On the ovarian bursa of the golden hamster. I. Scanning electron microscopy of the inner surface and stomatal orifices
Shinohara, H.; Nakatani, T.; Morisawa, S.; Matsuda, T.
Journal of Anatomy 147: 45-54
1986
ISSN/ISBN: 0021-8782 PMID: 3319998 Document Number: 272303
The inner surface of the ovarian bursa in the golden hamster was observed by scanning electron microscopy. There were numerous discontinuities in the bursal epithelium. Cervical-like gaps were found between irregularly spaced epithelial cells, and the subepithelial connective tissue was exposed to the bursal cavity through the gaps. Through circular defects in the epithelial lining or pores, which were less than 20 .mu.m in diameter, either the subepithelial connective tissue or stomatal orifices were visible. There were smooth surfaced areas lined with lymphatic endothelium, instead of bursal epithelium, which was continuous from the wall of the lymphatic vessel to the inner surface of the bursa. These areas were not present in all bursae, but if they were present, stomatal orifices consistently opened in them. Stomata in the ovarian bursa had two types of orifices, (1) circular orifices opening predominantly in smooth surfaced areas and measuring up to 50 .mu.m in diameter; (2) jagged orifices opening usually in pores and measuring less than 10 .mu.m in diameter. Blood cell components derived from ovulation entered lymphatics via stomata. Bursal fluid and small particles may drain into lymphatics directly via stomata and indirectly by diffusion through gaps, pores and connective tissue. Judging from the structural appearance of the stomatal orifices, the degree of opening of jagged orifices may change in response to changes in the cavity, while circular orifices may be stable openings.