The posterior segment (rear portion of eye) Flashcards Preview

Anatomy and Physiology of the eye > The posterior segment (rear portion of eye) > Flashcards

Flashcards in The posterior segment (rear portion of eye) Deck (25)
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1

What substance acts as a shock absorber and maintains the spherical shape of the globe?

Vitreous

2

Small particles of dead cells or other debris that become suspended in the vitreous, or particles of the vitreous itself that degenerate in the normal aging process are called

Floaters

3

The transparent layer of tissue that forms the innermost lining of the globe is the

Retina

4

The retina is composed of an inner layer of nerve cells and an outer __________ that lies against the choroid

Pigment Epithelium

5

The base of the nerve cell layer contains two types of photoreceptor cells called

Rods and Cones

6

The ____ are largely responsible for vision in reduced light and for peripheral vision

Rods

7

The _____ provide sharp central vision and the perception of color

Cones

8

The location where the central retinal artery enter and the central retinal vein, as well as the nerve fibers, exit, is called

Optic Disc

9

The specialized area of the retina close to the center of the back of the eye that provides detailed central vision is the

Macula

10

The center of the macula is called the

Fovea

11

What cells are concentrated in the macula?

Cone cells

12

A type of retinal cell that accepts electric (nerve) impulses from the photo-receptors and passes them to the ganglion cells are called

A bipolar cell

13

The type of retinal cell that accepts electric (nerve) impulses from the bipolar cells and sends the impulses via axons through the optic disc to the brain are

Ganglion cells

14

the long fiber-like portion of the ganglion cell that courses over the surface of the retina and converges at the optic disc is called

An Axon

15

The nerve that carries electric impulses to the brain's visual cortex, where they are integrated to produce the sensation of light is the

Optic Nerve

16

The sightless "hole" in the normal visual field corresponding to the optic disc where there are no photoreceptors is called the

Physiologic blind spot

17

The small central depression in the optic disc is called the

Cup

18

The comparison of the size of the central cup to the size of the optic nerve, expressed as a percentage or decimal fraction, is called

Cup/disc ratio

19

The route taken by light-generated nerve impulses after they leave the eye is called the

Visual Pathway/retrobulbar visual pathway

20

The point behind the eyes in the brain where the two optic nerves merge and the axon fibers from the nasal retina of each eye cross to the opposite side is call the

Optic Chiasm

21

The part of the brain between the optic chiasm and the lateral geniculate body is the

Optic Tract

22

The part of the brain along the visual pathway where optic fibers synapse to the optic radiations and transmit visual impulses is the

Lateral geniculate body

23

the connection between nerves, where electric (nerve) impulses are transmitted is called

Synapse

24

The nerve fibers that transmit visual information from the lateral geniculate body to the visual cortex are called

Optic radiation

25

the area of the brain responsible for the initial conscious registration of visual information is the

Visual Cortex