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Flashcards in Visual Pathways Deck (25):
0

The TWO (2) OPTIC NERVES, ONE from EACH EYE, are made up of ___________.

The axons of ganglion cells.

1

The PHENOMENON of HEMIDECUSSATION occurs at the _____________.

Optic Chiasm

2

In regards to HEMIDECUSSATION, what portion of MEDIAL FIBERS cross to the other side?

1/2

3

Once 1/2 of the MEDIAL FIBERS have crossed to the other side, they are referred to as __________.

Optic Tracts

4

The OPTIC TRACT of EACH SIDE passes back to ___________ of the THALAMUS.

Lateral Geniculate Nucleus

5

The OPTIC TRACT of EACH SIDE passes back to ___________ and __________in the MIDBRAIN.

Pretectal Nucleus
Superior Colliculus

6

The LATERAL GENICULATE NUCLEUS sends IMPULSES TO __________ in the _________ and ___________ in the __________.

AREA 17 in the OCCIPITAL LOBE

PULVINAR NUCLEUS in the THALMAMUS

7

The PULVINAR NUCLEUS sends impulses to __________ and ________ in the __________.

AREA 18 and AREA 19

in the OCCIPITAL LOBE

8

The PRETECTAL NUCLEUS sends IMPULSES TO ____________ of the eye.

Intrinsic Muscles

9

SUPERIOR COLLICULUS sends IMPULSES TO ____________.

Cranial Nerve Nuclei III, IV and VI

10

Cranial Nerve Nuclei III, IV and V send IMPULSES TO ___________ of the eye.

Extrinsic Muscles

11

It has been concluded that there are ___ different FIBER GROUPINGS.

4

12

CONDUCTION RATES of the FOUR (4) FIBER GROUPS step down by __________.

Halves

13

PRIMARY DEGENERATION is also known as ____________.

Anterograde

14

SECONDARY DEGENERATION is also known as _______________.

Retrograde

15

The HIGH degree of POINT-TO-POINT projection of the RETINA upon LGN and that the LGN has on the STRIATE CORTEX means that the LGN is ______________ organized.

Topographically

16

CENTRAL VISUAL FIELD is represented by relatively _________ areas of the LGN.

Large

17

The CENTRAL VISUAL FIELD is where ____________ is considerably better than ____________.

Detailed Vision
Periphery

18

In the HUMAN there are ___ LAYERS in the LGN which are SERVED ALTERNATELY by the two eyes.

6

19

ELECTRICAL ACTIVITY in the CORTEX can be divided into _________ and _______ responses.

Fast
Slow

20

In the FAST response of the CORTEX the ________ sends impulses to _________ which sends impulses to _________.

Eye----->LGN------>Area 17

21

In the SLOW response of the CORTEX the ________ sends impulses to _________ which sends impulses to _________ then finally to __________.

Eye----->LGN------>Pulvinar------>Areas 18 & 19

22

In CONTRAST to the LGN, the organization of CORTICAL CELLS is _________.

Binocular

23

LGN INPUTS are activated by stimuli to EITHER EYE resulting in __________.

Binocular Mixing

24

This PHENOMENON occurs at the OPTIC CHIASM.

HEMIDECUSSATION