Download Motor Systems: Gaze, Reach and Grasp

Posterior Structures involved in Saccades and Reaching
Structure in Monkey
V3a
V6a / PRR
LIP
AIP
MIP / PRR
?
V7?
MT/MST
Brodman’s area 5
S1 (B1,2,3)
Equivalent Human
Structure
Likely IPTO
Medial POJ/SPOC
mIPS (mid-posterior IPS),
possibly lateral extending
into inferior parietal.
aIPS: Junction between
anterior IPS and inferior
parietal sulcus
mIPS (mid-posterior IPS),
possible more medial in
superior parietal.
Angular Gyrus
MT+, posterior temporal
occipital fossa
Same
Putative Function
Saccade Goals
Reach Goals
Saccades: attention/
intention / integration
Grasping
Calculation of Reach
Vector in Visual Coords,
Online monitoring of reach
feedback signals
Knowledge of left vs. Right,
Calculation of Reach
Vector in Motor Coords.
Manual Pointing/Tool Use
Visuospatial Functions
Visual Motion Processing
Multi-sensory Integration
Primary Somatosensory
Frontal Structures involved in Saccades and Reaching
Structure in Monkey
Rostral Cingulate motor
area (CMAr)
Caudal Cingulate motor
area - ventral bank (CMAv)
Caudal Cingulate motor
area - dorsal bank (CMAd)
BA8: Frontal Eye Fields
Supplementary Eye Fields
Equivalent Human
Structure
Rostral Cingulate zone
(RCZ) anterior (RCZa)
Rostral Cingulate zone
posterior (RCZp)
Caudal cingulated zone
(CCZ)
Overlaps Dorsal Premotor;
Intersection of the superior
precentral sulcus with the
superior frontal sulcus
Medial wall of frontal lobe
Paracentral sulcus
(controversy on location)
-border of the SMA and the
Putative Function
Conflict monitoring
Selection for action
movement execution (eg
finger movements)
Saccades & gaze shifts:
Internal / Voluntary,
Pursuit
Saccades and eye-head
Gaze Shifts: arbitrary rules
& transformations
Cingulate Eye Fields
Dorsal Premotor Cortex
pre-SMA
Posterior part of Anterior
cingulate cortex (ACC)
Controversy on location)
Dorsal-Anterior to M1.
Lateral Premotor Cortex
Pre-Supplementary Motor
Area (Rostral portion of
area 6)
Pre-Supplementary Motor
Area
Supplementary Motor Area
(Caudal area 6a)
Supplementary Motor Area
Primary Motor Cortex (B4)
Dorsal part of precentral
gyrus, anterior of central
sulcus
BA 45 and 46
Dorso-lateral Prefrontal
Cortex
Eye Movement Control
Visual Control of Reach
Visual and proprioseptive
representations of arm
position
Representations triggered
by attended sensory events
processing or maintenance
of relevant sensory
information
-a sub-region of prefrontal
cortex
- somatotopically arranged
map of the body
- e.g., rostral orofacial
(border with pre-SMA),
hindlimb caudal sites
Reach Implementation
Spatial Memory and
Executive Function