Cerebral anatomy

 

7: Cortical homunculus by Wilder Graves Penfield [174]. It represents the mapping the primary sensory (S1) and primary motor (M1) cortex. S1 lies on the posterior wall of the central sulcus (cf. post central gyrus in figure 1.6(a)) and M1 on the anterior part. These maps were established by direct electrical stimulation on patients during surgery. Primary auditory cortices (A1), left and right, are represented in the temporal lobes.

 

 

 

 

 

Functions

Parietal

Somatosensory cortex (S1)

-          Contralateral representation of sensory input

Somatosensory cortex S2

-          Lateral aspect of the post central gyrus

-          Bilateral representation of sensation

-          ?Different role to S1

PIMO

-          Pain sensation

Parieto-insular vestibular cortex (PIVC)

-          Vestibular integration

Posterior parietal cortex

-          Gerstman’s syndrome

-          Angular gyrus syndrome (=Gerstman’s +alexia, aphasia, constructional deficits)

-          Inferior parietal lobule

o    Conductive aphasia

-          Superior parietal lobule

o    Optic ataxia

o    Visuospatial dissociation

o    Gaze paresis (oculomotor apraxia)

o    Simultanagnosia

-          Intraparietal sulcus

o