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Most cephalopod dermal structures take the form of tubercles, and these are the only cartilaginous dermal structures (the various "dermal cushions" being composed of other forms of connective tissue). All three main types of cartilage found in vertebrates are represented among the different squid species: hyaline, elastic and fibrocartilage.
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 ...
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.
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]
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.
Papillomatosis is skin surface elevation caused by hyperplasia and enlargement of contiguous dermal papillae. [1] These papillary projections of the epidermis form an undulating surface under microscopic examination.
Pig skin especially shares similar epidermal and dermal thickness ratios to human skin: pig and human skin share similar hair follicle and blood vessel patterns; biochemically the dermal collagen and elastin content is similar in pig and human skin; and pig skin and human skin have similar physical responses to various growth factors. [1] [2]