Visual Pathways

Question 0

The PHENOMENON of HEMIDECUSSATION occurs at the _____________.

Answer 0

Optic Chiasm

Question 1

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

Answer 1

The axons of ganglion cells.

Question 2

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

Answer 2

1/2

Question 3

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

Answer 3

Optic Tracts

Question 4

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

Answer 4

Lateral Geniculate Nucleus

Question 5

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

Answer 5

Pretectal Nucleus

Superior Colliculus

Question 6

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

Answer 6

AREA 17 in the OCCIPITAL LOBE

PULVINAR NUCLEUS in the THALMAMUS

Question 7

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

Answer 7

AREA 18 and AREA 19

in the OCCIPITAL LOBE

Question 8

The PRETECTAL NUCLEUS sends IMPULSES TO ____________ of the eye.

Answer 8

Intrinsic Muscles

Question 9

SUPERIOR COLLICULUS sends IMPULSES TO ____________.

Answer 9

Cranial Nerve Nuclei III, IV and VI

Question 10

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

Answer 10

Extrinsic Muscles

Question 11

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

Answer 11

4

Question 12

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

Answer 12

Halves

Question 13

PRIMARY DEGENERATION is also known as ____________.

Answer 13

Anterograde

Question 14

SECONDARY DEGENERATION is also known as _______________.

Answer 14

Retrograde

Question 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.

Answer 15

Topographically

Question 16

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

Answer 16

Large

Question 17

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

Answer 17

Detailed Vision

Periphery

Question 18

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

Answer 18

6

Question 19

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

Answer 19

Fast

Slow

Question 20

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

Answer 20

Eye—–>LGN——>Area 17

Question 21

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

Answer 21

Eye—–>LGN——>Pulvinar——>Areas 18 & 19

Question 22

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

Answer 22

Binocular

Question 23

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

Answer 23

Binocular Mixing

Question 24

This PHENOMENON occurs at the OPTIC CHIASM.

Answer 24

HEMIDECUSSATION