Pituitary gland ..
Is a small gland size, the size of a pea, with a diameter of one centimeter, and weighs half a gram, and there in a hole, especially in the bottom of the base of the brain, called the Turkish saddle Sella Turcica because the shape resembles the Turkish saddle horse
It consists of two lobes differ from each other in terms of structure and function, and communicate with the hypothalamus Hypothalamus by together Pituitary Pituitary Stalk, and the associated lobes with each other by the middle lobe, known as the isthmus Isthmus, which is a stretch tight like a frontal lobe origin and structure and function.
And divided by the pituitary gland to:
1 - the frontal lobe Anterior Pituitary adenoma
2 - posterior lobe nerve Posterior Pituitary
3 - Isthmus
Microscopic structure of the parts of the pituitary gland
1 - posterior lobe, the nervous
It is a store for some hormone hormones secreted by the hypothalamus, it does not produce a self-hormones, but stores hormones secreted by the hypothalamus and then when needed.
And composed mainly of nerve fibers is located Nkhaaanah their bodies in the nucleus of the hypothalamus, and the spread between these nerve fibers pituitary cells do not know the exact function
Is secreted lobe hormones are:
A * - antidiuretic hormone to urinate ADH and also called vasopressin Vasopressine: increases of this hormone the permeability of renal tubules of the water, Verechh from inside the pipe to the interstitial fluid of high tension, which works on the high concentration of the urine in pipes and low quantity, and therefore less diuresis
B * - Tosin Oxyacetylene hormone Oxytocin has Tathren are:
A B - secretion of milk from the breast to the outside, but has no impact on the composition
B-2 - Alert smooth muscle, especially the uterus raises Tqlsatha, benefiting in the process of birth Alasirag
2 - the frontal lobe, glandular
Consists mainly of cells, a few fibers, and cells of three types:
- Loathe to color cells Chromophobes, with a pale cytoplasmic unfavorable
- Love the color cells of acidic Chromphils Eosinophils
- Cells of the love for the color base Chromphils Basophils
Cells for the color of love are two types, namely:
- Alpha, alpha cells secrete the hormones are:
Growth hormone GH, and Prolactin milk hormone
- Beta, beta cells secrete a group of hormones which are:
Hormone to follicle Exhorter F.S.H
Thyroid hormone Exhorter T.S.H
Hormone Almhloten L.H
Hormone prompter of melanin, the skin color of the MSH
Hormone Exhorter adrenal cortex to ACTH
3 - East lobe (Isthmus)
Containing colloidal vesicles resemble those found in the thyroid gland, do not know his job thoroughly
Anatomical location and relations:
Pituitary gland is located in the Turkish saddle hole at the base of the skull, and to determine its place is a forum horizontal line from front to back starting from the base of the nose and walking towards the back, and the vertical line downward from the middle vertex
Separates the cavernous sinus from the pituitary of all aspects of dura mater membrane Duramatter and the bottom of the saddle are bone Turkish Corynebacterium Spheniod which include air pocket. In theory, the pituitary gland is surrounded by arachnoid membrane, but in practice this membrane is integrated with the pia mater membrane Pia Matter on the surface of the pituitary and Soiktha about the status of the mother's interview without epidural unite with them.
The top point of no visual decussation Optic Chiasma, and this in the case of swelling of the pituitary occur pressure on the nerves Alabesria leads to blindness by the demise of the tumor removed
Demtem fine
