The hairline refers to the boundary or line where hair begins to grow on the forehead. It varies greatly from person to person and can be influenced by various factors…
Hair follicles are tiny, pocket-shaped structures in the skin from which hair grows. Each follicle contains the hair root, which consists of protein cells. Using nutrients from the bloodstream, they produce…
The hair cortex, or cortex, is the main part of the hair shaft and lies between the outer layer, the cuticle, and the inner core, the medulla (if present). The cortex makes up the largest part…
The hair cortex, also called the hair shaft cortex, is the main part of the hair shaft and lies between the outer layer (cuticle) and the inner core (medulla, if present). The cortex makes up the largest part…
The hair shaft is the visible part of the hair that protrudes from the skin. It consists of dead tissue made up of keratinized cells that contain no living cells or blood vessels…
A hair transplant is a surgical procedure in which hair follicles are transplanted from one part of the body, known as the "donor area," to bald or thinning areas of the head, known as the "recipient area."
Hair types are often classified based on the texture and shape of the hair. The most widely used classification was developed by hairdresser Andre Walker and comprises four main types: Type…
The hair root is the part of the hair located beneath the skin and embedded in the hair follicle. It is responsible for hair growth and consists of…
The hair bulb, also known as the hair root, is the lower part of the hair root, located in the deepest region of the hair follicle. It has an onion-shaped structure and surrounds the dermal papilla…
Witch hair, also known as terminal hair or simply strong, thick hair, refers to the longest, thickest, and darkest hairs on the body. The term is sometimes used colloquially to describe unusual…
Hirsutism is a condition characterized by excessive growth of dark, coarse hair in women, following a male pattern. This can include facial hair growth (chin and upper lip),…
Hormones are chemical messengers produced by the body's endocrine glands and released into the bloodstream. They travel throughout the body and act on specific target cells or organs…
In the context of hair removal, the abbreviation "HR" typically stands for "Hair Removal". A specific "HR method" can refer to various technologies and procedures used to remove unwanted body hair…
Hypertrichosis is a rare condition characterized by excessive hair growth in areas of the body where little to no hair normally grows. This excessive hair growth can be either congenital (from birth…
Hypotrichosis describes a condition characterized by unusually sparse hair growth. Unlike alopecia, where hair falls out from previously normal hair, hypotrichosis is caused by…
Curly hair, often described as type 4 in the hair type classification, is characterized by a very tight and defined curl, ranging from fine and thin to thick and coarse…
Lanugo hair refers to the fine, soft, and usually colorless hair that covers the body of a fetus in the womb. This type of hair begins to develop around the fourth month of pregnancy and…
The medulla refers to the innermost part of the hair shaft and varies in size and structure depending on the hair type. It consists of a soft, loose arrangement of cells and air chambers that provide the hair with additional…
The arrector pili muscle (plural: arrector pili muscles) is a small, smooth muscle connected to each hair follicle in the human body. The main function of this muscle is to pull the hair…
The papilla is a term used in various contexts of biology and medicine to describe a small, cone- or wart-shaped structure. In the context of hair biology...
