follicle

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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)
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.

fol·li·cle

(fol'i-kĕl), [TA]
1. A more or less spheric mass of cells usually containing a cavity.
2. A crypt or minute cul-de-sac or lacuna, such as the depression in the skin from which the hair emerges.
Synonym(s): folliculus [TA]
[L. folliculus, a small sac, dim. of follis, a pair of bellows]

follicle

(fŏl′ĭ-kəl)
n.
1. Anatomy
a. A small bodily cavity or sac.
b. A crypt or minute cul-de-sac or lacuna, such as the depression in the skin from which the hair emerges.
c. An ovarian follicle.
d. A spherical mass of cells usually containing a cavity.
2. Botany A dry, single-chambered fruit that splits along only one seam to release its seeds, as in larkspur and milkweed.

follicle

Anatomy
1. A sac, outpouching, cavity. See Hair follicle.
2. Lymphoid follicle. See Lollipop follicle, Target follicle Reproduction medicine Ovarian follicle A structure in the ovaries which contains a developing egg. See Graafian follicle.

fol·li·cle

(fol'i-kĕl) [TA]
1. A more or less spheric mass of cells usually containing a cavity.
2. A crypt or minute cul-de-sac or lacuna, such as the depression in the skin from which the hair emerges.
Synonym(s): folliculus [TA] .

follicle

A sac-like depression or cavity, glandular or cystic in nature. Follicles may secrete new tissues as in the case of hair follicles, which synthesize and extrude hairs, and the Graafian follicles of the ovaries, which contain the eggs (ova) prior to ovulation.

follicle

  1. any small cavity or sac (see GRAAFIAN FOLLICLE, HAIR FOLLICLE, OVARIAN FOLLICLE).
  2. a dry fruit formed by the splitting of a single carpel along a line, usually ventral, to liberate its seeds.

Follicle

The small sac at the base of a hair shaft. The follicle lies below the skin surface.
Mentioned in: Boils

follicle

1. A small gland. 2. A small cavity or deep narrow depression with excretory or secretory function. 3. A small nodule of lymphocytes and other cells occurring as a result of chronic inflammation. See papilla.
conjunctival follicle Small localized aggregation of lymphocytes, plasma and other cells appearing as white or grey elevations on the palpebral conjunctiva (tarsal area) as a result of chronic irritation (allergic, viral or mechanical such as contact lenses). See adult inclusion conjunctivitis; follicular conjunctivitis.
palpebral follicle's See meibomian glands.

fol·li·cle

(fol'i-kĕl) [TA]
1. A more or less spheric mass of cells usually containing a cavity.
2. A crypt or minute cul-de-sac or lacuna, such as the depression in the skin from which the hair emerges.