뒤로Anatomy of Hair and Nails
이 집합의 용어 (20)
Hair provides protection, sensory input, and helps regulate body temperature.
The hair follicle includes the bulb, root, and shaft.
Hair growth occurs in the hair bulb at the base of the follicle.
The matrix contains actively dividing cells that produce the hair shaft.
The hair shaft is made of keratinized dead cells that extend above the skin surface.
The hair shaft has the medulla (core), cortex (middle), and cuticle (outer layer).
The cuticle protects the inner layers and provides strength to the hair.
Nails are made of hard keratinized epithelial cells.
The nail matrix is the growth zone where new nail cells are produced.
The lunula is the visible white crescent-shaped area at the nail base.
The nail cuticle protects the matrix from infection.
The nail bed is the skin beneath the nail plate that supports nail growth.
Nails grow as new cells are produced in the matrix and pushed outward.
Hair grows from follicles embedded in skin, while nails grow from the matrix under the proximal nail fold.
Keratin provides strength and resilience to both hair and nails.
Sebaceous glands secrete oils that lubricate hair and skin.
The root is the part of hair below the skin, and the shaft is the visible part above the skin.
Melanocytes produce pigment that gives hair its color.
The eponychium is the skin fold at the base of the nail, also called the cuticle.
The hyponychium is the thickened skin under the free edge of the nail plate.