Pituitary pars tuberalis

Fig. 261. Slender, twisted mitochondria with longitudinal cristae, and dense, round or oval membrane-bound secretory granules in a pituitary pars tuberalis cell (block 1029) from a rat (No.l) treated for 7 consecutive days with intraperitoneal injection of 1.5 ml Tyrode s solution per kg body weight x day. On August 4, 1976 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. Film 632-10...

Prolonged exposure to melatonin leads to time-dependent sensitization of adenylate cyclase and down-regulates melatonin receptors in pars tuberalis cells from ovine pituitary. Endocrinology 132, 285-92. 

The pituitary gland Figure 4.1) is a bilobed structure located in the sella turcica, immediately below the median eminence area of the hypothalamus. The 2 lobes are derived embryologically from different sources. The anterior lobe or adeno-hypohysis, which is differentiated into 3 distinct zones, the pars distalis, pars intermedia and the pars tuberalis, is derived from ectodermal tissue of the oral... 

---

See also in sourсe #XX -- [ ]

---