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D.v. Ivanoff - One of the best experts on this subject based on the ideXlab platform.
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Unlocking the ring: Occurrence and development of the uninterrupted intrabullar Septum in Canidae
Mammalian Biology, 2007Co-Authors: D.v. IvanoffAbstract:Der Mähnenwolf, Chrysocyon brachyurus , und einige der frühen Caniden sind bekannt für ihr eigenartiges, ringförmiges intrabulläres Septum (eine unvollständige knöcherne Scheidewand innerhalb der auditorischen Bulla). Um den Ursprung dieses Merkmalszustandes zu verstehen, wurden die Bullae an 28 mazerierten adulten und juvenilen Schädeln rezenter Caninae untersucht, mit speziellem Augenmerk auf das Auftreten eines ringförmigen (nicht unterbrochenen) Septums. AuXer bei C. brachyurus , wurde diese Morphologie auch ausnahmslos bei Speothos venaticus festgestellt, was das Vorkommen eines nicht unterbrochenen Septums als erste osteologische Synapomorphie ausweist, die jene vor kurzem entdeckte molekulare Systematik des Chrysocyon-Speothos -Kladus unterstützt. Die Morphologie juveniler Caninae zeigt, daß das intrabulläre Septum seit den frühesten Entwicklungsstadien ringförmig ist. Mit fortschreitender Entwicklung wird das Septum unterschie-dlich resorbiert, abhängig vomTaxon, wird es hufeisen- oder halbmondförmig. Durch die Umwandlung des anfänglich ringförmigen Septums scheinen Caninae einen ontogenetisch parallelen Trend zu haben, wie er auch in der Phylogenie bei Hesperocyoninae, einer ausgestorbenen Caniden-Gruppe gefunden wird. Aber die umgekehrte Rekapitulation erscheint in der Evolution der Caninae selbst, wobei ihre am höchsten abgeleiteten Mitglieder ein am wenigsten resorbiertes Septum haben. Dies impliziert, daß das ontogenetische Kriterium nicht für die Feststellung der Polarität der Zustände der septalen Merkmale innerhalb der Caninae zu verwenden ist. Die Evolution des intrabullären Septums der Caninae könnte eine Serie von Heterochronien aufnehmen, in Richtung der immer stärker pädomorphen Zustände in einigen Zweigen des Tribus Canini. Es wurden auch neue Daten über die Knochenzusammensetzung des intrabullären Septums bei Caniden erhalten. Während das dorsale Septum bei adulten Caninae entotympanisch ist, ist das ventrale tatsächlich ectotympanisch. Diese zusammengesetzte Struktur resultiert aus dem Eindringen des ventralen entotympanischen Sinus in das Ectotympanicum. The maned wolf, Chrysocyon brachyurus , and some of the earliest canids are known for the peculiar ring-like shape of their intrabullar Septum (an incomplete bony partition in the auditory bulla). In attempt to understand the origin of this character state, the auditory bullae in adult and juvenile dried skulls of 28 species of living Caninae were examined with a special emphasis on the occurrence of a ring-like (uninterrupted) Septum. In addition to C. brachyurus , this morphology was invariably found in the bush dog, Speothos venaticus , what makes the presence of the uninterrupted Septum the first osteological synapomorphy supporting the Chrysocyon-Speothos clade recently revealed by molecular systematics. The canine juvenile morphologies indicate that the intrabullar Septum is ring-like at its early developmental stage. As ontogeny progresses, the Septum resorbs differentially, depending on taxon, to become horseshoe- or crescent-like. By this transformation of the initially ring-like Septum, Caninae seem to ontogenetically parallel a trend found in the phylogeny of Hesperocyoninae, an extinct canid group. The reverse recapitulation occurs, however, in the evolution of Caninae themselves, with their most-derived members having a least-resorbed Septum. This implies that the ontogenetic criterion cannot be used for inference of the polarity of septal character states within the Caninae. The evolution of the canine intrabullar Septum could have involved a series of heterochronies towards increasingly paedomorphic states in several lineages of the tribe Canini. New data were also obtained on the bone composition of the canid intrabullar Septum. While the dorsal Septum is entotympanic, the ventral one is in fact ectotympanic in adult Caninae. This compound structure results from penetration of the ventral entotympanic sinus into the ectotympanic.
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Unlocking the ring: Occurrence and development of the uninterrupted intrabullar Septum in Canidae
Mammalian Biology, 2007Co-Authors: D.v. IvanoffAbstract:Abstract The maned wolf, Chrysocyon brachyurus, and some of the earliest canids are known for the peculiar ring-like shape of their intrabullar Septum (an incomplete bony partition in the auditory bulla). In attempt to understand the origin of this character state, the auditory bullae in adult and juvenile dried skulls of 28 species of living Caninae were examined with a special emphasis on the occurrence of a ring-like (uninterrupted) Septum. In addition to C. brachyurus, this morphology was invariably found in the bush dog, Speothos venaticus, what makes the presence of the uninterrupted Septum the first osteological synapomorphy supporting the Chrysocyon–Speothos clade recently revealed by molecular systematics. The canine juvenile morphologies indicate that the intrabullar Septum is ring-like at its early developmental stage. As ontogeny progresses, the Septum resorbs differentially, depending on taxon, to become horseshoe- or crescent-like. By this transformation of the initially ring-like Septum, Caninae seem to ontogenetically parallel a trend found in the phylogeny of Hesperocyoninae, an extinct canid group. The reverse recapitulation occurs, however, in the evolution of Caninae themselves, with their most-derived members having a least-resorbed Septum. This implies that the ontogenetic criterion cannot be used for inference of the polarity of septal character states within the Caninae. The evolution of the canine intrabullar Septum could have involved a series of heterochronies towards increasingly paedomorphic states in several lineages of the tribe Canini. New data were also obtained on the bone composition of the canid intrabullar Septum. While the dorsal Septum is entotympanic, the ventral one is in fact ectotympanic in adult Caninae. This compound structure results from penetration of the ventral entotympanic sinus into the ectotympanic.
