Follicle

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Related to lymphoid follicle: lymphoid tissue, Lymph system

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 It might be outdated or ideologically biased.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 ?
However, real GC-like structures with [T.sub.FH] cells were merely found in those lymphoid follicles that belong to pSS group with FS = 3 and showed more severe inflammatory lesions.
Among pathologic specimens, 231 cases (46.11%) of lymphoid follicles were observed.
COPD has been regarded as an autoimmune disease, on the basis of the presence of B-cell lymphoid follicles in advanced COPD and the detection of several autoantibodies in the serum of patients with COPD [13, 91, 92].
Lymphoid follicles are sometimes seen, but differentiation from diffuse lymphoid hyperplasia is necessary.
MALT lymphomas start as expansion of the marginal zone around secondary lymphoid follicles, typically expanding the interfollicular area and replacing normal glandular tissue (Figure 1, A).
Stage 3: Even more prominent lymphocytic infiltration, with lymphoid follicle formation, parenchymal atrophy, peri-ductal hyalinization, and sclerosis.
Nine of 13 cases demonstrated lymphoid follicle formation.
vermicularis infection were re-examined for the presence of acute inflammation, congestion, hemorrhage, perforation, lymphoid hyperplasia (LH; lymphoid follicles forming germinal centers), necrosis, granuloma, obliteration, hyalinization, tip involution/obliteration and mucosal architectural distortion.
Microscopy revealed a lymph node with a relatively preserved general structure, distorted by multiple lymphoid follicles placed in cortical and medullar regions.
Lymphoid tissue found throughout the submucosa of the small intestine commonly present as aggregate of lymphoid follicles known as Peyer's patches.
Though many advanced investigations performed, this disease may not be diagnosed and the most important point for the diagnosis is the histopathological evaluation of tissue samples characterized by infiltration of lymphoid follicles by dense eosinophilic-lymphocytic inflammation, fibrosis and vascular proliferation (4).