Saccadic eye movements elicited by intracortical microstimulation in the frontal eye field of the alert monkey

S58 CLIMBING FIBER PRO3ECTIONS FROM THE INFERIOR OLIVE TO THE PARASAGITTAL ZONES OF THE RABBIT'S UVULA YU S A T O & NEAL H. B A P ~ C K * Neurological Sciences Institute, 1120 N. W. 20th Avenue, Portland, Oregon 97209, U. S. A. In the pigmented rabbit's, injections of horseradish peroxidase (HRP) were made in the various parts of the uvula. Differential localization of labeled cells due to the retrograde axonal transport of HRP was studied in the inferior olive. Findings indicate topographycally organized projections to the cerebellar parasagittal zones. The caudal part of the nucleus beta projects coatralaterally to the most medial zone (caudal beta zone) of the uvula. The rostral part of the nucleus beta projects to a more laterally located zone (rostral beta zone). The caudolateral part of the medial accessory olive (MAO) projects to a zone (caudolateral ~ O zone) located laterally to the rostral beta zone. The dorsomedial cell column projects to a zone (dorsomedial cell column zone) located in the intermediate part of the uvula. The rostrolateral part of the ~ O projects to the most lateral zone (rostrolateral ~ 0 zone) of the uvula. The ventral lamellae of the principal olive (PO) project to a zone (ventral lamellae of PO zone) located between the rostrolateral }~0 zone and the dorsomedial cell column zone.

SACCADIC

EYE MOVEMFNTS

IN THE FRONTAL HISAO

SUZUKI,

ELICITED

EYE FIELD MASAO

AZUMA*

Using

alert

elicited

frontal

eye

Drearcuate

monkeys,

by

the

inferior

was

generally

arcuate

was

in t h e m e d i a l

part

site

lateral

for

changed

part

of

the visual

generally neurons

deed

to t h e due

toward located

by

ICMS

into

area

usually

at the

in t h e

of the

in t h e

inferior of

while

site:

The

large

SEMs,

The l o w e s t

in t h e d e e p

sites.

ICMS

threshold

cortical

the receptive

stimulating

bank

SEM vectors

hemisphere,

elicited ones.

a site within

eye movements (ICMS)

stimulating

small

of Medicine,

the anterior

stimulating

to the

the cortical

was

saccadic

The direction

stimulation,

SEM generation

SEMs were

evoked

extended

sulcus.

the

School

microstimulation

SEM was

contralateral

its amplitude

wheras

The

that was

NAKAYAMA ~

University

we examined

intracortical

field. area

Hirosaki

MICROSTIMULATION

MONKEY

and HIROFUMI

Department of Physiology, H i r o s a k i 036, J a p a n .

(SEM)

BY INTRACORTICAL

OF THE ALERT

layers.

field of