Caleb Foster
The accessory nail of the fifth toe, also known as a double nail of the fifth toe (DNFT) or a petaloid toenail, is a physical trait of the small toe, where a minuscule sixth toenail is present in the outer corner of the nail situated on the smallest toe. The additional nail can be cut with a nail clippers and its occurrence is considered common but underreported. The cause is poorly understood due to a lack of research, but genome-wide scans indicate that it is a heritable trait.
| Characteristics | Values |
|---|---|
| Name | Accessory nail of the fifth toe, double nail of the fifth toe (DNFT), petaloid toenail |
| Description | A minuscule sixth toenail is present in the outer corner of the nail situated on the smallest toe |
| Prevalence | Common but underreported |
| Length | 2-7mm |
| Treatable | Can be cut with a nail clipper |
| Inheritance | Heritable trait, possibly autosomal dominant |
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What You'll Learn
Accessory nail of the fifth toe
The accessory nail of the fifth toe, also known as a double nail of the fifth toe (DNFT) or a petaloid toenail, is a physical trait of the small toe. It is characterised by the presence of a minuscule sixth toenail in the outer corner of the nail on the smallest toe. The additional nail averages 2-7 mm in length and can be cut with a nail clipper. Although its occurrence is considered common, it is often underreported and understudied. The trait was first described in a 1969 paper by M. Hundeiker.
The accessory nail of the fifth toe can be observed on either one or both feet, with a lengthwise separation of the toenail on the corner of the smallest toe. The smaller sixth toenail separates from the main toenail on the outermost side of the foot, protruding outwards from the corner. The entire nail of the small toe is usually short and wide, and both nails often share the same nail bed.
The cause of this trait is not well understood due to a lack of research. However, genome-wide scans indicate that it is likely a heritable trait, possibly autosomal dominant. The wide variation in the size and structure of the accessory nail suggests that it may not follow a simple pattern of inheritance and could instead be influenced by multiple genes with minor genetic effects. In some cases, the accessory nail may be associated with an abnormal protrusion or distortion of the fifth distal phalanx, or the splaying or rotation of the toe or entire foot.
Interestingly, there is a legend associated with the accessory nail of the fifth toe. According to the story, the Henan people, led by Yin Wang, attacked the Qiang and abducted a Qiang woman. As she tried to escape, Yin Wang stabbed her in the abdomen, resulting in a scar on the small toe of her foot. Her descendants were then born with double nails on their small toes.
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Double nail of the fifth toe (DNFT)
The accessory nail of the fifth toe, also known as a double nail of the fifth toe (DNFT) or a petaloid toenail, is a physical trait of the small toe. A minuscule sixth toenail is present in the outer corner of the nail situated on the smallest toe. The trait can be observed on either one or both feet where there is a lengthwise separation of the toenail on the corner of the smallest toe. The smaller sixth toenail separates from the main toenail on the outermost side of the foot, and protrudes outwards from the corner. The additional nail can be cut with a nail clipper and averages 2-7mm in length. The entire nail of the small toe is usually short and wide, and both nails often share the same nail bed. The cause is poorly understood due to a lack of research, but genome-wide scans indicate that it is a heritable trait, and could be autosomal dominant. However, the wide variance in the size and structure of the accessory nail indicates that the trait may not follow a Mendelian pattern of inheritance, and may instead be a complex trait affected by multiple genes with minor genetic effects. In some cases, the accessory nail presents with an abnormal protrusion or distortion of the fifth distal phalanx, or the splaying or rotation of the toe or entire foot. The trait may be a mild form of hexadactyly.
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Petaloid toenail
Small toenails can refer to the accessory nail of the fifth toe, also known as a double nail of the fifth toe (DNFT) or a petaloid toenail. This is a physical trait of the small toe, where a minuscule sixth toenail is present in the outer corner of the nail situated on the smallest toe. The trait can be observed on either one or both feet where there is a lengthwise separation of the toenail on the corner of the smallest toe. The smaller sixth toenail separates from the main toenail on the outermost side of the foot, and protrudes outwards from the corner. The accessory nail was first described in a 1969 paper by M. Hundeiker.
The cause of this trait is poorly understood due to a lack of research, but genome-wide scans indicate that it is a heritable trait, and could be autosomal dominant. The wide variance in the size and structure of the accessory nail indicates that the trait may not follow a Mendelian pattern of inheritance, and may instead be a complex trait affected by multiple genes with minor genetic effects. In some cases, the accessory nail presents with an abnormal protrusion or distortion of the fifth distal phalanx, or the splaying or rotation of the toe or entire foot. The trait may be a mild form of hexadactyly.
