Structure of the posthepatic septum and its influence on visceral topology in the tegu lizard, Tupinambis merianae (Teiidae: Reptilia)

@article{Klein2003StructureOT,
  title={Structure of the posthepatic septum and its influence on visceral topology in the tegu lizard, Tupinambis merianae (Teiidae: Reptilia)},
  author={Wilfried Klein and Augusto Shinya Abe and Denis V. Andrade and Steve F. Perry},
  journal={Journal of Morphology},
  year={2003},
  volume={258}
}
The posthepatic septum (PHS) divides the body cavity of Tupinambis merianae into two parts: the cranial one containing the lungs and liver and the caudal one containing the remaining viscera. The PHS is composed of layers of collagenous fibers and bundles of smooth muscle, neither of which show systematic orientation, as well as isolated blood vessels, lymphatic vessels, and nerves. Striated muscle of the abdominal wall does not invade the PHS. The contractions of the smooth muscles may… 
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15 Citations

Evolution and Functional Differentiation of the Diaphragm Muscle of Mammals.
TLDR
The DIAm pump evolved from the advantage afforded by more effective generation of both a negative Pth for ventilation of the lungs and a positive Pab for venous return of blood to the heart and expulsive behaviors such as airway clearance, defecation, micturition, and child birth.
Static lung compliance and body pressures in Tupinambis merianae with and without post-hepatic septum
Role of the post-hepatic septum on breathing during locomotion in Tupinambis merianae (Reptilia: Teiidae)
TLDR
Tupinambis merianae increased minute ventilation by increasing both tidal volume and breathing frequency during sustained locomotion at 0.17 m s-1.5 m, suggesting that the PHS facilitates ventilation by acting as a mechanical barrier, preventing the viscera from moving cranially during physical exertion.
A gastrointestinal role for the amphibian ‘diaphragm’ of Xenopus laevis
TLDR
The amphibian ‘diaphragm’ seems to be functionally similar to the mammalian crural diaphragms, and it is suggested that the original role of the diphragm was not respiratory but gastrointestinal.
The evolutionary origin of the mammalian diaphragm
A caseian point for the evolution of a diaphragm homologue among the earliest synapsids
TLDR
The paleobiology and the respiratory apparatus of one of the oldest lineages of mammal‐like reptiles: the Caseidae is analyzed and it is deduced that a homologue of the mammalian diaphragm had already evolved about 50 Ma earlier than previously assumed.
Herniation of Duodenum into the Right Ventral Hepatic Peritoneal Cavity with Groove Formation at the Ventral Hepatic Surface in a 2-Week-Old Chicken
TLDR
This is the first report of duodenum herniation into the right ventral hepatic peritoneal cavity resulting in groove formation on the ventral hepatatic surface in a 2-week-old chicken.
A new scenario of the evolutionary derivation of the mammalian diaphragm from shoulder muscles
TLDR
It is hypothesized that the diaphragm was acquired in two steps: first, forelimb muscle cells were incorporated into tissues to form a primitive diaphagm in the stem synapsid grade, and second, the diphragm in cynodonts became entrapped in the region controlled by pulmonary development.
Trade-offs in the Evolution of the Respiratory Apparatus of Chordates
TLDR
Compared with the kinetic bronchoalveolar mammalian lung, the avian system combines a large surface area and thin air–blood barrier of the constant volume lung with ease of inflation of the air sacs, resulting in energy-efficient gas exchange.
Comparative Evaluation of the Cadaveric and Computed Tomographic Features of the Coelomic Cavity in the Green Iguana (Iguana iguana), Black and White Tegu (Tupinambis merianae) and Bearded Dragon (Pogona vitticeps)
TLDR
The results provide an atlas of the normal cross‐sectional and computed tomographic anatomy of the coelomic cavity in the green iguana, the black and white tegu and the bearded dragon, which is useful in the interpretation of any imaging modality.
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