Follicle

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follicle

[′fäl·ə·kəl]
(biology)
A deep, narrow sheath or a small cavity.
(botany)
A type of dehiscent fruit composed of one carpel opening along a single suture.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Follicle

 

a dry, one-celled, many-seeded, and monocarpel-lary fruit that opens along a ventral suture. The seeds are located along the suture on the edges of the carpel. Follicles are typical of the magnolias; of such members of Ranunculaceae as cowslip, garden columbine, aconite and larkspur; and of some genera of Rosaceae, such as Physocarpus.

The simplest follicles resemble a leaf folded in half lengthwise; the upper part corresponds to a stigma and the stem to a stalk. A large number of follicles may be positioned in a spiral on the axis of a blossom (as in the magnolia) to form a multiple fruit. Other types of fruits developed from follicles: nuts are follicles with a single seed, and beans are follicles with a different form of opening.


Follicle

 

a round, oval, or pear-shaped anatomical structure present in various organs in man and other vertebrates, having varied functions. In mammals egg cells develop within the ovarian follicle, which consists of a group of cells; one of these is the egg cell and the rest are epithelial cells surrounding the egg, first in one layer and then in several. As the follicle matures, spaces between the cells become filled with a clear liquid, and the single-layered primordial follicle is transformed into a mature multi-layered follicle, the Graafian follicle.

The follicle of the thyroid gland secretes thyroglobulin, a precursor of the thyroid hormones. Into the hair follicles, which enclose the hair roots and bulbs, empty excretory ducts of the sebaceous glands. Many lymphatic follicles are located in the mucous membranes of the digestive tract, the respiratory tract, and the urinary tract; for instance, follicles known as peyer’s patches are situated in the mucous membrane layer of the intestine.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The report studies the market of Follicular Unit Transplantation (FUT) and Follicular Unit Extraction (FUE) method of hair transplant market.
Follicular variants were almost entirely made up of follicles but having the characteristic nuclear features and showed invasive growth pattern (Figure 1b).
In the second form of atresia, only the oocyte is released into the ovarian lumen, leaving behind the granulosa and empty follicular envelops.
Earlier this year, Celgene submitted and had accepted a Marketing Authorization Application for R2 to the European Medicines Agency for the treatment of relapsed/refractory follicular and marginal zone lymphoma.
* Diet: Areas of the world where diets are low in iodine have more cases of follicular carcinoma than areas, like the U.S., where iodine is more likely to be a regular part of a person's diet.
(14,22) Follicular lymphomas, including PCFCL, frequently produce false-negative results.
Zymography: Gelatin-specific zymography technique was used for determination of MMPs activities in follicular fluid and seminal plasma.
Inflammatory pseudotumor-like follicular dendritic cell tumor: a distinctive low-grade malignant intra-abdominal neoplasm with consistent Epstein-Barr virus association.
Microscopic examination of the specimen showed a predominately insular and follicular growth pattern.
The patient had a history of thyroid follicular adenocarcinoma which was treated surgically with total thyroidectomy and postoperative iodine treatment 25 years prior to presentation.
CT scan of the neck confirmed a 40mm thyroid nodule, and ultrasound guided fine needle aspiration of this nodule was suggestive of a follicular neoplasm.
Follicular dendritic cell sarcoma (FDCS) is a rare intermediate grade sarcoma involving a variety of nodal and extra nodal sites.

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