Journal of Applied Physiology AJP: Lung Cellular and Molecular Physiology
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J Appl Physiol 70: 1544-1549, 1991;
8750-7587/91 $5.00
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Journal of Applied Physiology, Vol 70, Issue 4 1544-1549, Copyright © 1991 by American Physiological Society

ARTICLES

Distribution of diaphragmatic lymphatic stomata

D. Negrini, S. Mukenge, M. Del Fabbro, C. Gonano and G. Miserocchi
Istituto di Fisiologia Umana, Universita degli Studi di Milano, Milan, Italy.

In seven anesthetized rabbits we measured the size, shape, and density of lymphatic stomata on the peritoneal and pleural sides of the diaphragm. The diaphragm was fixed in situ and processed for scanning electron microscopy. Results are from 2,902 peritoneal and 3,086 pleural fields (each 1,620 microns 2) randomly chosen from the various specimens. Stomata were seen in 9% of the fields examined, and in 30% of the cases they appeared grouped in clusters with 2-14 stomata/field. Stoma density was 250 +/- 242 and 72 +/- 57 (SD) stomata/mm2 on peritoneal and pleural sides, respectively, and it was similar over the muscular and tendinous portion of the two surfaces. The maximum diameter ranged from less than 1 to approximately 30 microns, with an average value of 1.2 +/- 3.1 micron. The ratio of the maximum to the minimum diameter and the surface area averaged 2 +/- 1.4 and 0.7 +/- 2.4 micron 2, respectively. The maximum and minimum diameter and surface area values followed a lognormal frequency distribution, suggesting that stomata geometry is affected by diaphragmatic tension.


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