nails definition anatomy

[4] The eponychium is the end of the proximal fold that folds back upon itself to shed an epidermal layer of skin onto the newly formed nail plate. Other examples of ungues include the claw, hoof and talon. The width and thickness of the nail plate is determined by the size, length, and thickness of the matrix, while the shape of the fingertip bone determines if the nail plate is flat, arched, or hooked. Several layers of dead, compacted cells cause the nail to be strong but flexible. Iron-deficiency anemia can lead to a pale color along with a thin, brittle, ridged texture. [5]

Actual growth rate is dependent upon age, sex, season, exercise level, diet, and hereditary factors.

Like all skin, it is made of two types of tissues: the deeper dermis, the living tissue which includes capillaries and glands,[10][unreliable source?] to be very awkward or clumsy in handling or holding things. Though the cells of the matrix are alive, the cells that make up the nails are dead. [4][10] In old age, the nail plate becomes thinner, and these grooves become more visible.

She put her finger on the cause of our financial trouble. The nail consists of the nail plate, the nail matrix and the nail bed below it, and the grooves surrounding it.

Anatomy of nails. For the construction technique, see. The current record-holder for men, according to Guinness, is Shridhar Chillal from India who set the record in 1998 with a total of 20 feet 2.25 inches (615.32 cm) of nails on his left hand. [33], In contrast to nails, claws are typically curved ventrally (downwards in animals) and compressed sideways.

[16] Fingernails require three to six months to regrow completely, and toenails require twelve to eighteen months. Discoloration, thinning, thickening, brittleness, splitting, grooves, Mees' lines, small white spots, receded lunula, clubbing (convex), flatness, and spooning (concave) can indicate illness in other areas of the body, nutrient deficiencies, drug reaction or poisoning, or merely local injury. body of nail: [TA] the exposed portion of the nail distal to its root. to point out or describe exactly; to identify.

The matrix produces cells that become the nail plate. The nail grows from a deep groove in the dermis of the skin. The lunula ("small moon") is the visible part of the matrix, the whitish crescent-shaped base of the visible nail.

Manicures (for the hands) and pedicures (for the feet) are health and cosmetic procedures to groom, trim, and paint the nails and manage calluses.

Insufficient vitamin B12 can lead to excessive dryness, darkened nails, and rounded or curved nail ends. In tree shrews, all digits have claws and, unlike most primates, the digits of their feet are positioned close together, and therefore, the thumb cannot be brought into opposition (another usually distinguishing feature of primates).[33]. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.

[citation needed] Common organisms causing nail infections include yeasts and molds (particularly dermatophytes).[27]. [6][unreliable source?] Finally, the nail functions as a tool enabling a so-called "extended precision grip" (e.g.

Anyone know why it hurts so much when you smash one of your finger nails?

They are continuous, and some references view them as one entity; in this classification, the names eponychium, cuticle, and perionychium are synonymous. Delayed return to pink color can be an indicator of certain shock states such as hypovolemia.[23][24]. It is sometimes called the quick as in the phrase 'cutting to the quick'.

A common nail disorder is an ingrowing toenail (onychocryptosis). Nails correspond to claws found in other animals. The ends of the nails usually consist only of the "superficial", hardened layer and are not pointed like claws. The nail then acts as a counter-force when the end of the finger touches an object, thereby enhancing the sensitivity of the fingertip,[14] although the nail itself has no nerve endings. DNA profiling is a technique employed by forensic scientists on hair, fingernails, toenails, etc.

[6], The nail sinus (sinus unguis) is where the nail root is;[4] i.e. [4], The nail wall (vallum unguis) is the cutaneous fold overlapping the sides and proximal end of the nail. The free margin (margo liber) or distal edge is the anterior margin of the nail plate corresponds to the abrasive or cutting edge of the nail. A study of the fingertip morphology of four small-bodied New World monkey species indicated a correlation between increasing small-branch foraging and: This suggests that whereas claws are useful on large-diameter branches, wide fingertips with nails and epidermal ridges were required for habitual locomotion on small-diameter branches. This makes the capillaries in the nail bed below visible, resulting in a pink color.

piedurties ar pirkstiem; aiztikt; aptaustīt.
In fact, it is much more permeable than the skin,[20] and the composition of the nail includes 7–12% water. [28] Like any other nail, it can be cut using a nail clipper. يَضَع إصْبَعَه على، يعيِّن، يَصِف، يتَعَرَّف, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content. Filing is also recommended, as to keep nails from becoming too rough and to remove any small bumps or ridges that may cause the nail to get tangled up in materials such as cloth.[26].

