Isla Bennett
The nail plate, also known as the nail body, is the hard, protective cover at the end of our fingers and toes. It is made of a tough protein called keratin and is generated by the nail matrix. The nail plate is attached to the nail bed, which lies underneath it and attaches it to the distal phalanx. The distal nail bed is also where the onychodermal band is found. This band functions as a protective barrier on the free edge of the nail. The distal nail matrix is visible through the nail plate as a white half-moon structure called the lunula.
| Characteristics | Values |
|---|---|
| Definition | The distal nail plate is the hard keratin cover of the dorsal portion of the distal phalanx. |
| Structure | The nail plate is a relatively flat, slightly curved, plate-like structure covering the dorsal surface of the distal digit and extending over its free edge. |
| Function | The nail plate acts as protection from trauma, as a pressure plate to amplify fine touch perception in underlying structures, and as an extension of the distal digit. |
| Composition | The nail plate is made of a tough rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates. |
| Blood Supply | The nail plate does not contain any nerves or blood vessels. |
| Growth | The nail plate is generated by the nail matrix, with the proximal matrix forming the dorsal nail plate and the distal matrix contributing to its ventral portion. |
| Abnormalities | Onycholysis is a condition where the nail plate separates from the nail bed, resulting in white discoloration. Splinter hemorrhages are thin red or brown lines that occur beneath the nail plate due to leaking capillaries. |
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What You'll Learn
- The nail plate is the hard, protective cover of the distal digit
- The nail bed is the red-pink area beneath the nail plate
- The hyponychium is the epithelium located beneath the nail plate
- The nail matrix is responsible for the formation of the hard nail plate
- The nail plate is used as a tool for climbing, scratching and digging
The nail plate is the hard, protective cover of the distal digit
The nail plate is an important structure that serves multiple functions. Firstly, it acts as a protective cover, shielding the distal phalanx, fingertip, and surrounding soft tissues from injuries. This protective function helps to prevent trauma to the outer half of the distal digit. Secondly, the nail plate amplifies fine touch perception in the underlying structures. It does this by exerting counter-pressure on the pulp of the finger, enhancing the sensitivity of the fingertip. Finally, the nail plate functions as a tool, enabling precise movements and actions such as an "extended precision grip," which can be useful for tasks like pulling out a splinter.
The nail plate is part of the larger nail unit, which also includes the nail bed and the hyponychium. The nail bed lies underneath the nail plate, attaching it securely to the distal phalanx. It provides a smooth surface for the growing nail plate to slide over. The hyponychium, also known as the "quick," is the thickened layer of dermis or epithelium found beneath the free end of the nail plate. It forms a seal that protects the nail bed and can be recognised by its glassy, greyish colour in fair-skinned individuals.
The nail plate is formed through the division and keratinisation of cells within the nail matrix, also known as the germinal matrix. The nail matrix is the active tissue that generates and hardens cells, which then move outward to form the nail plate. The width and thickness of the nail plate are determined by the size, length, and thickness of the nail matrix. The nail matrix is the only part of the nail unit that contains melanocytes, which contribute to the formation of the hard nail plate.
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The nail bed is the red-pink area beneath the nail plate
The nail bed is highly innervated, and removing the nail plate can be excruciatingly painful. It is the area where the nail plate rests and attaches to the distal phalanx. The nail plate does not contain any nerves or blood vessels, but the nail bed provides nourishment to the entire nail unit. The nail bed is also the area where the nail matrix, or lunula, ends. The lunula is the whitish, crescent-shaped base of the visible nail, which can be seen through the nail plate at the base of the nail.
The nail bed epithelium is thin, composed of 2-3 cell layers, and forms short papillae that connect to the underlying dermis and the distal phalanx bone through collagen fibres. At the point of detachment of the nail plate from the nail bed, the granular layer reappears. This area between the nail bed and the distal groove is similar to the human hyponychium, although there may be some differences in extension.
The nail bed is crucial for the growth of the nail plate. While the nail bed itself does not contribute to the growth, it provides a smooth surface for the nail plate to slide over as it grows. The nail matrix, located within the nail bed, is the active tissue that generates cells. As new nail plate cells are produced, they push older cells forward, causing them to become compressed, flat, and translucent. This movement of cells over the nail bed gives rise to the growth of the nail plate.
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The hyponychium is the epithelium located beneath the nail plate
The nail plate, also known as the nail body, is the hard nail area from the nail root to the free edge. It is made of translucent keratin protein. The nail plate is strongly attached to the nail bed and does not contain any nerves or blood vessels. The nail bed is the skin beneath the nail plate, and it is the area of the nail on which the nail plate rests.
