Follicle

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Related to atretic follicle: corpus albicans, secondary follicle

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.

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.

References in periodicals archive ?
Taken together, the results suggested that the increased amount of atretic follicles and the inhibited proliferation of granular cells under arsenic-induced oxidative stress would be reversed by curcumin.
Late transitional CO and PO no longer present, however pockets of large atretic follicles are still notable.
In the animals undergoing BUAL, the cortex of ovaries was covered with small antral atretic follicles (<100-200 [micro]m).
While maintaining the balance, it has shown promising results in preserving the number of primordial, primary and secondary follicles; however, it has not been able to reduce the number of atretic follicles within CYP exposed ovaries.
One way ANOVA test showed the difference was statistically significant when mean value of diameter of atretic follicles of groups A, B, C, D and E was compared among one another, the p-value was < 0.
FSH likely stimulates the clearance of atretic follicles via production of HA, which induces macrophage activity.
Atretic follicles were detected in the 200 ng/L b- endosulfantreated group.
The atretic follicles were present throughout the year but they were abundant during autumn (spent ovaries) and winter (resting ovaries) and these atretic follicles indicated the spawned individuals.
In addition, histopathological changes in the ovary, including diabetes, polycystic ovary syndrome, ovarian enlargement [2,9] and atretic follicles have also been reported [2,21], although the exact mechanism is well known to have diabetes mellitus but construction has not increased free radical damage is the major mechanism [23] of antioxidants such as vitamins, flavonoids in the diet can have protective effects in diabetic patients [17].