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BDS2.5 Anatomy > Eye - muscles > Flashcards

Eye - muscles Flashcards

1
Q
A

Trochlea nerve supplies the SO

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2
Q

What are the 3 nerves of the extrinsic ocular nerves?

A

3 4 6

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3
Q

What is the pneumonic for muscles and cranial nerves?

A

SO 4
LR 6
everything else 3

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4
Q

What innervation is the 3rd cranial nerve?

A

Occulomotor

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5
Q

What CN carry parasympathetic?

A

3 7 9 10

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6
Q

What nerve innervates glands?

A

CN 7

Makes things secrete

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7
Q

What type innervation is the 4th cranial nerve?

A

Autonomic

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8
Q

What is the role of the optic nerve?

A

Carries visual impulses from the eyeball. Leaves orbit through the optic foramen

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9
Q

What way does the mesial recuts muscle help you move the eye?

A

Medially

Towards nose

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10
Q

What way does the lateral rectus allow the ye to move?

A

Laterally

Away from nose

Abduction

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11
Q

What muscle allow the eye to elevate?

A

Superior rectus

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12
Q

What muscle allows the eye to look down? (Depression)

A

Inferior rectus

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13
Q

What is the action of the superior oblique?

A

Intorsion

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14
Q

What does the inferior oblique muscle allow?

A

Extortion

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15
Q

When the superior oblique causes intosion, what is a consequence of this?

A

Depression and abduction

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16
Q

What other movement does the inferior oblique muscle cause?

A

Elevation

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17
Q

What does the abducens nerve innervate?

A

Lateral rectus

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18
Q

What does the trochlear nerve innervate?

A

Superior oblique

19
Q

What muscles does the oculomotor nerve innervate?

A

Superior oblique and lateral rectus

20
Q

What are the signs of CNIII n palsy?

A

Ptosis, and eye is down and out, pupil may be non reactive

21
Q

What are the signs of CNIV palsy?

A

Eye shoots up when looking towards the nose

22
Q

What is the sign of CNVI palsy?

A

Eye cannot abduct

23
Q

Why would the reasons for CNIII palsy?

A

Diabetes - palsy and pupil find
Aneurism in brain - palsy and pupil involved

24
Q

What is the normal pupil reaction to light?

A

Constriction

25
Q

What is the significance of a third cranial nerve palsy and pupil involvement?

A

Aponeurosis

26
Q

What is the fovea?

A

a small depression at the center of the retina. It provides the sharpest vision in the human eye

27
Q
A

A = superior oblique
B = medial rectus
C = inferior oblique
D = inferior rectus
E = lateral rectus
F = superior rectus

28
Q

What do the intrinsic eye muscles control?

A

Control pupil diameter

29
Q

What is the visual pathway?

A

Optic nerve
Optic chiasm
Optic tract
To the thalamus and synapses
Optic radiation

30
Q

What fibres cross over at the chiasm?

A

Nasal

31
Q

What are the 2 categories of ocular muscles?

A

Intrinsic and extrinsic

32
Q

What is the role of the intrinsic muscles of the eye?

A

Control pupil diameter and helps alter lens curvature to enable us to see near objects

33
Q

What is the role of the extrinsic muscles of the eye?

A

Also called extraoccular muscles

Move the eye

34
Q

What muscle is responsible for constricting the pupil?

A

constrictor pupillae by parasympathetic (CNIII)

35
Q

What muscle allows the pupil to dilate?

A

Dilator pupillae by sympathetic (plexus around blood vessels)

36
Q

What happens to the eye when you want to focus on near object?

A

Ciliaris muscles for focussing on near objects

When it constricts …

It makes the lense more convex, needed for focus

37
Q

What happens to the pupil under parasympathetic innervation?

A

Constriction pupillae and Ciliaris muscle

38
Q

What are the only muscles to have an origin at the anterior and posterior aspect of the orbit?

A

Oblique muscle

Inferior and superior oblique

39
Q

What is the origin of the recti muscles?

A

Apex of the orbit from the annular fibrous ring

40
Q
A

A = superior re the muscle
B = levator palpebrae superioris

41
Q

What is a musc,e which is a,so classed as an extrinsic muscle of the eye?

A

LPS

Levator palpebrae superioris

42
Q

What 2 extrinsic muscles does the oculomotor not supply?

A

SO

LR

43
Q

Where does the oculomotor nerve synapse and what innervation does it carry?

A

at the ciliary ganglion

parasympathetic

44
Q

What does the optic nerve innervate?

A

Carries visual impulses from eyeball. Leaves orbit through foramen

BDS2.5 Anatomy (28 decks)

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