Anatomy of the nail

Discussion in 'Health, safety and unaturalé' started by Lellipop, Aug 31, 2006.

  1. Lellipop
    Nails grow all the time, but their rate of growth slows down with age and poor circulation. Fingernails generally grow faster than toenails at a rate of ~3mm per month. It takes an average of 6 months for a nail to grow from the matrix to the free edge. Toenails grow about 1 mm per month and take 12-18 months to be completely replaced. Interestingly enough, the nail plates grow at about the same speed continents move!

    Nail Structure

    The structure we know of as the nail is divided into six specific parts - the matrix, the nail bed, the nail plate, the eponychium, lateral folds and the hyponychium. Each of these structures has a specific function, and if disrupted can result in an abnormal appearing fingernail.

    The Matrix

    This is the most important part of the natural nail plate as it is solely responsible for incubating new nail plate cells. Any damage to the matrix will result in permanent damage to the natural nail plate. The matrix lies beneath the proximal fold (at the base of the nail plate) and is several millimeters in length. As new nail plate cells are incubated, they emerge from the matrix round and white. This in turn pushes the old nail plate cells upward and outward slowly compressing older cells before them. After several weeks, the round, white nail plate cells become compressed, flat and translucent which is how you can see the pink colouration from the millions of capillaries in the nail bed. An interesting and important point to note is that the proximal (closest to you) end of your matrix produces the top layer of the natural nail plate while the distal (furthest point from you) end of the matrix produces the bottom portion of the natural nail plate. The distal end of the matrix is often seen as a white moon called the lunula. The lunula is the distal end of the matrix and the round white cells are the reason for the lunula being white in colouration.

    Nail Bed

    The nail bed is comprised of two types of tissues: The epidermis and the dermis. The dermis is living tissue and contains capillaries and glands (i.e. sebaceous and suderiferous - oil and sweat glands respectively). The dermis is fundamentally fixed to the bone and is stationary. An interesting and important feature is that this dermal tissue contains many 'grooves' that run the length of the nail bed.
    The Epidermal tissue is a special type of epidermis called the bed epithelium. The bed epithelium non living tissue that is produced at the distal end of the matrix. While this skin is produced, it becomes partially 'fused' with newly formed nail plate. This bed epithelium then grows out with the natural nail plate, one side stuck to the bottom of the natural nail plate and the other side stuck in the 'grooves' of the dermis (the true nail bed).

    Nail Plate

    The nail plate is the actual fingernail, made of semi-translucent keratin. The pink appearance of the nail comes from the capillaries beneath the nail.

    The Eponychium

    The eponychium is most often mistakenly called the cuticle (which it is not!). Less frequently, it is called pterygium (which is a serious nail disorder!). The eponychium is the end of the proximal fold that appears to end at the base of the natural nail. The eponychium does not end there, it in fact folds back upon itself, hence the reason it is refered to as a fold.
    Where it folds back upon itself, it sheds an epidermal layer of skin onto newly formed natural nail plate. This epidermal layer of non living skin then 'rides out' attached to the surface of the natural nail plate. This non living (almost invisible) layer of skin is the cuticle that is removed during manicuring. This relationship between the cuticle and the eponychium creates a perfect seal that keeps pathogens away!
    Though the cuticle is removed during nail services, it can not be removed with nippers, only with a pusher and professional cuticle remover products. Cutting or clipping of living tissue (in this case the eponychium) should always be avoided unless you want to risk a serious nail infection like paronychia.
    It is important to always remember to not push back the eponychium aggresively. Doing so tears the eponychium away from the cuticle and increases the risk of an infection.

    The lateral folds

    The lateral folds are a natural extension of the proximal fold and the eponychium and help guide the nail plate out to the free edge.

    The Hyponychium

    The hyponychium is the area between the nail plate and the fingertip. It is the junction between the free edge of the nail and the skin of the fingertip.
  2. melissaq
    I'v had to book mark this page ......thanks .....:)
  3. Vetty
    Cheers Lell, I'm not a newbie as such but this is still really helpful info!
  4. clara doon
    good info thank you xx
  5. ValencianNails
    excellent info Lellipoooh :D
  6. Maisie
    That was brilliant, thank you :hug:
  7. velouriapixi

    Im starting a nail course in September and although ive done manicure and pedicure before, its been a while and its good to brush up on all the stuff you forget, its realy helpfull information :Grope:
  8. velouriapixi
    Thanks Lelli
    Very helpfull information:lol:
  9. The Geek
    Staff Member
    Just as an FYI - I retweaked the article as I thought it is a great addition to the site - but wanted to clarify a couple points in it. I also deleted comments regarding its content as it looks wierd to have them there now that the issues have been sorted.

    Hope you dont mind me doing the tweaking, its a HUGE subject and I thought this was a great overview to have.

    Thanks again.
    In My 3rd Week At College, And Have My First Test! I Found This Really Helpful And Easy To Understand. Any Tips On How To Retain The Information, As I Am A Bit Rusty(mature Student!)
  11. Sassy Hassy
    As a mature student myself I know how it feels to find it hard to retain info! So what I would do is when working on the nail actualy refer to the parts of the nail as I worked on them, makes more sense to actualy see it there in front of you.
  12. bettyboo
    Hi, this is a great article. But i am having a bit of trouble. I am at this moment writing my essay on Nail Anatomy. My course folder states different than what you have written on this nail anatomy. For example my folder states that the eponychium IS the cuticle. PLease help i am confused????? Should i use your version of nail anatomy as my research or should i stick to folder contents. Thanks.B*Bxx
  13. geeg
    The eponychium is NOT the cuticle.
    The eponychium is living tissue and cuticle is NON living tissue.
    Your anatomy book is incorrect and out of date (something we see all the time).
    The information you have recieved here is correct and it needs pointing out to your tutor that you are using this information.
    Hope this helps.
  14. Bekii17
   just going in to my 4th week @ college n im exactly the same, college tells me not to look on the internet as to it tells you in a different text and its easy to get confused if i was you id just stick to what college tels you that way you can't go wrong n fail ur exams cos colleges do things a different way but once your qualified you pick up things n tend to do your own lil routine..!!

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