Hyponychium

Hyponychium is the area of epidermis, located under the free edge of the distal part of a nail. It is the junction between the free edge of the nail and the skin of the fingertip, providing a waterproof barrier.

Anatomy

The hyponychium is the skin located beneath the nail plate at the junction between the free edge of the nail and the skin of the fingertip. It forms a seal that protects the nail bed. The equivalent structure in an animal's paw is the subunguis.

Function

The primary function of the hyponychium is to protect the nail bed from infection and trauma. It acts as a barrier to prevent bacteria, fungi, and other pathogens from accessing and infecting the nail bed.

Clinical significance

In some diseases and conditions, the hyponychium can become overgrown, a condition known as hyperkeratosis. This can cause discomfort and can interfere with normal nail growth. Some common causes of hyperkeratosis include fungal infections, psoriasis, and chronic trauma to the nail.

See also

• Nail (anatomy)
• Nail disease
• Hyperkeratosis

References

Hyponychium Resources
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