upper surface

• topUppermost part or surface
• surfaceOutermost boundary layer
• outerFarther from the center
• skinBody's outer layer
• faceHead's anterior surface

dorsal · canopy · roof · lid · crust · covering · shell · deck · crown · cap · exterior · topside · coating · veneer · glaze · finish · layer · membrane

• leaf anatomyblade, lamina, margin, midrib, petiole
• leaf blademidrib, veins, tip, apex, margin
• back anatomybackbone, back, spinal column, spine, vertebral column