follicle

[fol´ĭ-k'l]

a sac or pouchlike depression or cavity. adj., adj follic´ular.

atretic ovarian follicle an involuted ovarian follicle.

dental follicle the structure within the substance of the jaws enclosing a tooth before its eruption; the dental sac and its contents.

gastric f's lymphoid masses in the gastric mucosa.

graafian follicle see graafian follicle.

hair follicle one of the tubular invaginations of the epidermis enclosing the hairs, and from which the hairs grow.

Diagram of a hair follicle showing layers of hair schematically. From Copstead, 1995.

lymph follicle (lymphatic follicle)

1. lymph node.

2. lymphatic nodule (def. 2).

Naboth's f's (nabothian f's) Naboth's cysts.

ovarian follicle the ovum and its encasing cells, at any stage of its development.

primary ovarian follicle an immature ovarian follicle consisting of an immature ovum and the few specialized epithelial cells surrounding it.

primordial ovarian follicle an ovarian follicle consisting of an ovum enclosed by a single layer of cells.

sebaceous follicle a hair follicle with a relatively large sebaceous gland, producing a relatively insignificant hair.

solitary f's

1. areas of concentrated lymphatic tissue in the mucosa of the colon.

2. small lymph follicles scattered throughout the mucosa and submucosa of the small intestine. Called also solitary glands.

thyroid f's discrete cystlike units filled with a colloid substance rich in iodine; they constitute the lobules of the thyroid gland.

vesicular ovarian follicle graafian follicle.

hair fol·li·cle

[TA]

a tubelike invagination of the epidermis from which the hair shaft develops and into which the sebaceous glands open; the follicle is lined by a cellular inner and outer root sheath of epidermal origin and is invested with a fibrous sheath derived from the dermis.

Synonym(s): folliculus pili [TA]

Farlex Partner Medical Dictionary © Farlex 2012

hair follicle

A deep narrow pit that is formed by the tubular infolding of the epidermis and that encloses the root of the hair.

hair fol·li·cle

(hār fol'i-kĕl) [TA]

A tubelike invagination of the epidermis from which the hair shaft develops and into which the sebaceous glands open; the follicle is lined by cellular inner and outer root sheaths of epidermal origin and is invested with a fibrous sheath derived from the dermis.
Synonym(s): folliculus pili [TA] .

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

hair follicle

a sheath of epidermal tissue surrounding the root of a HAIR (2). The follicle is supplied by a sebaceous gland and erectile muscles for the hair. see SKIN.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Hair follicle

A tube-like indentation in the skin from which a single hair grows.

Mentioned in: Hair Transplantation, Sunscreens

Mentioned in

References in periodicals archive

The team fabricated hair beads (HBs) in ushaped wells in a plate array using hair follicle stem cells encapsulated in collagen, a structural protein in skin believed to play an important role in hair follicle generation during embryonic development and hair regrowth throughout life.

Study Points To Possible New Approach To Treating Hair Loss

If the technique is deemed suitable, around 100 hair follicles will be removed from the back of the patient's head using a basic surgical procedure.

World's first hair follicle bank opens to 'make hair loss a thing of the past'; HairClone has launched the world's first hair follicle bank in the UK, where men and women can store frozen hair follicles

In 2005, Nicole Weger and Thomas Schlake's data identified IGF-1 signaling as an important mitogenic and morphogenetic regulator of hair follicle biology [17].

Cashmere growth control in Liaoning cashmere goat by ovarian carcinoma immunoreactive antigen-like protein 2 and decorin genes

After about 20 days, the skin organoids sprouted hair follicles. The roots of the follicles protruded from the skin organoids in all directions.

Discovery May Lead To Treatments Of Skin Disorders, Cancers

Stem cells of the "bulge" can remain in their niche where they self-regenerate, but they can also move down to the hair matrix region, where they become progenitor cells which then form an internal hair follicle and the hair stem [6].

Therapeutic Potential of Stem Cells in Follicle Regeneration

Experimental group and the control group epidermis thickness and diameter of the hair follicles were compared (Table II).

Immunohistochemical and Histopathological Changes in the Skin of Rats after Administration of Lead Acetate/ Alteraciones Inmunohistoquimicas e Histopatologicas en la Piel de Ratas tras la Administracion de Acetato de Plomo

Interestingly, the hair follicle stem cells can also be used for cell based clinical needs, especially in vitiligo.

Now, your hair can help treat skin disorders

Ultraviolet radiation induces oxidative stress in hair follicle stem cells that reduces their vitality and activity, in turn diminishing the health and longevity of the eyelashes.

Enhance eyelashes naturally

Mice treated for five days with one of two JAK inhibitors sprouted new hair within 10 days, greatly accelerating the hair follicle growth phase.

Blocking Enzymes in Hair Follicles Promotes Hair Growth

RepliCel has patents issued for hair follicle mesenchymal stem cells and their usage in Japan, the US, Australia and the EU.

Shiseido to open hair regeneration center

Washington, April 2 ( ANI ): Researchers have showed how hair growth activated fat tissue growth in the skin below the hair follicle could lead to the development of a cream to dissolve fat.

Hair chemical cream can help keep paunches in control