Tongue papillae. Light micrograph of a section through the tongue, showing its filiform papillae (top). They project from the tongue's upper surface, giving it its rough texture. Taste buds are located between the papillae at the sides and base of the tongue. Underneath this surface layer, the tongue is composed of muscle fibres (white and pink stripes, bottom) that attach it to the mouth and enable it to move. Haematoxylin-azocarmine stain. Magnification: x30 when printed 10cm wide.