Diseases of the adrenal gland diseases adrenal cortex
Endocrinology / / May 13, 2016
Additional adrenal glands should be considered, as the remnants of fetal tissue.Most often they consist only of the cortical or chromaffin tissue and much less of the compound both tissues, presenting the same manner as in the adrenal gland to miniature.Additional human adrenal occur approximately 16-20%, as some species of animals (mice, rats, rabbits) they are observed frequently.In most cases this extra cortical tissue (interrenal cells), consisting mainly of the zona fasciculata (Ulrich, 1895) and situated in different parts of the abdominal cavity, sometimes enclosed in various organs of her ovaries (Ulrich, 1895), a broad ligamentthe uterus or in the epididymis (Meyer, 1898, 1903; Wiesel, 1898, 1899), at v.cava (Stilling, 1889), in the kidney, liver, along the ureters (Poll, 1904; MN Cheboksary, 1910).
extremely rare to see extra adrenal glands, consisting of bark containing lipids, and medulla (Mulon, Porak, 1913) - "true" extra adrenal glands, as they are called Bachmann (1954), and Soffer (1
remains an open question whether these extra calf to function fully.Most expressed positive (Pick, 1901; Dietrich, Siegmund, 1926; Friedman, 1948).However, some deny the possibility of compensation for the reduced function of the adrenal cortex of the extra cortical tissue (N. Pende, 1937).
Extra chromaffin tissue distributed widely in humans, and it can be found almost everywhere in the form paraganglia.
The adrenal glands are two separate endocrine glands - the cortex and medulla, which in lower vertebrates exist as separate two bodies (interrenal and suprarenalovy).In humans, these two are connected to one gland.
cortical substance is derived from mesoderm.The medulla is derived from ectoderm - from sympathetic ganglia.
the embryo cortex begins to function the third lunar month.
- Physiology of the adrenal cortex
- chromophobe pituitary adenoma
- blood supply and innervation of the adrenal
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- physiology of the pineal gland and its relationship with the endocrine glands
- MACROGENITOSOMIA PRAECOX.Etiology and pathogenesis
- Morforfologiya adrenal
- biosynthesis and metabolism of hormones of the adrenal cortex
- MACROGENITOSOMIA PRAECOX.Diagnoz and differential diagnosis
true functioning adrenal medulla develops only after the birth, and its growth is at the same timedegeneration ekstraadrenalovoy chromaffin tissue.
thickness and adrenal cortex structure changes with age.During fetal development the adrenal glands become very large - in 10-20 times more than the adult adrenal, and consist almost entirely of cortical cells.At birth, the adrenal cortex is composed of two parts: the general fetal cortex or X-band, which is 80% of the entire adrenal and significantly thinner outer layer (true cortex), wherein identical cells cortical cortex ordinary cells.After birth, the adrenal glands decrease in volume due to the rapid degeneration of the X-band, which disappears almost completely during the first months of life.Adrenal zona reticularis adults location corresponds to X zone.Apparently, there is a zone postnatal mesh cells of the mesh fetal zone m. E. Area, which subsequently undergoes an involution.The subsequent growth of the cortex is considerably accelerated before and during puberty, after which it slowed down to middle years of life, when they begin to manifest itself atrophic processes.With age, the interior of the beam zone becomes narrower, and its external divisions and expand net area that corresponds to rise of signs of atrophy.
05 May, 2016
05 May, 2016