranial nerve is the optic nerve?

A

CN II

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24
Q

What is the area in the eye of most actue vision? Why is this?

A

The fovea centralis in the macula. This is where there is the greatest density of cones.

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25
26
What "end artery" supplies the eye?
The central artery of the retina
27
What four veins does blood from the orbit drain into?
Forehead vein(s) Superior opthalmic vein Facial vein Inferior opthalmic vein
28
What is the only point of entry into/exit out of the reti afor blood vessels and optic nerve axons?
Optic disc
29
Name the three layers of the retina, from posterior to anterior
1. Photoreceptors 2. The ganglion cells 3. The axons of the ganglionc cells
30
Why is the optic disc a "blind spot"?
There are no photoreceptors
31
Where is the light from objects in the right visual field processed?
The left primary visual cortex
32
Where do all the rectus muscles insert into?
The sclera, just posterior to the cornea
33
What nerve gives somatic motor innervation to the lateral rectus muscle?
Abducent nerve (CN VI)
34
What nerve gives somatic motor innervation to the superior oblique muscle?
Trochlear nerve (CN IV)
35
What nerve gives somatic motor innervation ot all of the eye muscles except from the lateral rectus and the superior oblique?
Occulomotor
36
Internal carotid arteries
37
What bony opening do cranial nerves III, IV and V pass through?
Superior orbital fissure
38
What artery lies within the cavernous sinus?
Internal carotid
39
40
What are the purple arrows at the oottom of this picture showing?
41
What nerve supplies - The upper eyelid - The cornea - All of the conjunctava
CN V1 The opthalmic nerve (Opthalmic branch of trigeminal)
42
What nerve supplies - the skn of the lower eyelid - The skin of the maxilla - The skin of the ala of the nose - The skin/mucosa of the upper lip
CN V2 (maxillary nerve)
43
WHat nerve supplies the skin over the mandible and the temporomandibular joint?
CN V3 (Mandibular nerve)
44
Describe the conduction of action potential from the sensory part of CN V1
Action potentials conducted centrally via CN V1 to the trigeminal ganglion then in the trigeminal nerve to the pons
45
Where does CN V1 (opthalmic branch of trigeminal) leave the cranial cavity?
Superior orbital fissure
46
Where does the maxillary nerve leave the cranium?
Foramen rotundum
47
Where does the mandibular branch of the trigeminal nerve leave the cranium?
Foraman ovale
48
What neurotransmitter do presynaptic sympathetic axons release as the synapse, which stimulates the cell body of the post synaptic axon?
Acetylcholine
49
What neurotransmitter do post synaptic sympathetic axons release at the organ to stimulate the organ to respond?
Noradrenaline
50
Describe the course of presynaptic sympathetic axons from the CNS to the eyes.
1. Exit spinal cord at the T1 spinal nerve 2. Ascend with the sympathetic trunk 3. Synapse in the superior cervical sympathetic ganglion
51
Where do post synaptic sympathetic axons enter once they leave the superior sympathetic ganglion?
The internal and external carotid nerves - these are carried alongside the arteries of the same name.
52
53
In the parasympathetic division of the nervous system, where is the ganglion located?
Within the organ
54
What does the postsympatic parasympathetic axon release onto the organ to stimulate it?
Acetylcholine
55
In which cranial nerves do all presynaptic parasympathetic axons leave the CNS?
CN II, VII, IX, X
56
What nerve gives somatic motor innervation ot the levator palpebrae superioris?
Occulomotor nerves
57
Where does the occulomotor nerve connect with the CNS?
The junction between the midbrain and thw pons
58
What nerves supply autonomic axons to conrol the diameter of the iris and the refractive shape of the lens?
Ciliary nerves
59
What nerves form the first part of the afferent limb of the blink reflex?
Long ciliary nerves
60
Describe the vestibulo - ocular reflex
Turns the eyes in the opposite direction tot a head movement to stabilise the gaze
61
Describe the oculocardiac reflex
Reflex bradycardia in response to tension of the extraocular muscles or pressure on the eye
62
When are the pupils dilated?
Dim light, fight and flight, sick patients
63
What branch of the nervous system dilates the pupil?
Sympathetic
64
What do you call a pupil that is enlraged non - physiologically?
Mydriatic
65
What muscle is radially arraged and sits around the internal and extrenla circumfrence of the iris?
Dilator pupillae fibres
66
