Morphology and distribution of Type II supraependymal cells in the third ventricle of the guinea pig

1979 ◽  
Vol 159 (1) ◽  
pp. 67-79 ◽  
Author(s):  
Jerald A. Mitchell
Keyword(s):  
Guinea Pig ◽  
Third Ventricle ◽  
Type Ii ◽  
The Third ◽  
Supraependymal Cells

Scanning Electron Microscope of Supraependymal Neuronal Circuits in the Third Ventricle of Rhesus Monkey Brain

1990 ◽  
Vol 48 (3) ◽  
pp. 150-151
Author(s):  
A.K. Srivastava ◽  
V.K. Bajpai ◽  
D.R. Singh
Keyword(s):  
Third Ventricle ◽  
Lateral Wall ◽  
Structural Modifications ◽  
The Third ◽  
Critical Point Drying ◽  
Infundibular Recess ◽  
Supraependymal Cells ◽  
Perfusion Fixation ◽  
Ependymal Lining ◽  
Scanning Electron

The supraependymal neurons have been generally demonstrated lying over the nonciliated areas, specially CVOs, on the walls of the third cerebral ventricle of a variety of mammals. However, such neurons have till date been reported on the ciliated ependyma only inguinea pigs (Mitchell and Card, 1978). In the present study, third ventricles of nine adult monkeys of both the sexes were studied by routine scanning electron microscopy after perfusion fixation in 10 per cent neutral buffered formalin, dehydration with graded series of ethanol and amylacetate, critical-point-drying with liquid carbondioxide and sputter-coating with gold.Systematic scanning of the lateral wall of the third ventricle revealed that the ependymal surface could be divided into oligo-, and profusely ciliated zones. Pleomorphic supraependymal cells were noticed over the ciliated regions of the ventricularwall particularly between the thalamus and the mammillary region dorsal and caudal to the infundibular recess (Fig. 1). These neuron-like cells typically consisted of cell somas of variable configurations together with extensive networks of interconnected neuritic processes. At higher magnifications, the neuronal bodies depicted diverse structural modifications(Fig.2). Processes of variable diameters coursed over the ciliary carpet of the lateral wall of the third ventricle(Fig.3). At times, the processes exhibiting varicosities over the supramammillaryzone(Fig.4)coursed for variabledistances over the ependymal lining. The majority of such neuritic processes appeared to penetrate the underlying ventricular wall.

Central control of renal sodium-phosphate (NaPi-2) transporters

2004 ◽  
Vol 286 (4) ◽  
pp. F647-F652 ◽  
Author(s):  
Susan E. Mulroney ◽  
Craig B. Woda ◽  
Nabil Halaihel ◽  
Brandon Louie ◽  
Kevin McDonnell ◽  
...  
Keyword(s):  
Sodium Phosphate ◽  
Wistar Rats ◽  
Filtration Rate ◽  
Third Ventricle ◽  
Proximal Tubules ◽  
Whole Body ◽  
Central Control ◽  
Type Ii ◽  
The Third ◽  
The Brain

Regulation of phosphate (Pi) reabsorption occurs through the up- and downregulation of the renal type-II sodium Pi cotransporters (NaPi-2). Recently, renal NaPi2-type expression has been identified in areas of the brain. The present study determined whether brain NaPi-2 is regulated by dietary Pi and whether the behavioral and renal adaptations to low-dietary Pi are controlled centrally. NaPi-2-like expression in the third ventricle (3V) and amygdala of juvenile Wistar rats was regulated by dietary Pi, as in the kidneys. When cerebrospinal fluid (CSF) Pi concentration was elevated by 3V injections of Pi in rats fed low-Pi diet (LPD), the behavioral and renal adaptations to LPD were abolished. Most importantly, NaPi-2 expression was markedly reduced not only in the brain, but also renal proximal tubules, despite the low plasma Pi milieu. This was confirmed by the significant reduction in the transport maximum for Pi (from 8.1 ± 0.2 in LPD + veh 3V to 1.7 ± 0.1 μmol Pi/ml glomerular filtration rate in LPD + 3V Pi, P < 0.001). These findings indicate that NaPi-2-like transporters in the brain are regulated by both dietary Pi and CSF Pi concentrations, and most significantly, that the central Pi milieu can regulate renal NaPi-2 expression. We hypothesize that central 3V NaPi-2 transporters may act as Pi sensors and help regulate both brain and whole body Pi homeostasis.

Supraependymal cells in the third ventricle of the neonatal rat

1978 ◽  
Vol 190 (2) ◽  
pp. 257-269 ◽  
Author(s):  
Raymond J. Walsh ◽  
James R. Brawer ◽  
Peck Sun Lin
Keyword(s):  
Third Ventricle ◽  
Neonatal Rat ◽  
The Third ◽  
Supraependymal Cells

Endoscopic Surgery for Tumors in and around the Third Ventricle

2020 ◽  
Author(s):  
Kenichi Oyama ◽  
Toshio Hirohata ◽  
Keisuke Onoda ◽  
Shigeyuki Tahara ◽  
Akira Teramoto ◽  
...  
Keyword(s):  
Endoscopic Surgery ◽  
Third Ventricle ◽  
The Third
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