What Is the Dermal Papilla?

The dermal papilla layer is also called the grain layer or the thermostatic layer. It is the upper layer of the dermis, that is, the layer from the surface of the dermis to the bottom of the hair follicles and sweat glands.

Dermal papilla

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The dermal papilla layer is also called the grain layer or the thermostatic layer. It is the upper layer of the dermis, that is, the layer from the surface of the dermis to the bottom of the hair follicles and sweat glands.

Chinese name

Dermal papilla

The dermal papilla layer is also called the grain layer or the thermostatic layer. It is the upper layer of the dermis, that is, the layer from the surface of the dermis to the bottom of the hair follicles and sweat glands. Its surface meshes with the epidermal layer of the epidermis. After the epidermis is removed, the surface of this layer appears as a papillae, so it is called the nipple layer. During tanning, the nipple layer is also called the grain layer, and because this layer contains sweat glands, fat glands, and erector hair muscles that can regulate the body temperature of animals, it is also known as the thermostatic layer. The thickness ratio of the papilla layer to the dermis varies depending on the animal species and the location of the skin. The collagen fiber bundles in this layer are thinner than the reticular layer underneath, the fiber weaving angle is smoother, and the tissue structure and physical and mechanical strength are weaker than the reticular layer. Protect the nipple layer and the two layers during tanning To avoid affecting the beauty of the grain and the strength of the leather. ^[1]