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This study aimed to characterize the ultrastructure of the posterior stroma and interfacial zone of Descemet\u2019s membrane (DM) in canine eyes. Eighteen canine corneo-scleral discs were included. Intrastromal air injection resulted in the formation of type 1 big bubble (BB) in 73% (n\u2009=\u200911\/15) of corneas, with a mean diameter of 11.0\u2009\u00b1\u20091.3\u00a0mm. No type 2 BB was created. Anterior segment optical coherence tomography, histology and transmission electron microscopy confirmed that the wall of BB was composed of DM, in contact with remaining stroma (canine PDL; cPDL). The cPDL was populated with keratocytes, of varying thickness of 16.2\u2009\u00b1\u20094.2\u00a0\u00b5m in close apposition to the DM, and composed of collagen bundles arranged in transverse, longitudinal and oblique directions. The interfacial zone, between DM and cPDL, showed fibril extension in all three directions, predominantly longitudinal. Irregular extensions of DM material into cPDL stroma were observed. No long-spaced collagen was detected. In conclusion, there exists a well-defined cleavage plane between the posterior stroma and cPDL, with similar but not identical characteristics as in humans, that is revealed by pneumodissection. This adds to our understanding of the anatomy of the posterior most canine cornea, which will have significant clinical impact on posterior corneal surgery and understanding of corneal pathology in dogs.<\/jats:p>","DOI":"10.1038\/s41598-022-24438-5","type":"journal-article","created":{"date-parts":[[2023,4,11]],"date-time":"2023-04-11T18:02:44Z","timestamp":1681236164000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Ex vivo demonstration of canine corneal pre-Descemet\u2019s anatomy using pneumodissection as for the big bubble technique for deep anterior lamellar keratoplasty"],"prefix":"10.1038","volume":"13","author":[{"given":"Christiane","family":"Kafarnik","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lana A.","family":"Faraj","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Darren S. 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