Arash Rafii - One of the best experts on this subject based on the ideXlab platform.
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Recto-vaginal Septum cystadenocarcinoma: a case report and review of the literature
BMC Women's Health, 2016Co-Authors: Sophie Warembourg, Mélanie Cayrac, Gauthier Rathat, Arash RafiiAbstract:BACKGROUND: Carcinoma of the recto-vaginal Septum is a quite rare location and related to peritoneal and primary ovarian carcinomas. There are only few reports in the literature with a very poor prognosis. CASE PRESENTATION: Here we report the case of a 63 years old woman with past medical history of left oophorectomy presenting with a pelvic pain. The magnetic resonance imaging (MRI) demonstrated a 10 cm mass located in the recto-vaginal Septum. A block resection was performed allowing the retrieval of a 10 cm solid tumor of the recto-vaginal Septum. Peritoneal biopsies and the right ovary were normal the final diagnosis was cystadenocarcinoma of the recto-vaginal Septum. The patient received adjuvant chemotherapy and displays no sign of recurrence 36 months after diagnosis. CONCLUSION: The management of recto-vaginal Septum carcinoma with en bloc resection should be performed to avoid peritoneal spread and improve prognosis.
Sandra Webb - One of the best experts on this subject based on the ideXlab platform.
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Development and structure of the atrial Septum
Heart, 2002Co-Authors: Robert H Anderson, Nigel A. Brown, Sandra WebbAbstract:Most cardiologists would probably consider that, during their training, they had received appropriate instruction concerning the mode of development and structure of the atrial Septum. This is likely to be founded on the diagrams that exist in most standard textbooks of cardiac embryology. These illustrate the formation of primary and secondary atrial Septums as overlapping muscular sheets that grow into the common atrium. This type of illustration implies that similar morphological mechanisms of development lead to the formation of these two “Septums”. This is not so. To the best of our knowledge, there is no evidence existing which supports this concept of growth of a second muscular shelf into the developing atriums so as to overlap the primary atrial Septum, and to provide the rims of the definitive oval fossa. On the contrary, it has long been established1,2 that the superior border of the “Septum secundum”, in other words the superior rim of the oval fossa, is an infolding of the atrial roof. In this respect, case reports are to be found that describe the formation of lipomas within the supposed “Septum secundum”.3 Careful study of such lipomas,4 along with scrutiny of the published images,3 reveals that the fat accumulates within the deeply infolded superior interatrial groove. All the “classical” accounts of atrial septal development have also ignored totally the contribution to atrial septation made by the “spina vestibuli”, a structure first described by His in the 19th century.5 Similarly, they take no account of the contributions made by the mesenchymal cap which clothes the leading edge of the muscular primary atrial Septum.6 In reality, therefore, more structures contribute to division of the atriums than the so-called primary and secondary Septums.7 It is appreciation of the roles of all these various components …
Sophie Warembourg - One of the best experts on this subject based on the ideXlab platform.
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Recto-vaginal Septum cystadenocarcinoma: a case report and review of the literature
BMC Women's Health, 2016Co-Authors: Sophie Warembourg, Mélanie Cayrac, Gauthier Rathat, Arash RafiiAbstract:BACKGROUND: Carcinoma of the recto-vaginal Septum is a quite rare location and related to peritoneal and primary ovarian carcinomas. There are only few reports in the literature with a very poor prognosis. CASE PRESENTATION: Here we report the case of a 63 years old woman with past medical history of left oophorectomy presenting with a pelvic pain. The magnetic resonance imaging (MRI) demonstrated a 10 cm mass located in the recto-vaginal Septum. A block resection was performed allowing the retrieval of a 10 cm solid tumor of the recto-vaginal Septum. Peritoneal biopsies and the right ovary were normal the final diagnosis was cystadenocarcinoma of the recto-vaginal Septum. The patient received adjuvant chemotherapy and displays no sign of recurrence 36 months after diagnosis. CONCLUSION: The management of recto-vaginal Septum carcinoma with en bloc resection should be performed to avoid peritoneal spread and improve prognosis.
Bengt Anderberg - One of the best experts on this subject based on the ideXlab platform.
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The new Septum magnets
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2005Co-Authors: Lars-johan Lindgren, Bengt AnderbergAbstract:In an earlier paper we reported on a new Septum magnet design with a magnetic flux filter [1]. Now the first Septum magnet is in operation as an injection Septum magnet for the MAX I storage ring. We describe the actual mechanical construction and the field measurements of the new magnets. The fine structure of the Septum nose needed several trials in the construction until we found the final solution. The measured residual stray fields in the ring tube are even smaller than was expected from the model calculations.
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The new Septum magnets
Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, 2005Co-Authors: Lars-johan Lindgren, Bengt AnderbergAbstract:In an earlier paper we reported on a new Septum magnet design with a magnetic flux filter [1]. Now the first Septum magnet is in operation as in injection Septum magnet for the MAX I storage ring. We dcscribe the actual mechanical construction and the field measurements of the new magnets. The fine Structure of the Septum nose needed several trials in the construction until we found the final solution. The measured residual stray fields in the ring tube are even smaller than was expected from the model calculations
