Thickened epithelium underlying the free edge of the nail plate

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Hyponychium

Nail anatomy

Details
Identifiers
Latin| Hyponychium
TA98| A16.0.01.011
TA2| 7073
FMA| 77860
Anatomical terminology

[edit on Wikidata]

The hyponychium is the area of epithelium, particularly the thickened portion, underlying the free edge of the nail plate on the nail. Its proximal border is immediately distal to distal limit of nail bed—a.k.a. the onychodermal band (the line along the interface of the nail bed and the nail plate). Its distal border the free edge of the nail plate—or where that edge would project downwards onto the epidermis.

It is sometimes called "the quick" (in its archaic meaning of "living"), as in the phrase cut to the quick.[1]

## See also[edit]

* Eponychium

## References[edit]

1. ^ "Cut to the quick". Grammarist. 27 September 2018.

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Skin and related structures

Skin|

| Epidermis|

* Stratum corneum
* Stratum lucidum
* Stratum granulosum
* Stratum spinosum
* Malpighian layer
* Stratum basale

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Basement membrane|

* Basal keratinocyte
* Lamina lucida
* Lamina densa

Dermis|

* Papillary
* Dermal papillae
* Reticular

Subcutaneous tissue|

* Panniculus/Pannus (Panniculus adiposus
* Panniculus carnosus)
* Membranous layer
* Loose connective tissue
* Superficial fascia

Adnexa|

| Skin glands|

* Sweat glands: Apocrine sweat gland
* Eccrine sweat gland
* Sebaceous

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Hair|

| Root sheath|

* Outer root sheath
* Inner root sheath
* Henle's layer
* Huxley's layer

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Hair shaft|

* Cuticle
* Cortex
* Medulla
* Bulb with matrix cells
* Hair follicle

Muscle|

* Arrector pili muscle

Pilosebaceous unit|

* Hair sebaceous gland

Nail|

* Nail matrix
* Nail plate
* Lunula
* Eponychium
* Paronychium
* Hyponychium

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* Terminologia Anatomica

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