epidermis is the uppermost layer of the skin.
epidermis is the uppermost layer of the skin.
which is the uppermost layer of the skin?
epidermis
the dermal papillae are part of the uppermost layer of the dermis, the papillary dermis, and the ridges they form greatly increase the surface area between the dermis and epidermis. because the main function of the dermis is to support the epidermis, this greatly increases the exchange of oxygen, nutrients, and waste products between these two layers. additionally, the increase in surface area prevents the dermal and epidermal layers from separating from each other by strengthening the junction between them. with age, the papillae tend to flatten and sometimes increase in number.
dermis
oceanic crust









































oceanic crust is the uppermost layer of the oceanic portion of a tectonic plate. it is composed of the upper oceanic crust, with pillow lavas and a dike complex, and the lower oceanic crust, composed of troctolite, gabbro and ultramafic cumulates. the crust overlies the solidified and uppermost layer of the mantle. the crust and the solid mantle layer together constitute oceanic lithosphere.
oceanic crust