Vision - Muscles and Neural Pathways Flashcards Preview

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Flashcards in Vision - Muscles and Neural Pathways Deck (35)
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1

What are the different types of ocular muscles?

Intrinsic
Extrinsic

2

What is the role of the intrinsic muscles?

Control pupil diameter
Help alter lens curvature

3

What is the role of the extrinsic muscles?

Move the eye

4

How many extrinsic muscles are there?

6

5

How many and what are the recti muscles?

4 recti muscles
Medial rectus
Lateral rectus
Inferior rectus
Superior rectus

6

How many and what are the oblique muscles?

2
Superior oblique
Inferior oblique

7

Where do the recti muscles arise from?

Apex of the orbit from an annular fibrous ring

8

Where does the superior oblique arise from?

Roof of the orbit posteriorly

9

Where does the inferior oblique arise from?

Floor of the orbit anteriorly

10

What muscle elevates the upper eyelid?

Levator palpeerde superioris

11

What nerve innervates the superior oblique?

Trochlear (4)

12

What nerve innervates the lateral rectus?

Abducent (6)

13

What nerve innervates the majority of extrinsic muscles?

Occulomotor (3)

14

What axis are the extrinsic muscles attached along?

Orbital axis

15

What does the medial rectus cause?

Adduction of eyeball

16

What does the lateral rectus cause?

Abduction of eyeball

17

What is the primary action of the superior rectus?

Elevation

18

What is the primary action of the inferior rectus?

Depression

19

What is the primary action of the superior oblique?

Intorsion

20

What is the primary action of the inferior oblique?

Extorsion

21

What is a strabismus?

Squint

22

What is the cause of strabismus?

Misalignment of the eyes

23

What is esotropia?

Convergent quint

24

What is exotropia?

Divergent squint

25

What are the consequences of a squint?

Amblyopia (lazy eye)
Diplopia (double vision)

26

What are the intrinsic muscles of the eye?

Ciliaris muscle
Constrictor pupillae
Dilator pupillae

27

What is the result of right optic nerve damage?

Blindness in one eye

28

What is the result of optic chiasma disruption?

Bitemporal hemianopia

29

What is the result of right optic tract damage?

Contralateral homonymous hemianopia

30

What is the result of optic radiation damage

Contralateral homonymous hemianopia