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Eponychium

  • ️Sun May 08 2011
Eponychium
Eponychium
Fingernail label.jpg
Fingernail
Gray943.png
Longitudinal section through nail and its nail groove (sulcus). (Eponychium labeled at upper left.)
Gray's subject #234 1067

In human anatomy, the eponychium [Greek epi (on, upon) + onychion (little claw)], also known as the cuticle, is the thickened layer of skin surrounding fingernails and toenails. Beneath the cuticle is a thin layer of a membrane known as the pterygium. The function is to protect the area between the nail and epidermis from exposure to harmful bacteria. The vascularization pattern is similar to that of perionychium.[1]

Similarly, in hoofed animals, the eponychium is the deciduous hoof capsule in fetuses and newborn foals, and is a part of the permanent hoof in older animals.[2]

References

  1. ^ Sangiorgi S, Manelli A, Congiu T, et al. (2004). "Microvascularization of the human digit as studied by corrosion casting". J. Anat. 204 (2): 123–31. doi:10.1111/j.1469-7580.2004.00251.x. PMC 1571248. PMID 15032919. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1571248.
  2. ^ Bragulla, H. (Mar 1991). "The deciduous hoof capsule (Capsula ungulae decidua) of the equine fetus and newborn foal". Anat Histol Embryol. 20 (1): 66–74. PMID 1877762.
v · d · eIntegumentary system (TA A16, TH H3.12, GA 10.1062)
Skin

Basal keratinocyte · Lamina lucida · Lamina densa

Skin fields

Head

campus frontalis, campus parietalis, campus occipitalis, campus temroralis, campus facialis (campus orbitalis, campus nasalis, campus oralis, campus mentalis, campus infraorbitalis, campus buccalis, campus zygomaticus)

Neck

campus cervicalis anterior (campus submandibularis, campus caroticus, campus omotrachealis, campus submentalis), campus sternocleidomastoideus, campus cervicalis posterior (campus omoclavicularis), campus nuchalis

Chest

campus presternalis, campus clavipectoralis, campus pectoralis verus, campus mammarius, campus inframammarius, campus axillaris

Abdomen

campus hypochondriacus, campus epigastricus, campus abdominalis lateralis, campus umbilicalis, campus inguinalis, campus hypogastricus

Perineum

campus analis, campus urogenitalis
Subcutaneous tissue

Panniculus/Pannus (Panniculus adiposus · Panniculus carnosus) · Stratum membranosum · Loose connective tissue · Superficial fascia
Adnexa

Skin glands

Sweat glands: Apocrine sweat gland · Eccrine sweat gland

Sebaceous

Hair shaft

Arrector pili muscle

Pilosebaceous unit

Nail matrix · Nail plate (Lunula)  · Eponychium · Paronychium · Hyponychium

M: INT, SF, LCT

anat/phys/devp

noco(i/b/d/q/u/r/p/m/k/v/f)/cong/tumr(n/e/d), sysi/epon

proc, drug (D2/3/4/5/8/11)

M: SKA

anat/phys/devp

noco/cong/tumr, sysi/epon

proc, drug(D10)

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