The nail bed is a specialised form of skin epithelium and has the same four layers of the epidermis of the skin. The nail plate is made up of tightly packed, hard, keratinized epidermal cells. The nail matrix is the active tissue that generates cells. The cells harden as they move outward from the nail root to the nail plate. The nail matrix is also known as the matrix unguis, keratogenous membrane, or onychostroma. It is the part of the nail bed that is beneath the nail and contains nerves, lymph, and blood vessels.
The eponychium is a small band of living cells (epithelium) that extends from the posterior nail wall onto the base of the nail. The perionyx is the projecting edge of the eponychium covering the proximal strip of the lunula. The lunula is the white 'half-moon' appearance of the germinal matrix through the proximal nail plate.
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The nail matrix is responsible for the formation of the hard nail plate
The nail is made up of the nail plate, the nail matrix, the nail bed, and the grooves surrounding it. The nail plate, also known as the nail body, is the hard, translucent, keratin protein plate that extends from the nail root to the free edge. The nail matrix, also called the matrix unguis, keratogenous membrane, or onychostroma, is the active tissue that generates cells to form the nail plate. The nail matrix is responsible for the formation of the hard nail plate through the following process:
The nail matrix is made up of two parts: the germinal matrix and the sterile matrix. The germinal matrix is an area of soft tissue proximal to the sterile matrix, containing special cells that divide and become keratinised to form the nail plate. The germinal matrix is thick but abruptly thins at the juncture with the nail bed. The sterile matrix lies underneath the nail plate, attaching it to the distal phalanx. It is responsible for keeping the nail attached to the underlying skin and contributes about 10% of the cells that make up the nail plate.
The continuous cell division within the nail matrix pushes the nail plate over the nail bed as it matures. The cells produced by the nail matrix harden as they move outward from the nail root to the nail plate, resulting in the hard nail plate. The width and thickness of the nail plate are determined by the size, length, and thickness of the nail matrix, while the shape of the nail plate is influenced by the shape of the fingertip bone.
The nail matrix is not visible as it is located beneath the nail plate and contains nerves, lymph, and blood vessels. The lunula, or the "small moon," is the visible part of the matrix, appearing as a whitish crescent-shaped base of the nail. The lunula is best seen in the thumb and may not be visible in the little finger. It appears white due to the reflection of light at the point where the nail matrix and nail bed meet.
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The nail plate is used as a tool for climbing, scratching and digging
The nail plate is a protective structure located at the tip of the fingers and toes of primates, corresponding to the claws in other animals. It is made of a tough rigid protein called alpha-keratin, which gives it strength and flexibility. The nail plate is the most visible part of the nail unit, covering the nail matrix and the nail bed below it. The width and thickness of the nail plate are determined by the size, length, and thickness of the matrix, while the shape of the fingertip bone determines its transverse shape.
The nail plate has multiple functions, including protection from trauma, enhancing tactile sensation, and assisting with precise delicate movements of the distal digits. It acts as an extension of the distal digit, providing support to the underlying dorsal surface. This extension of the phalanx is particularly useful for climbing, scratching, and digging, as it provides a sharp edge for these activities.
In the context of climbing, the nail plate provides a gripping surface, allowing individuals to grasp and hold onto surfaces more effectively. This can be especially useful when climbing trees, rocks, or other structures where a secure grip is required. The nail plate's hardness and curvature also enable individuals to scratch various surfaces effectively. This action can be used for digging, providing a means to displace and move objects or materials.
Additionally, the nail plate plays a role in fine touch perception. Its flat, slightly curved structure amplifies the sensitivity of the underlying structures, enhancing the overall tactile sensation of the fingertip. This sensitivity is further improved by the counter-pressure exerted on the pulp of the finger when it touches an object.
The nail plate is also important in the fields of carpentry and construction. In these contexts, the term "nail plate" refers to a metal plate with nail holes used to protect wood and securely join two pieces together. This application of the nail plate helps prevent the wood from splitting when nails are driven through it.
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Frequently asked questions
The nail plate is the hard, protective cover of the dorsal portion of the distal phalanx. It is made of translucent keratin protein.
The distal nail plate area is the area at the tip of the digit (finger or toe) where the nail plate covers the dorsal surface of the distal digit and extends over its free edge.
The nail plate acts as protection from trauma, as a pressure plate to amplify fine touch perception in underlying structures, and as an extension of the distal digit.
The nail plate is made of a tough, rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates.
