11-28-11 Segmentation, Somite Development, and Myogenesis

11-28-11 Segmentation, Somite Development, and Myogenesis -...

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ZOL320 Developmental Biology November 28, 2011 Segmentation, Somite Development, and Myogenesis Compartments and segments commonly used in embryos to specify position and by their modification make new phenotypes Compartments form an invisible anatomy present in embryos Compartments are parts set aside in the embryo but not related to obvious anatomical distinction o Example: Amphioxus and muscular bands Compartments: o Evolved early in phylogeny o Found in cell embryos o May not correlate with obvious morphological divisions (invisible anatomy) o Identified experimentally (by gene expression pattern boundaries or failure of cells to cross some boundary, or to regulate) I. Segmentation is obvious in mesodermally derived somites 5 types of mesoderm to consider: Mesoderm Derivatives (but really only four?) 1. Intermediate mesoderm a. Kidneys b. Gonads 2. Chordamesoderm notochord 3. Paraxial mesoderm (aka segmental plate mesoderm – creates epaxial and hypaxial muscles) a. Head
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This note was uploaded on 12/21/2011 for the course ANP 203 taught by Professor Lewis during the Fall '11 term at UCSB.

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11-28-11 Segmentation, Somite Development, and Myogenesis -...

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