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.

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 ?
The study raises the possibility that drugs known as JAK inhibitors could be used to restore hair growth in multiple forms of hair loss such as that induced by male pattern baldness, and additional types that occur when hair follicles are trapped in a resting state.
BOILS These can develop anywhere on your skin, but they're most likely to occur at the site of an infected hair follicle on the neck, face or thigh.
When follicles reach the mature stage, eggs will be retrieved and fertilized with a male's sperm in the laboratory to generate embryos for freezing (also known as in vitro fertilization, or IVF).
However, it was previously reported that EG is an efficient and optimal cryoprotectant for cryopreservation of mouse ovarian tissue with a little change in the structure of ovarian follicles because of low toxicity and rapid permeation from cell membrane (19, 20).
The five pigments are then injected just under the surface of the skin to create the “follicles” Replication is complete when the micro pigmentologist creates a follicle pattern that matches the pattern of the patient's natural follicles.
First, they prevent follicles from dying at an early stage.
DNA analysis confirmed that the new hair follicles were human and a genetic match to the donors.
Our method, in contrast, has the potential to actually grow new follicles using a patient's own cells.
In the report, it says that hair follicles were taken from Euzal's chest and lower abdomen on his right-hand side, which were mixed with mud and other tissues, but there is a note saying "not examined" for these hair follicles.
This first OPU was performed only to ablate the dominant follicles present at the start of the experiment and the remaining eight OPU sessions after superstimulation to detect follicular growth in each group and to evaluate the number and quality of recovered COCs.
The researchers will next seek to regenerate hair follicles using only human cells, according to the report.

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