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A spherical or oval subunit of the thyroid gland, made of cuboidal epithelium, which contains colloid and the thyroglobulin and iodine from which thyroxine and triiodothyronine are synthesized.
See also: follicle
a sac or pouchlike depression or cavity.
an involuted ovarian follicle.
focal accumulations of hypertrophied lymphoid tissue in conjunctiva, indicative of an inflammatory reaction.
ovarian follicle that has not ruptured, is grossly enlarged, may be multiple and on both ovaries. Caused by insufficient luteinizing hormone. Affected cows may be nymphomaniac in behavior, but most are anestrous and anovulatory. See also cystic ovarian degeneration.
the structure within the substance of the jaws enclosing a tooth before its eruption; the dental sac and its contents.
in the ovary, hormones secreted by the largest follicle will cause others to regress.
lymphoid masses in the gastric mucosa.
a maturing ovarian follicle among whose cells fluid has begun to accumulate, leading to the formation of a single cavity and leaving the ovum located in the cumulus oophorus; called also vesicular ovarian follicle.
see hair follicle.
see corpus hemorrhagicum.
lymph follicle, lymphatic f
1. a small collection of actively proliferating lymphocytes in the cortex of a lymph node.
2. a small collection of lymphoid tissue in the mucous membrane of the gastrointestinal tract; such collections may occur singly (solitary lymphatic follicle) or closely packed together (aggregated lymphatic follicles).
the ovum and its encasing cells, at any stage of its development.
primary ovarian follicle
an immature ovarian follicle consisting of an immature ovum and the few specialized epithelial cells surrounding it.
an ovarian follicle consisting of an ovum enclosed by a single layer of cells.
a hair follicle with a relatively large sebaceous gland, producing a relatively insignificant hair.
1. areas of concentrated lymphatic tissue in the mucosa of the colon.
2. small lymph follicles scattered throughout the mucosa and submucosa of the small intestine. Called also solitary glands.
discrete cystlike units filled with a colloid substance, constituting the lobules of the thyroid gland.
vesicular ovarian follicle
site of origin of wool fiber.