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Sensorimotor (PRIMARY MOTOR CORTEX :red_flag: (Precentral gyrus of the…
Sensorimotor
SENSORIMOTOR
SYSTEM
The somatosensory system is tightly integrated with the
motor system
Motor output is guided by sensory input
Learning changes the nature and locus of sensorimotor control
Conscious motor behavior can become automatic with
training
The neuroanatomical site of control shifts
Dorsal-Column Medial-Lemniscus System
Mainly touch and proprioception
Anterolateral System
Mainly pain and temperature
PRIMARY SOMATOSENSORY
CORTEX（S1）
Input is largely contralateral
Right sensory field is represented on left cortex
Somatotopic organization
Regions of the body that are
more sensitive are allocated
more cortex
Called the
Somatosensory
Homunculus
SECONDARY
SOMATOSENSORY CORTEX
Mainly receives input from S1
Somatotopic
Receives input from both sides of the body
Much of the output
from S1 and S2 goes to
the association cortex
in the posterior parietal lobe
MOTOR ASSOCIATION
CORTEX :red_flag:
Posterior Parietal Association Cortex :explode:
Integrates Information about body part
location and external objects
Receives Visual, Auditory, and
Somatosensory Information
Outputs to association cortex
Dorsolateral Prefrontal Association Cortex :explode:
Evaluates external stimuli and initiates
voluntary reactions
Outputs to Secondary Motor Cortex and
Primary Motor Cortex
SECONDARY MOTOR
CORTEX
May be involved in
programming movements in
response to input from the
dorsolateral prefrontal cortex
Active during imagining or
planning of movements
Outputs to primary motor cortex
PRIMARY MOTOR
CORTEX :red_flag:
Precentral gyrus of the frontal lobe
Major point of convergence
of cortical sensorimotor signals
Major point of departure
of signals from cortex
Stimulation
:
Produces complex, sequences :explode:
Recordings
:
Neuron firing is most closely related to target location :explode:
Primary motor cortex involved in initiating whole movements
INFORMATION FLOW
Association---Secondary---Primary
Posterior Parietal
Dorsolateral Prefrontal
MOTOR HOMUNCULUS
Somatotopic
• More cortex devoted to body parts
that make complex movements
