The epidermis is attached to the dermis by tiny longitudinal grooves called matrix crests (cristae matricis unguis). In old age, the nail plate becomes thinner, and these grooves become more visible. The nail sinus (sinus unguis) is where the nail root is; i.e. the base of the nail underneath the skin. It originates from the actively growing tissue below, the matrix.
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.
These layers are modified according to the needs of the specific area of the body. For example, the scalp is covered with thick hair, the palms have particularly thick epidermis and the face contains large numbers of sebaceous glands.. Each square centimetre of skin is said to have approximately:, The skin – a complex set of organs that covers and protects body (3 layers : epidermis , dermis, hypodermis/subcutaneous) Name the functions of the integumentary system Waterproof, cushion, protection, excrete waste, regulate temperature, provide sensory input and synthesize vitamin D.
Histology Guide | Skin, Epidermis – 5 Layers of Epidermis, Outermost Layer & Function, The Anatomy and Function of the Epidermis, Stratum spinosum also referred to as the squamous cell layer, is the thickest layer of the epidermis located just above the basal layer. These are composed of basal cells that have matured into squamous cells, known as keratinocytes. Keratinocytes are responsible for producing keratin, a protective protein that makes up skin, nails, and hair.
a. Epidermis b. Dermis c. Hypodermis d. Both a and b e. None of the above. Answer: b. The skin is composed of two layers : the epidermis and the dermis. Underneath these layers lies the hypodermis. The epidermis is stratified squamous epithelium. The dermis is.
nails are a scalelike modification of the _____ _____ layer of the _____ stratum corneum … 3. arises from the deepest layer of the epidermis and may invade the dermis. melanoma. 1. if metastasized, the deadliest skin cancer … which is think and translucent region about two to three cell layers thick. in response to cold temperatures outside …
Q. The _____ system has been called both a membrane, because it covers the body, and an organ, because it contains several types of tissues.
Which of the following is composed of dense irregular connective tissue? a. Epidermis b. Reticular layer of dermis c. Hypodermis d. Both a and b e. Both b and c. Answer: b. The skin is composed of two layers : the epidermis and the dermis. Underneath these layers lies the hypodermis. The epidermis is stratified squamous epithelium.
