The hair shaft consists of the medulla, cortex. Immediately above the matrix cells, hair shaft cells begin to express specific hair shaft keratins in the prekeratogenous zone [23]. The medulla is a central part of larger hairs, such as beard hairs, and a specific keratin expressed in this layer of cells can be controlled by […]
Category: COSMETIC APPLICATIONS. OF LASER AND LIGHT-. BASED SYSTEMS
Hair Follicle Anatomy
The hair follicle can be divided into three anatomical compartments: the infundibulum, isthmus, and the inferior segment. The upper follicle is permanent, whereas the lower follicle, the inferior segment, regenerates with each hair follicle cycle. The infundibulum extends from the skin surface to the sebaceous duct. The isthmus, the permanent middle portion, extends from the […]
The Functions of Hair
Mammalian skin produces hair everywhere except for the glabrous skin of the lips, palms, and soles. Although obvious in most mammals, human hair growth is so reduced with tiny, virtually colourless vellus hairs in many areas, that we are termed the “naked ape”. Externally hairs are thin, flexible tubes of dead, fully keratinised epithelial cells; […]
BASIC TECHNOLOGY AND TARGETS FOR LIGHT-BASED SYSTEMS
1 The Biology of Hair Growth 1.1.1.1 Gurpreet S. Ahluwalia (ed.), Cosmetic Applications of Laser and Light-Based Systems, 3-35, © 2009 William Andrew Inc. 1.2 Treatment of Hair Growth Disorders 25 References 26 1.1 Introduction The hair follicle is a highly dynamic organ found only in mammals. Although frequently overlooked, the follicle is fascinating from […]
COSMETIC APPLICATIONS. OF LASER AND LIGHT-. BASED SYSTEMS
Gurpreet S. Ahluwalia Though cosmetic science dates back nearly 4000 years, it is in the last two to four decades that the industry has made the most progress by coming up with high potency bioactive ingredients now part of cosmeceuticals, innovative topical drugs for beauty treatments, minimally invasive injectables such as Botox® Cosmetic and dermal […]