The Eyeball Flashcards Preview

Spinal Anatomy I - Exam 3 > The Eyeball > Flashcards

Flashcards in The Eyeball Deck (43):
1

What are the names of the layers of the eyeball?

- fibrous tunic
- uveal tract
- retina

2

What are the parts of the fibrous tunic of the eyeball?

- cornea
- sclera

3

The sclera of the eyeball is continous with what part of the optic nerve?

dura mater

4

What is the cornea?

rounded transparent fibrous tunic at front of eyeball

5

What is the sclera?

whitish fibrous tunic covering most of eyeball

6

What are the parts of the vascular tunic (uveal tract) of the eyeball?

- iris
- ciliary body
- choroid
- pupil

7

What is the iris?

- pigmented epithelial region of uveal tract of eyeball
- gives color of eye

8

What is the ciliary body?

part of uveal tract containing ciliaris muscle

9

What is the choroid?

vascular part of uveal tract next to retina

10

What is the pupil?

- opening in the center of iris
- gives black spot in eyeball

11

What muscles are present in the iris?

- sphincter pupillae
- dilator pupillae

12

What is the innervation of the sphincter pupillae?

oculomotor nerve, parasympathetic pathway

13

What is the innervation of the ciliaris muscle?

oculomotor nerve, parasympathetic pathway

14

What is the name of the innermost layer of the eyeball?

retina

15

What are the receptor neurons of the second cranial nerve?

rod and cone photoreceptor cells

16

What is the function of the rod cell?

provide vision in dim light conditions

17

What is the function of the cone cell?

provide vision in bright light conditions and mediate color vision

18

What is the most numerous photoreceptor cell?

rod cell

19

What is the primary afferent neuron of the second cranial nerve?

bipolar cell

20

Where are the primary sensory neurons of the second cranial nerve located?

the retina

21

What is the secondary sensory neuron of the second cranial nerve?

ganglion cell

22

What is the location of secondary sensory neurons of the second cranial nerve?

the retina

23

In what location will the axons of the secondary afferent neuron leave the eyeball?

- optic disc
- papilla of the optic nerve
- optic nerve head
- blind spot of the retina

24

What forms the optic nerve?

axons of ganglion cells

25

What is the exit site for the second cranial nerve?

optic canal of the sphenoid bone

26

The optic nerve will enter which fossa of the cranial vault?

middle cranial fossa

27

What occurs at the optic chiasma?

part of the optic nerve decussates

28

What part of the visual pathway connects the optic chiasma to the brain?

the optic tract

29

What is the innervation of the dilator pupillae?

internal carotid artery plexus, sympathetic pathway

30

What are the chambers of the eyeball in front of the lens?

- anterior chamber
- posterior chamber

31

What separates the anterior chamber and posterior chamber?

iris

32

What is the location of the anterior chamber?

between the cornea and iris

33

What is the location of the posterior chamber?

between the iris and the lens

34

What is contained in the anterior chamber?

aqueous humor

35

What is contained in the posterior chamber?

aqueous humor

36

What is the pattern of movement of the aqueous humor?

from posterior chamber to anterior chamber to scleral venous plexus

37

What is the primary cause of glaucoma?

excess aqueous humor in the chambers in front of the lens

38

What holds the lens in position?

the suspensory ligaments of the ciliary body

39

Which type of vision is accomplished by action of the ciliaris muscle?

near vision

40

What is the name given to the chamber behind the lens?

vitreous chamber

41

What is the location of the vitreous chamber?

behind the lens, in front of the retina

42

What fills the vitreous chamber?

vitreous body

43

What are the functions of the vitreous body?

- maintain retinal curvature
- allow minimal light distortion from lens to retina

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