Meeting Abstract S2-2.1  Thursday, Jan. 3  Is the amphibian skull segmented? Novel insights from neural crest labeling and functional studies HANKEN, J.; Harvard University hanken@oeb.harvard.edu Many fundamental aspects of cranial anatomy in vertebrates were resolved initially well before the delineation and broad acceptance of Darwinian evolution, let alone recent technical and conceptual advances such as molecular genetics, […]

Meeting Abstract S2-2.2  Thursday, Jan. 3  Is Segmental Organization Presaged In or Imposed Upon Craniofacial Mesenchymal Populations? NODEN, Drew M.; Cornell University dmn2@cornell.edu Many of the debates concerning segmental organization of the vertebrate head have centered upon issues of if, how, and when craniofacial mesenchymal populations such as cephalic paraxial mesoderm and the neural crest exhibit metameric […]

Meeting Abstract S2-2.4  Thursday, Jan. 3  Head segments in developmental and evolutionary contexts KURATANI, Shigeru; CDB, RIKEN, Kobe, Japan saizo@cdb.riken.jp The theory of head segmentation has been one of the central topics in vertebrate comparative morphology, which can now be treated in modern evolutionary developmental contexts. This theory first arose as a transcendental idea of morphology, more […]

Meeting Abstract S2-1.3  Thursday, Jan. 3  Segmenting the Mosaic Head KIMMEL, C. B.*; EBERHART, J. K.; MOENS, C. B.; University of Oregon, Eugene; University of Oregon, Eugene; Fred Hutchinson Cancer Center, Seattle kimmel@uoneuro.uoregon.edu Segmental patterning provides for evolvability, and hence is of great evo devo interest. Two prominent series of segments lie almost in register in the […]

Meeting Abstract S2-1.4  Thursday, Jan. 3  Segmentation of neurogenic placodes SCHLOSSER, Gerhard; Brain Research Institute, University of Bremen, 28334 Bremen, Germany gschloss@uni-bremen.de One of the distinguishing features of the vertebrate head is its branchiomeric segmentation with matching segmental units in pharyngeal endoderm and ectoderm (e.g. neural crest streams, rhombomeres). Here I review briefly how segmentation is established […]

Meeting Abstract S2-1.5  Thursday, Jan. 3  Neuromeres segmentation and trigeminal nerve projections in the developing vertebrate brain MURAKAMI, Yasunori; Ehime University bothrops@sci.ehime-u.ac.jp Vertebrate brains exhibit remarkable diversity in each animal group, reflecting evolutionary changes at the molecular-level developmental program of the nervous system that vertebrates have experienced. We focused on the developmental morphological plan of the brain […]

Meeting Abstract S2-1.7  Thursday, Jan. 3  Neural Crest Segments in Zebrafish SCHILLING, T.F.; Univ. of California, Irvine tschilli@uci.edu In the vertebrate head, cranial neural crest (NC) cells migrate from specific segmental levels of the hindbrain to form skeletal elements of the pharyngeal arches, as well as segmentally organized neurons and glia of the peripheral nervous system. Our […]

Meeting Abstract S2-1.6  Thursday, Jan. 3  Head organization and the head/trunk relationship in protochordates: problems and prospects LACALLI, T.C.; Univ. of Victoria, Victoria, B.C. lacalli@uvic.ca The fossil record is an invaluable aid for reconstructing the major events of vertebrate evolution. Because there is no comparable record for invertebrate chordates, we have no way of directly testing hypotheses […]

Meeting Abstract S2-1.2  Thursday, Jan. 3  Amphioxus and the Evolution of Head Segmentation HOLLAND, L. Z.*; RASMUSSEN, S. L. K.; BEASTER-JONES, L.; KOOP, D.; Univ. of California at San Diego; Univ. of California at San Diego; Univ. Calif. San Diego, Augustana College; Univ. of California at san Diego lzholland@ucsd.edu In the basal chordate amphioxus (Branchiostoma), all three […]

Meeting Abstract S2-1.1  Thursday, Jan. 3  A Brief History of Theories Regarding Vertebrate Head Organization NORTHCUTT, R. Glenn; University of California, San Diego rgnorthcutt@ucsd.edu In vertebrate heads, morphology is extremely complex and comprises numerous iterative structures arising from all embryonic germ layers. The search for a fundamental plan uniting these serial structures dates back 200 years. The […]