त्वग्वै ग्रहः ।स स्पर्शेनातिग्रहेण गृहीतः ।त्वचा हि स्पर्शान् वेदयत ।इत्यष्टौ ग्रहा अष्टावतिग्रहाः ॥३,२.९ ॥
In plain words
The skin is a grasper, and it is grasped by touch as the over-grasper; for by the skin one feels touches. These are the eight graspers and the eight over-graspers."