Pituitary pars nervosa

Fig. 251. Scantiness of neurosecretory granules in some neurones (bottom) in the pituitary pars nervosa (block 1330) of a rat (No. 11) treated for 8 consecutive days with intraperitoneal injection of 15 mg carbocromene per kg body weight x-day. On the last 5 days of experimentation the animal was exposed to an atmosphere containing only 5% oxygen for 30 min. On August 5, 1976, half an hour er the last exposure under pentobarbital anaesthesia (30 mg/kg), the animal was perfused from the abdominal aorta with 2.5 % glutaraldehyde in 0.1 M sodium cacodylate buffer (pH 7.4). Postfixation with 1 % osmium tetroxide in sodium cacodylate buffer. Embedded in Epon 812 and sectioned at 50 nm. Lead citrate and uranyl acetate. Plate 3462...

Fig. 255. Vacuoles (arrow) in the vascular endothelium in the intermittent hypoxic and reoxygenated pituitary pars nervosa (block 1451) of a rat (No. 15) treated for 8 consecutive days...

Ciliated cells are occasionally found in the junctional zone between pars intermedia and pars nervosa of the rat pituitary particularly in association with the ramifications of the pituitary cleft (Howe and Maxwell 1968). 

The pars nervosa is made of neuroglial cells and nervous fibers that are most abundant in the stalk of the pituitary. The pars nervosa contains three different types of cells that cannot be distinguished with ordinary staining techniques. The posterior lobe of... 

The pituitary body, or hypophysis, is double in origin and multiple in functions. From the stomodceal pouch of Rathke is developed the anterior lobe and the -pars intermedia from the floor of the third ventricle are formed the pars nervosa of the posterior lobe, the infundibulum and the tuber cinereum. The pituitary autacoids are of two types secretions acting directly on other tissues, and hormo-kinetic secretions acting indirectly by stimulating other endocrine glands. 

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See also in sourсe #XX -- [ , , , , , ]

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