What muscle is arraged circularly all around the internal circumfrence of the iris?
Sphincter pupillae fibres
67
What is a miotic pupil?
A fixed dilated pupil
68
What are the three componenets of the accomodation reflex?
1. Bilateral pupillary constriction (CN III) 2. Bilateral convergence (medial rotation of both eyes) also CN III 3. Bilateral relaxation of the len. The lens become spherical due to contraction of the ciliary muscles (CN III)
69
70
What are basal tears?
There are there all the time and are importnat in corneal health to clean/nourish and hydrate the avascular cornea. The also contain lysozyme. (An enzyme that cn hydrolyse bacterial cell walls.
71
What are reflex tears?
Extra tears in response to mechanical or chemical stimulation
72
What is the afferent limb of the tear reflex?
CN V1
73
What is the efferent limb of the tear reflex?
CN VII (facial nerve)
74
What nerve supplies the lacrimal gland?
Facial
75
How does the lens act in response to an object jn the distance? How is this brought about?
The lens flattens. This is broght about by relaxation of the ciliary muscle and tightening of the ligament.
76
What needs to happen in order for the ey to focus on something close up?
The ciliary muscle contracts, the ligament relaxes and the lens becomes spherical.
77
Does this image represent near or far vision?
Far
78
Does this image represent near or far vision?
Near
79
Describe the four stage "neurone chain" involved in the pupillary light relfexes
1. Retinal ganglion cells pass vis ipsilateral optic nerve into the opric chiasm and then synapse in the pretectal nucleus in the midbrain. 2. (This is then bilateral) These second neurones are located entirely within the midbrain and connect to the pretectal nucleus to the next synapse in the Edinger Westphal nucleus. 3. Signal then passes from the EX nucleus, via CN III and then its inferior divison to synapse in the ciliary ganglion. 4. Course in the short ciliary nerves to the spincter pulpillae muscles where the response is seen.
80
What is in the Edinger Westphal nucleus?
Cell bodies of the parasympathetic axons of CN III
81
What muscles does the superior divison of CN III supply?
Superior rectus Levator palpebrae superioris
82
What does the inferior divison of CN III supply?
Medial rectus Inferior rectus Inferios oblique
83
What muscles and nerves are involved when looking to the right? (both eyes)
Right eye: Lateral rectus (CN VI) Left eye: Medial rectus (CN III)
84
What muscles and nerves are involved in looking up and to the right?
Right eye: Superior rectus & CN III, Lateral rectus & CN IV Left eye: Inferior oblique & CN III, Medial rectus & CN III
85
What muscles and nerves are involved in looking down and to the right?
Right eye: Inferior rectus & CN III, Lateral rectus & CN VI Left eye: Superior oblique & CN III, Medial rectus & CN III
86
What muscles and nerves are involved in looking to the left?
Right eye: Medial rectus & CN III Left eye: Lateral rectus & CN VI
87
What muscles and nerves are involved in looking up and to the left?
Right eye: Inferior oblique & CN III, Medial rectus & CN III Left eye: Superior oblique & CN III, Lateral rectus and CN VI
88
What muscles and nerves are involved in looking down and to the left?
Right eye: Medial rectus & CN III, Superior oblique a& CN III Left eye: Lateral rectus & CN VI, Inferior rectus and CN III
89
What muscles and nerves are involved in looking up?
Both eyes: Superior rectus, Inferior oblique and CN III
90
What muscles/nerves are involved in looking down?
Both eyes: Inferior rectus & CN III, Superior oblique & CN IV
91
92
What muscle abducts the eyes?
Lateral rectus
93
What muscle adducts the eye?
Medial rectus
94
What muscles elevates the eye from an abducted position?
Superior rectus
95
What muscle depresses the eye from an abducted position?
Inferior rectus
96
What muscle elevates the eye from the adducted position?
Inferior oblique
97
What muscle depresses the eye from an adducted posititon?
Superior oblique
98
What are the structures of the anterior segment of the eyes (from anterior to posterior)?
The cornea Anterior chamber (space between the cornea and the iris which contains aqueous chamber) Iris Lens Ciliary body Posterior chamber (contains the lens and aqueous humour and is located between the iris and vitreous body
99
What does the posterior segment of the eye contin?
Sclera Choroid Retina Vitreous body
100
What is the vitreous body?
Structure containing a clear gel that is 98% water that provides the pressure to hold up the retina supported against the choroid.

Opthamology (7 decks)

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