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 It might be outdated or ideologically biased.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 ?
In human assisted reproduction, there is a variable response to the gonadotropin stimulation by the ovaries therefore it is difficult to predict.9 The results of current study demonstrate that AMH has a positive association with the number of follicles restored as well as number of oocytes retrieved.
HFG is composed of hair follicle stem cells derived from both epithelial (outer layer of the skin) and mesenchymal tissue (connective tissue derived from the mesoderm).
This means the fewer "immature" ones you have, the fewer "mature" follicles later in life that can release an egg cell for fertilisation.
Interestingly, there are sympathetic nerves that nestle close to hair follicle stem cells.
The mean number of follicles, as affected by diet and age (as well as mean length and area of the proximal follicle in each ovariole), was subjected to a 2-way ANOVA and differences determined by Tukey's test (P < 0.05).
Recently, anethole has been shown to improve the number of meiotically competent oocytes when added during in vitro culture of isolated caprine secondary follicles (10).
Low levels of ewe body condition are known to result in the development of a low number of large follicles compared with ewes in high levels of body condition, and these differences are then reflected in the ovulation rates and the reproductive performances of the animals (Rhind and McNeilly, 1998).
Obtaining viable follicles would accomplish 2 objectives: first, to obtain mature follicles suitable for IVF, and second, to obtain immature follicles that may be matured in vitro, similar to techniques used with mammalian follicles, for future IVF.
Detection of the expression of FoxN1 and FoxE1 proteins in the skin hair follicles: The genetic information in the DNA sequence of an organism is transcribed and translated, and it is ultimately realized in the form of synthesized biologically active protein molecules.
In this study, we investigated the differential expression of lncRNAs and mRNAs in different development periods of follicles using RNA-seq technology.

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