Noah Sinclair
The term for the area beneath the nail is subungual, derived from the Latin words sub meaning under and unguis meaning nail. It is used in medical contexts to describe conditions or procedures that occur beneath the nail plate and over the nail bed. For example, a subungual hematoma is a collection of blood that occurs under the nail due to trauma or injury, causing pain and discoloration. Understanding this term is important for healthcare providers to effectively communicate about and treat issues related to the area beneath the nail.
| Characteristics | Values |
|---|---|
| Medical term | Subungual |
| Root | Ungual, from the Latin 'unguis' meaning nail |
| Meaning | Pertaining to below the nail |
| Area | Beneath the nail plate and over the nail bed |
| Conditions | Subungual hematoma, subungual melanoma |
| Growth rate | Related to the length of the terminal phalanges (outermost finger bones) |
| Growth rate (fingernails) | Average of 3.5mm per month |
| Growth rate (toenails) | Average of 1.6mm per month |
| Recovery time (fingernails) | 4-6 months to regrow |
| Recovery time (toenails) | 8-18 months to regrow |
| Separation condition | Onycholysis |
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What You'll Learn
Subungual hematoma
The term "subungual" refers to the area below the nail, specifically the region beneath the nail plate and over the nail bed. It is derived from the Latin words "sub" (meaning under) and "unguis" (meaning nail). In anatomy, subungual areas are significant for various medical conditions and procedures.
A subungual hematoma is a collection of blood that occurs beneath the nail due to trauma or injury. It is often accompanied by intense pain, throbbing, and discoloration of the nail. The blood collects between the nail and the nail bed, causing pressure and pain. Subungual hematomas can be caused by a direct blow or a crush injury to the distal phalanx, such as getting a finger pinched in a doorway.
The main complication associated with subungual hematomas is the risk of infection. If the bleeding occurs under a large area of the nail surface, the nail bed may be injured, and a doctor may need to remove the nail and use stitches to repair the nail bed. In some cases, the nail may fall off on its own after several weeks due to the pooled blood separating it from its bed. A new fingernail can regrow in as little as eight weeks, while a new toenail may take up to six months.
Treating a subungual hematoma typically involves relieving the pressure and pain caused by the pooled blood. This can be done through decompression or trephination, which involves making a small hole in the nail to allow the blood to drain. Cautery, using a heated wire or laser, or a needle can be used to create the hole. Simple trephination is often sufficient to relieve the symptoms of a subungual hematoma.
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Subungual melanoma
The term "subungual" refers to the area below the nail plate, which lies over the nail bed. It is derived from the Latin words "sub" meaning under and "unguis" meaning nail. Understanding this terminology is important as many medical conditions and procedures are related to this specific area.
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Nail bed
The term "subungual" is used in medical contexts to refer to the area beneath the nail. It is derived from the Latin words "sub" meaning "under", and "unguis" meaning "nail". Understanding this term is essential in medicine as it helps healthcare professionals communicate effectively about conditions and treatments related to the area beneath the nail. For example, a "subungual hematoma" refers to bleeding that occurs under the nail, often due to trauma or injury.
Now, the nail bed is the skin beneath the nail plate. It is the area of the nail on which the nail plate rests. The nail bed is highly innervated, and the removal of the nail plate is often excruciatingly painful as a result. The nail sinus (sinus unguis) is where the nail root is; i.e., the base of the nail underneath the skin. It originates from the actively growing tissue below, the matrix. The nail plate (corpus unguis) is the visible hard nail area from the nail root to the free edge, made of translucent keratin protein. The nail plate does not contain any nerves or blood vessels. However, the nail bed does contain nerves and blood vessels that supply nourishment to the entire nail unit.
The lunula is the visible part of the matrix, appearing as a whitish crescent-shaped base of the visible nail. It can best be seen in the thumb and may not be visible in the little finger. The lunula appears white due to a reflection of light at the point where the nail matrix and nail bed meet. The hyponychium, informally known as the "quick", is the epithelium located beneath the nail plate at the junction between the free edge and the skin of the fingertip. It forms a seal that protects the nail bed. The onychodermal band is the seal between the nail plate and the hyponychium and can be recognised in fair-skinned people by its glassy, greyish colour.
In mammals, the growth rate of nails is related to the length of the terminal phalanges (outermost finger bones). Thus, in humans, the nail of the index finger grows faster than that of the little finger, and fingernails grow up to four times faster than toenails. Fingernails grow at an average rate of approximately 3.5 mm per month, while toenails grow at around half that rate.
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Nail plate
The nail plate, also known as the corpus unguis or nail body, is the hard, protective, outer layer of the nail. It is made of translucent keratin protein and extends from the nail root to the free edge. The nail root is the portion of the nail found under the skin at the proximal end, where the nail begins and grows from. The nail plate is the result of the hardening of cells produced by the nail matrix, which is the active tissue (or germinal matrix) that generates cells.
The nail plate is the visible part of the nail. In contrast, the nail bed is the skin beneath the nail plate, where the nail plate rests. The nail bed is made of two types of tissues: the dermis and the epidermis. The epidermis is attached to the dermis by tiny longitudinal "grooves" called matrix crests (cristae matricis unguis). The nail bed is highly innervated, and removal of the nail plate is often excruciatingly painful as a result.
The free margin or distal edge is the anterior margin of the nail plate and corresponds to the abrasive or cutting edge of the nail. The hyponychium, informally known as the "quick", is the epithelium located beneath the nail plate at the junction between the free edge and the skin of the fingertip. It forms a seal that protects the nail bed. The onychodermal band is the seal between the nail plate and the hyponychium. It is just under the free edge, in the portion of the nail where the nail bed ends. The paronychium is the soft tissue border around the nail, and paronychia is an infection in this area.
The growth rate of nails is related to the length of the terminal phalanges (outermost finger bones). In humans, the nail of the index finger grows faster than that of the little finger, and fingernails grow up to four times faster than toenails. On average, fingernails grow at a rate of approximately 3.5 mm per month, while toenails grow at a rate of approximately 1.6 mm per month.
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Nail root
The nail root is the portion of the nail located under the surface of the skin at the proximal end of the nail, where the nail begins and grows from. The nail itself has a structure that includes the nail root, which is found under the nail plate (the hard part of the nail) and over the nail bed.
The nail root is part of the nail matrix, which is the actively growing 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 matrix produces cells that become the nail plate.
The nail plate, also known as the nail body, is the visible hard nail area from the nail root to the free edge, made of translucent keratin protein. The nail plate is about half a millimeter thick and slightly curved. It is made of a tough rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates.
In humans, fingernails grow at an average rate of approximately 3.5 mm per month, while toenails grow at about half that rate, with an average of 1.6 mm per month. The growth rate of nails is related to the length of the terminal phalanges (outermost finger bones), so the nail of the index finger grows faster than that of the little finger.
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Frequently asked questions
The medical term for beneath the nail is "subungual", derived from the Latin words "sub" meaning under and "unguis" meaning nail.
Some conditions that affect the area beneath the nail include subungual hematoma, which is a collection of blood that occurs due to trauma, and subungual melanoma, a rare form of skin cancer.
The nail bed is the skin beneath the nail plate, made up of two types of tissues: the dermis and the epidermis. It is highly innervated, so removing the nail plate can be extremely painful.
Onycholysis is the medical term for when a nail separates from the nail bed. It is usually not painful, but the underlying cause may be. Treatment options include trimming the nail, treating the underlying cause, and wearing gloves.
