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 ?
1,2 Follicular dendritic cell sarcoma (FDCS), first reported by Monda et al in 1986, is an uncommon intermediate grade sarcoma derived from FDC.
The C cells are often difficult to distinguish from adjacent follicular cells and histiocytes (Figure 2, A through D).
The study was conducted at Topiwala National Medical College, Mumbai on 30 normal healthy female subjects in the age group of 18-26 years in menstrual and follicular phases with 24-32 days menstrual cycle.
Immunoreactivity was considered positive if more than 10% of follicular epithelial cells stained.
Follicular lymphoma, one of the most common blood cancers among adults, is a slow-growing (indolent) form of non-Hodgkin's lymphoma, is incurable, and is characterized by cycles of remission and relapse.
KEYWORDS: Galactin-3, Follicular Adenoma, Follicular Carcinoma, Papillary Carcinoma.
Key Words: Khyber College of dentistry, Ameloblastoma, follicular, odontogenic tumour.
It was conclude that the Pb concentration was high in the follicular fluids of the cattle bred near the Elbistan coal-fired power plant (22.
Material and Methods: Total of 84 patients presenting with thyroid lesions with follicular pattern on hematoxylin and eosin (HandE) staining and having age between 18-60 years were included by non probability consecutive sampling technique.
The report provides comprehensive information on the therapeutics under development for Follicular Lymphoma, complete with analysis by stage of development, drug target, mechanism of action (MoA), route of administration (RoA) and molecule type.

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