belongs to the posterior parietal cortex , is counted as the lower parietal minilobe and covers the angular cortex (gyrus angularis). The lower-anterior part of the area is often counted as the upper outer temporal lobe region where, on the left side together with area 22 , it is part of the sensory speech center (Wernicke's field).
In left-sided injury within the gyrus angularis with Brodmannarea 39, the individual often exhibits the so-called Gerstmann syndrome
The following disorders are included in the syndrome.
1. Finger agnosia = inability to recognize and name the fingers of one hand or the other.
2. Right - left weathering; have lost the ability to determine what is "on the right" and what is "on the left".
3. Agraphy = inability to write.
4. Acalculi = inability to "count", i.e. unable to use the four simple counting methods.