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 It might be outdated or ideologically biased.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 effect of testosterone and other androgens on the primate ovaries was studied and 10 days after treatment of animals showed that testosterone resulted in 4.5-fold increase in the number of follicles; cystic follicles were also seen both micro and macroscopically along with an increase in size of the ovaries.18 In the present study, after fourteen days of administration of TP in group B the number of antral follicles increased significantly (p value = 0.001), the mean diameter of antral follicles in group B was also significantly higher when compared among various groups (p value = 0.004).
Comparative to this was group C, which was given TP and AGE concomitantly; it showed significantly increase in number of antral follicles when compared with other groups but their diameter was decreased; cystic follicles were also seen but their number and diameter was decreased as compared to the group B.
Cystic follicles, fluid filled, having a thickened theca cell layer and a thin granulose layer, were identified and their number was counted8.
There were no cystic follicles in ovary of control group (fig-2 A).
Supporting this subject, postnatal androgenization has been shown to induce accelerated aging of ovarian interstitial glands and transformation of large antral into cystic follicles as common similarities between hyperandrogenized and aging rats [45].
Expression levels of PGC1[alpha] and FNDC5: Granulosa cells were isolated from antral and pre-antral cystic follicles of DHEA-induced PCOS mice and pre-antral and antral follicles of control and vehicle mice to evaluate expression level of PGC1[alpha] and FNDC5.
In fact, the administration of the hormone combination restored the physiological serum level of estradiol and diminished the percentage of cystic follicles. However, the positive effects of the hormonal treatment were observed regardless of the SKA protocol.
Microscopy showed abundant stromal edema fluid, with occasional cystic follicles in the sections taken from the cortex of the ovary, which was compressed.

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