Is the nail bed epidermis?
The nail bed, is a specialised form of skin epithelium, and has the same four layers of the epidermis of skin, with the nail plate being analogous to the stratum corneum layer. The nail plate is made up of tightly packed, hard, keratinized epidermal cells.
Which layer of epidermis forms the nail bed?
The nail body is composed of densely packed dead keratinocytes. The epidermis in this part of the body has evolved a specialized structure upon which nails can form. The nail body forms at the nail root, which has a matrix of proliferating cells from the stratum basale that enables the nail to grow continuously.
What is the nail bed made of?
The part that we call the nail is technically known as the “nail plate.” The nail plate is mostly made of a hard substance called keratin. It is about half a millimeter thick and slightly curved. The nail is firmly attached to the nail bed beneath it.
What is the epithelium of the nail bed?
The nail bed sits underneath the nail plate, spanning between the lunula and the hyponychium. Histologically, the nail bed epithelium is composed of a monocellular basal layer, a spinous layer, and, like the nail matrix, is devoid of a stratum granulosum.
Where is the dermis?
skin
The dermis is the second and thickest layer of the three major layers of skin, located between the epidermis and subcutaneous tissues, also known as the subcutis and the hypodermis. The skin was previously viewed as a body part that protects us from the elements.
What is true about the epidermis and the dermis?
What is true about both the epidermis and the dermis? Epidermis is avascular and dermis is richly vascularized. These glands are found all over the skin except in the palms of the hands and soles of the feet. They produce an oily substance that lubricates skin and hair.
What is the cuticle of the nail?
The cuticle is a layer of clear skin located along the bottom edge of your finger or toe. This area is known as the nail bed. The cuticle function is to protect new nails from bacteria when they grow out from the nail root. The area around the cuticle is delicate.
Is nail a bone or cartilage?
The nail plate (corpus unguis) is the hard part of the nail, made of translucent keratin protein. Several layers of dead, compacted cells cause the nail to be strong but flexible. Its (transverse) shape is determined by the form of the underlying bone. In common usage, the word nail often refers to this part only.
Are eponychium and cuticle the same?
In human anatomy, the eponychium is the thickened layer of skin at the base of the fingernails and toenails. It can also be called the medial or proximal nail fold. The eponychium differs from the cuticle; the eponychium comprises live skin cells whilst the cuticle is dead skin cells.
Is the nail plate the same as the epidermis?
The nail bed, is a specialised form of skin epithelium, and has the same four layers of the epidermis of skin, with the nail plate being analogous to the stratum corneum layer. The nail plate is made up of tightly packed, hard, keratinized epidermal cells.
Is there such a thing as a nail bed matrix?
INTRODUCTION Nail investigators have never really believed that there is a nail bed matrix (NBM), separate from the nail plate matrix (NPM).
What is the color of the nail bed?
The nail bed matrix (NBM) produces the nail bed (NB) epidermis, green color. Note that the NBM is underneath the keratogenous zone of the NPM and cannot be seen clinically because it is obstructed from view by the whitish lunula.
Where are the stem cells in the nail bed?
The nail bed (NB) has its own matrix that originates from distinctive stem cells. The nail bed matrix stem cells (NBMSC) lie immediately distal to the nail plate (NP) matrix cells and are covered by the keratogenous zone of the most distal NPM (LUNULA).