Simple squamous epithelial tissues.. Spherical shape and spherical or oval nucleus are present at the center of the cell causing a slight rise at the center of the cell

Simple squamous epithelial tissues:
The shape of the cells in the vertical segment (P.S) is spherical and the spherical or elliptical nucleus is in the center of the cell, causing a slight rise at the center of the cell giving the spherical shape of the cells.
This type of tissue is found in the lining of the mouth, the wall of the Bowman purse and also lining the blood vessels.