Distribution of diaphragmatic lymphatic stomata

D. Negrini, S. Mukenge, M. Del Fabbro, C. Gonano, G. Miserocchi

Research output: Contribution to journalArticlepeer-review


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 μm2) 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 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.

Original languageEnglish
Pages (from-to)1544-1549
Number of pages6
JournalJournal of Applied Physiology
Issue number4
Publication statusPublished - 1991


  • peritoneal liquid pressure
  • pleural liquid pressure

ASJC Scopus subject areas

  • Physiology
  • Endocrinology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation


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