Αποτελέσματα Αναζήτησης
28 Σεπ 2024 · A nail is a hard, keratinized structure found at the tips of the fingers and toes in humans and many other animals. Composed primarily of the protein keratin, nails grow from the nail matrix, which is located beneath the cuticle.
Normal Nail Anatomy, Normal Nail Histology, and Common Reaction Patterns. Aldo González-Serva. 4.1. Introduction – 41. 4.2. Functions of the Nail – 41. 4.3 Components of the Nail Unit – 41. 4.3.1 Spatial Disposition of Components of the Nail – 42. 4.3.2 Modes of Keratinization of the Epithelial Components of the Nail – 43.
Nail growth Definition of the nail matrix. In the first section we have attempted to define the matrix in anatomical terms, assisted by histology and immunohistochemistry illustrating regional differentiation within the nail unit and in particular with respect to keratin expression.
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.
Nail growth •The cells, onychocytes, in the matrix reproduce (mitosis) to form the nail plate. •Cells need a good supply of oxygen and nutrients. •As the cells multiply they are pushed up the nail bed. •As they are pushed up, the cells die and harden.
the nail folds, origin at the matrix and attachment to the nail bed. It ends at a free edge distally, overlying the hyponych-ium. These structures are illustrated in Figures 1.1 and 1.2 . Definitions of the components of the nail unit are as follows. • Nail plate (nail): durable keratinized structure which continues growing throughout life.
1 Ιαν 2016 · The lateral nail grooves complete the bezel of the nail. They are lined by the lateral folds. The visible part of the nail ends with a free edge, which owes its whitish color to the underlying presence of air.
