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Hair follicles are part of your skin that are responsible for growing your hair. If you accidentally pull out a strand of your hair and it has a ball (bulb) on the end of it, you didn’t pull out the follicle, and instead, you removed your hair root.
Three essential segments of hair follicles are found on the head: the infundibulum, isthmus, and lower follicle. The lower follicle is also known as the inferior segment and includes the bulb.[1][2]
The hair follicle is an organ found in mammalian skin. [1] It resides in the dermal layer of the skin and is made up of 20 different cell types, each with distinct functions. The hair follicle regulates hair growth via a complex interaction between hormones, neuropeptides, and immune cells. [1]
Hair follicles are responsible for your hair color, hair growth, hair texture, and more. These follicles have three phases of growth, and consistently produce hair throughout your...
Structure and layers of the skin. The hair follicle is a skin appendage located deep in the dermis of the skin. Its function is to produce hair and enclose the hair shaft. A hair follicle consists of two main layers, an inner (epithelial) root sheath and an outer (fibrous) root sheath.
Hair follicles and their keratinized product, hair, are skin appendages present on nearly every part of the body. Areas of the body typically devoid of hair include the palmar and plantar surfaces, lips, and urogenital orifices.
The anatomy of a hair follicle is remarkably intricate, with each part playing a specific role in hair growth and health. By understanding the structure and function of each component, we gain insight into how hair forms, grows, and sheds, as well as why certain factors—like hormones or health conditions—may disrupt the process.
The hair follicle consists of a hair shaft and bulb. It is a down growth of the epidermis, with its long axis usually traveling obliquely through the skin layers. The hair follicle can extend as far as the hypodermis; however, it can also be superficial in the reticular layer of the dermis.
A hair follicle is a stocking-like structure that contains cells and connective tissue and surrounds the root of a hair. It exists within the dermis and the epidermis, the two top layers of the skin. For a helpful visual, think of the hair follicle as a vase and the hair as the stem of a flower.
Hair follicles contain many components and have complex, fine structures. They have a high capacity of self-renewal, and display a periodic growth cycle that takes place continually throughout the life span of mammalian organisms.