Anatomy of PITUITARY GLAND by ZORO .pptx

1. 1 2 3 4 PITUTARY GLAND ----------------------------EMCH------------------------------

2. PITUTARY GLAND - □ It is referred to as the master of endocrine gland. □ It is a small oval structure of 1 cm in diameter. □ It doubles its size during pregnancy.

3. PITUITARY GLAND (POSITION) Optic chiasma Mammillary body Body of sphenoid □ It lies in the hypophyseal fossa of the body of sphenoid bone, between optic chlasma (anteriorly) & mamillary bodies (posteriorly).

4. PITUITARY GLAND - X-RAY SKULL : LATERAL VIEW SAGITTAL SECTION OF HEAD & NECK Hypophyseal fossa Sphenoidal air sinus

5. IMPORTANT RELATIONS ;._ꜝ.'.⁻.,, $ ✓S UPERIOR: Diaphragma sellae ✓I NFERIOR: Sphenoidal air sinuses ✓ L ATERAL: Cavernous sinuses

6. SUBDIVISIONS OF PITUITARY GLAND - Pars Anterior Pars posterior ... The gland is subdivided into: Pars Anterior (adenohypophysis): true gland, secretes hormones Pars Posterior (neurohypophysis): connected to hypothalamus through hypothalamo--hypophyseal tract, stores hormones secreted by hypothalamic nuclei Pars intermediate

7. BLOOD SUPPLY OF PITUITARY GLAND &; -C - ARTERIES: Superior & inferior hypophyseal arteries (branches of internal carotid artery) The inferior hypophyseal: supplies posterior lobe of pituitary gland. •The superior hypophyseal: supplies infundibulum & forms a capillary network VEINS: hypophyseal veins drain into cavernous sinuses.

8. - ✓ Thick irregular cords of cells *Chromophils(50%) *Chromophobes(50%) ✓Chromophils are divided into :- -Acidophils(75%) . -Basophils(25%) -....Y"°"I' OINv"-OftC _r,-.•ye•lil•l;­ -- Hypophyseal portal system

9. Posterior Lobe - - Axons of supraoptlc & paraventrlcular cells of hypothalamus send their secretion (neurosacretion) to posterior lobe of pituitary gland through hypothalamo­ hypophyseal tract --­ .,.,...OIL: Olly •••cow ·---