This medium magnification
view of the tongue shows the base of circumvallate papillae and its surrounding
groove (fr. Latin, vallum = moat). On the left side of the groove is a duct
and numerous secretory units of the serous von Ebner's glands. On the right,
arrayed along the side of the papilla facing the groove are taste buds, which
stain more lightly that the surrounding stratified squamous epithelium.
