Dermal papilla
Dermal Papilla
Dermal papilla (pronunciation: /ˈdɜːrməl pəˈpɪlə/) is a term used in the field of dermatology to describe a small, nipple-like extension or protrusion of the dermis layer of the skin.
Etymology
The term 'dermal papilla' is derived from the Latin words 'derma', meaning skin, and 'papilla', meaning nipple or small projection.
Definition
Dermal papillae are small, nipple-like extensions (or protrusions) that come out of the dermis, the layer of skin just beneath the epidermis. They are found in the most superficial layer of the dermis, known as the papillary dermis, and are most prominent in thick skin, such as that found on the palms of the hands and the soles of the feet.
Function
Dermal papillae play a crucial role in the regulation of hair growth and the supply of blood, oxygen, and nutrients to the epidermis. They contain capillaries and nerve endings and are responsible for the ridges that make up our fingerprints.
Related Terms
- Dermis: The layer of skin beneath the epidermis that contains the dermal papillae.
- Epidermis: The outermost layer of the skin.
- Papillary dermis: The most superficial layer of the dermis, which contains the dermal papillae.
- Capillaries: Small blood vessels that supply the dermal papillae with blood, oxygen, and nutrients.
- Nerve endings: Sensory receptors in the skin that are found in the dermal papillae.
External links
- Medical encyclopedia article on Dermal papilla
- Wikipedia's article - Dermal papilla
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