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Relevant topological patterns of muscles, nerves, and blood vessels were compared across a large sample of extant archosaurs (birds and crocodylians) and outgroups (e.g., lepidosaurs and turtles) to test the utility of positional criteria, such as the relative position of the trigeminal divisions, as predictors of jaw muscle homology. Anatomical structures were visualized using dissection, sectioning, computed tomography (CT), and vascular injection. Data gathered provide a new and robust view of jaw muscle homology and introduce the first synthesized nomenclature of sauropsid musculature using multiple lines of evidence. Despite the great divergences in cephalic morphology among birds, crocodylians, and outgroups, several key sensory nerves (e.g., n. anguli oris, n. supraorbitalis, n. caudalis) and arteries proved useful for muscle identification, and vice versa. Extant crocodylians exhibit an apomorphic neuromuscular pattern counter to the trigeminal topological paradigm: the maxillary nerve runs medial, rather than lateral to M. pseudotemporalis superficialis. Alternative hypotheses of homology necessitate less parsimonious interpretations of changes in topology. Sensory branches to the rictus, external acoustic meatus, supraorbital region, and other cephalic regions suggest conservative dermatomes among reptiles. Different avian clades exhibit shifts in some muscle positions, but maintain the plesiomorphic, diapsid soft\u2010tissue topological pattern. Positional data suggest M. intramandibularis is merely the distal portion of M. pseudotemporalis separated by an intramuscular fibrocartilaginous sesamoid. These adductor chamber patterns indicate multiple topological criteria are necessary for interpretations of soft\u2010tissue homology and warrant further investigation into character congruence and developmental connectivity. J. Morphol., 2007. \u00a9 2007 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/jmor.10524","type":"journal-article","created":{"date-parts":[[2007,3,19]],"date-time":"2007-03-19T21:38:01Z","timestamp":1174340281000},"page":"457-484","source":"Crossref","is-referenced-by-count":230,"title":["Archosaur adductor chamber evolution: Integration of musculoskeletal and topological criteria in jaw muscle homology"],"prefix":"10.1002","volume":"268","author":[{"given":"Casey M.","family":"Holliday","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lawrence M.","family":"Witmer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2007,3,19]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1749-6632.1918.tb55350.x"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.1050590307"},{"key":"e_1_2_1_4_1","first-page":"217","article-title":"\u00dcber einige gesetzm\u00e4\u00dfigkeiten im Aufbau der motorichen Trigeminus\u00e4ste bei V\u00f6geln","volume":"98","author":"Barnikol HA","year":"1951","journal-title":"Anat Anz"},{"key":"e_1_2_1_5_1","first-page":"285","article-title":"Zur Morphologie de Nervus trigeminu\u015b der V\u00f6gel unter besonderer Ber\u00fccksichtigung der Accipitres, Cathartidae, Striges und Anseriformes","volume":"157","author":"Barnikol HA","year":"1954","journal-title":"Zoologie"},{"key":"e_1_2_1_6_1","first-page":"407","volume-title":"Handbook of Avian Anatomy: Nomina Anatomica Avium","author":"Baumel JJ","year":"1993"},{"key":"e_1_2_1_7_1","first-page":"45","volume-title":"Handbook of Avian Anatomy: Nomina Anatomica Avium","author":"Baumel JJ","year":"1993"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1469-7580.2001.19950503.x"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1098\/rspb.2008.0110"},{"key":"e_1_2_1_10_1","first-page":"95","article-title":"The morphology of the jaw and tongue musculature of the common pigeon. 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