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Scanning electron microscopy of the median eminence of the rat under different stress conditions


Scanning Electron Microscopy (2): 157-162
Scanning electron microscopy of the median eminence of the rat under different stress conditions
Male Sprague-Dawley rat median eminences (ME) were dissected out and studied in toto by scanning electron microscopy (SEM). Median eminences from the experimental group of animals were similarly studied. The experimental group was comprised of 3 subgroups. Each subgroup was subjected to 1 of the conditions given below. Rats (n = 14) in group 1 were water-deprived for 48-72 h. Rats in group 2 (n = 7) received an injection of 20-30% polyethylene glycol s.c. 1 day before sacrifice. Rats in group 3 (n = 4) were subjected to tail cuff pressure of approximately 250 mmHg under 37.degree. C heat. All of these conditions are known to stimulate vasopressin release. In the control group, the ventricular surface of ME was devoid of cilia except an occasional ependymal cell with tufts of cilia. Such ciliated cells only existed in the caudalmost portion of the ME. A small cluster of supraependymal cells (SEC) and supraependymal processes in the control animals were seen in the caudal part, specifically in the region of the infundibular recess. Under the experimental conditions used in this study an increase in number of supraependymal cell clusters occurred. Such clusters comprised of ovoid and pyramidal cells extended from the caudal to the rostral end of median eminence. These clusters were interconnected with each other by beaded nerve fibers containing catecholamines. The number of pyramidal-shaped supraependymal cells, as well as the ovoid SEC, increased under the experimental conditions. The morphological alterations in the surface features of the median eminence (ME) under stressful conditions studied in this report were possibly a reflection of vasopressin involvement.


Accession: 006365975



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