{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T23:09:03Z","timestamp":1765667343398,"version":"build-2065373602"},"reference-count":53,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2021,6,14]],"date-time":"2021-06-14T00:00:00Z","timestamp":1623628800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["anatomypubs.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["The Anatomical Record"],"published-print":{"date-parts":[[2022,10]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The American alligator (<jats:italic>Alligator mississippiensis<\/jats:italic>) has a postpulmonary septum (PPS) that partitions the intracoelomic cavity. The PPS adheres to the capsule of the liver caudally and to the visceral pleura of the lung cranially; the ventrolateral portions of the PPS are invested with smooth muscle, the remainder is tendinous. Differential pressure transducers were used to record the intrathoracic (ITP) and intraperitoneal (IPP) pressures, and determine the transdiaphragmatic pressure (TDP). Each ventilatory pulse resulted in a pulse in ITP and a significantly lower pulse in IPP; meaning that a TDP was established, and that the pleural and peritoneal cavities were functionally isolated. The anesthetized alligators were tilted 30\u00b0 head\u2010up or head\u2010down in order to displace the liver. Head\u2010up rotations caused a significant increase in IPP, and a significant decrease in ITP (which became negative); head\u2010down rotations produced the opposite effect. During these rotations, the PPS maintained opposite pressures (positive or negative) in the pleural and peritoneal cavities, and established TDPs greater than have been reported for some mammals. Two types of \u201cbreaths\u201d were recorded during these experiments. The first was interpreted as a contraction of the diaphragmaticus muscle, which displaces the liver caudally; these breaths had the same effect as the head\u2010up rotations. The second type of breath was interpreted as constriction of the thoracic and abdominal body walls; this type of breath produced pronounced, long\u2010duration, roughly parallel, increases in ITP and IPP. The smooth muscle within the PPS is suggestive of higher\u2010order adjustment or tuning of the PPS's tensile state.<\/jats:p>","DOI":"10.1002\/ar.24692","type":"journal-article","created":{"date-parts":[[2021,6,15]],"date-time":"2021-06-15T00:12:30Z","timestamp":1623715950000},"page":"3055-3074","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["The functional morphology of the <scp>postpulmonary<\/scp> septum of the American alligator (<scp><i>Alligator mississippiensis<\/i><\/scp>)"],"prefix":"10.1002","volume":"305","author":[{"given":"Michael","family":"Cramberg","sequence":"first","affiliation":[{"name":"Department of Anatomy Kirksville College of Osteopathic Medicine, AT Still University  Kirksville Missouri"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Skye","family":"Greer","sequence":"additional","affiliation":[{"name":"Department of Anatomy Kirksville College of Osteopathic Medicine, AT Still University  Kirksville Missouri"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0988-7731","authenticated-orcid":false,"given":"Bruce A.","family":"Young","sequence":"additional","affiliation":[{"name":"Department of Anatomy Kirksville College of Osteopathic Medicine, AT Still University  Kirksville 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