The occurrence of the accessory nail is considered common but underreported. The entire nail of the small toe is usually short and wide, and both nails often share the same nail bed. The additional nail averages 2–7 mm (0.079–0.276 in) in length and can be cut with a nail clipper.
In one story, the Henan people, led by Yin Wang, attacked the Qiang and abducted a Qiang woman, who later tried to escape. Yin Wang stabbed her in the abdomen as she tried to escape, so she gave birth to two children with a scar on the small toe of the foot. Her descendants were born with double nails on their small toes.
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The prevalence of the trait
The accessory nail of the fifth toe, also known as a double nail of the fifth toe (DNFT) or a petaloid toenail, is a physical trait where a minuscule sixth toenail is present in the outer corner of the nail situated on the smallest toe. The occurrence of this trait is considered common but underreported. The entire nail of the small toe is usually short and wide, and both nails often share the same nail bed. The accessory nail was first described in a 1969 paper by M. Hundeiker. The trait can be observed on either one or both feet where there is a lengthwise separation of the toenail on the corner of the smallest toe. The smaller sixth toenail separates from the main toenail on the outermost side of the foot, and protrudes outwards from the corner. The cause of this trait is poorly understood due to a lack of research, but genome-wide scans indicate that it is a heritable trait, and could be autosomal dominant. However, the wide variance in the size and structure of the accessory nail indicates that the trait may not follow a Mendelian pattern of inheritance, and may instead be a complex trait affected by multiple genes with minor genetic effects.
The accessory nail of the fifth toe is a benign condition that does not typically cause any pain or discomfort. However, it is important to note that in some cases, the accessory nail can present with an abnormal protrusion or distortion of the fifth distal phalanx, or the splaying or rotation of the toe or entire foot. These variations can range from mild to more noticeable, and individuals with these presentations may seek medical attention for cosmetic or functional reasons.
The accessory nail of the fifth toe is a fascinating example of the diversity and complexity of human physical traits. While it may go unnoticed or be considered a minor peculiarity by some, it serves as a reminder of the intricate workings of genetics and the unique characteristics that can arise from them.
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The heritability of the trait
Small toenails are a physical trait of the small toe, where a minuscule sixth toenail is present in the outer corner of the nail situated on the smallest toe. This is known as the accessory nail of the fifth toe, or a double nail of the fifth toe (DNFT). The trait can be observed on either one or both feet, where there is a lengthwise separation of the toenail on the corner of the smallest toe. The smaller sixth toenail separates from the main toenail on the outermost side of the foot, and protrudes outwards from the corner. The occurrence of this trait is considered common but underreported. The entire nail of the small toe is usually short and wide, and both nails often share the same nail bed.
The cause of small toenails is poorly understood due to a lack of research, but genome-wide scans indicate that it is a heritable trait, and could be autosomal dominant. However, the wide variance in the size and structure of the accessory nail indicates that the trait may not follow a Mendelian pattern of inheritance, and may instead be a complex trait affected by multiple genes with minor genetic effects. In some cases, the accessory nail presents with an abnormal protrusion or distortion of the fifth distal phalanx, or the splaying or rotation of the toe or entire foot. The trait may be a mild form of hexadactyly.
The accessory nail of the fifth toe was first described in a 1969 paper by M. Hundeiker. It is believed to be a physical trait of the small toe, where a minuscule sixth toenail is present in the outer corner of the nail. The trait can be observed on either one or both feet, and the smaller sixth toenail separates from the main toenail on the outermost side of the foot. The occurrence of this trait is considered common but underreported, and it is believed that the entire nail of the small toe is usually short and wide.
The Henan people, led by Yin Wang, attacked the Qiang and abducted a Qiang woman, who later tried to escape. Yin Wang stabbed her in the abdomen, and as a result, she gave birth to two children with a scar on the small toe of the foot. Her descendants were born with double nails on their small toes.
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Frequently asked questions
The accessory nail of the fifth toe, also known as a double nail of the fifth toe (DNFT) or a petaloid toenail, is a physical trait of the small toe, where a minuscule sixth toenail is present in the outer corner of the nail situated on the smallest toe.
The occurrence of the accessory nail of the fifth toe is considered common but underreported.
The additional nail averages 2-7mm in length.
Yes, the additional nail can be cut with a nail clipper.