He cut his fingertip by accident while preparing the salad. Q. what causes ridges in fingernails center of nail is splitting down the middle toward the nail bed. Iron deficiency in general may cause the nails to become flat or concave, rather than convex.[30]. the mark made by the tip of the finger, often used by the police.

[5][unreliable source?]

As new nail plate cells are made, they push older nail plate cells forward; and in this way older cells become compressed, flat, and translucent.

[18] Contrary to popular belief, nails do not continue to grow after death; the skin dehydrates and tightens, making the nails (and hair) appear to grow.
The thin, horny, transparent plate covering the upper surface of the end of a finger. They require various tools such as cuticle scissors, nail scissors, nail clippers, and nail files.

Nail, in the anatomy of humans and other primates, horny plate that grows on the back of each finger and toe at its outer end.

The hyponychium (informally known as the "quick")[11] is the epithelium located beneath the nail plate at the junction between the free edge and the skin of the fingertip. The lateral margin (margo lateralis) lies beneath the nail wall on the sides of the nail, and the nail groove or fold (sulcus matricis unguis) are the cutaneous slits into which the lateral margins are embedded.[4].

It is not visible in some individuals while it is highly prominent on others.

pulling out a splinter in one's finger), and certain cutting or scraping actions. Q. His longest nail, on his thumb, was 4 feet 9.6 inches (146.3 cm) long. Insufficient intake of both vitamin A and B results in fragile nails with horizontal and vertical ridges.

Essential fatty acids play a large role in healthy skin as well as nails.

Standard hygiene and sanitation procedures avoid transmission. [6] In common usage, the word nail often refers to this part only. Some over-the-counter vitamin supplements such as certain multivitamins and biotin may help in growth of strong nails, although this is quite subjective.[29].

[32], The nail is an unguis, meaning a keratin structure at the end of a digit. imati prste u necemu, biti umiješan u nešto, มีส่วนเกี่ยวข้องหรือเข้าไปเกี่ยวข้องกับทุกสิ่งที่เกิดขึ้น, her işte parmağı olmak, her tarakta bezi olmak. The record-holder for women is Lee Redmond of the U.S., who set the record in 2001 and as of 2008 had nails with a total length on both hands of 28 feet (850 cm), with the longest nail on her right thumb at 2 feet 11 inches (89 cm).

The place where a nail technician works may be a nail salon or nail shop or nail bar.

[21] However, this test is not considered reliable in adults. reduced flexor and extensor tubercles (attachments areas for finger muscles on bones).

The cuticle is the semi-circular layer of almost invisible dead skin cells that "ride out on" and cover the back of the visible nail plate while the eponychium is the fold of skin cells that produces the cuticle.



Compared to claws, nails are flat, less curved, and do not extend far beyond the tip of the digits. Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content. [9][unreliable source?] [34] The needle-clawed bushbaby (Euoticus) has keeled nails (the thumb and the first and the second toes have claws) featuring a central ridge that ends in a needle-like tip. The best way to care for nails is to trim them regularly.

A., Savin, J., & Dahl, M. V. (2002). The thief wiped his fingerprints off the safe. [2], The matrix, sometimes called[3] the matrix unguis, keratogenous membrane, nail matrix, or onychostroma, is the tissue (or germinal matrix) which the nail protects.

It is just under the free edge, in that portion of the nail where the nail bed ends and can be recognized in fair-skinned people by its glassy, greyish colour. The nail bed is the skin beneath the nail plate. A nail is a horn-like keratinous plate at the tip of the fingers and toes in most primates.

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