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The dermal papillae (DP) (singular papilla, diminutive of Latin papula, 'pimple') are small, nipple-like extensions (or interdigitations) of the dermis into the epidermis. At the surface of the skin in hands and feet, they appear as epidermal, papillary or friction ridges (colloquially known as fingerprints ).
Histologic image showing a section of epidermis.Stratum lucidum labeled near center. Section of epidermis. The stratum lucidum (Latin, 'clear layer') is a thin, clear layer of dead skin cells in the epidermis named for its translucent appearance under a microscope.
In a growing fetus, fingerprints form where the cells of the stratum basale meet the papillae of the underlying papillary layer of the dermis, resulting in the formation of the ridges on the fingers. Fingerprints are unique to each individual and are used for forensic analyses because the patterns do not change with the growth and aging processes.
Side view of a papilla of the hand. Cortical layer. Tactile corpuscle. Small nerve of the papilla, with neurolemma. Its two nerve fibers (axons) running with spiral coils around the tactile corpuscle. Apparent termination of one of these fibers. A tactile papilla seen from above so as to show its transverse section. Cortical layer. Nerve fiber.
The cat's tongue is covered in a mucous membrane and the dorsal aspect has 5 types of sharp spines, or papillae.The 5 papillae are filiform, fungiform, foliate, vallate, and conical. [2]
The dermis has two layers: the papillary dermis and the reticular layer. The papillary layer is the superficial layer that forms finger-like projections into the epidermis (dermal papillae), [5] and consists of highly vascularized, loose connective tissue. The reticular layer is the deep layer of the dermis and consists of the dense irregular ...
In the dermis, dermal papillae (DP) (singular papilla, diminutive of Latin papula, 'pimple') are small, nipple-like extensions of the dermis into the epidermis, also known as interdigitations. The distal convoluted tubule (DCT), a portion of kidney nephron , can be recognized by several distinct features, including lateral membrane ...
The skin in this area contains dermal papillae to increase friction, such as are also present on the fingers and used for fingerprints. The opisthenar area (dorsal) is the corresponding area on the posterior part of the hand. The heel of the hand is the area anteriorly to the bases of the metacarpal bones, located in the proximal part of the palm.