BIOL 595 12-3-09 (F 2009)

BIOL 595 12-3-09 (F 2009) - BIOL 595 Organogenesis:...

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Unformatted text preview: BIOL 595 Organogenesis: Somitogenesis (I) 12-03-09 The Formation of Vertebrate Body Segmentation (Somitogenesis) Mesodermal Progenitor Cells (MPCs) Somite s Cross-section of Frog Embryo after Neurulation Figure 4.3 Page151 Somites are developed from ventro-lateral mesoderm (paraxial mesoderm) Somites Give rise to: 1)Bone 2)Cartilage of the trunk 3)Skeletal muscles 4)Dermis of the skin on the dorsal side of the body Pre-somitic Mesoderm An Region of Unsegmented Mesoderm Somite Number Bewteen Different Vertebrates Highly variable For examples: Birds and Humans have about 50 somites Zebrafish have about 30 somites Snakes can have up to several hundred Somite formation per cycle Chick – 90 minutes Mouse – 120 minutes Xenopus – 45 minutes Zebrafish – 30 minutes Temporal Order of Somite Formation Figure 4.4 Page 152 Somite formation is an autonomous process Somite Formation in the Chick Formation of somites provides much of the body’s antero-posterior organization Figure 4.5 Page 153 Somitogenesis in Live Zebrafish Embryo...
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This note was uploaded on 01/27/2010 for the course BIOL 595 taught by Professor Staff during the Spring '08 term at Purdue.

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BIOL 595 12-3-09 (F 2009) - BIOL 595 Organogenesis:...

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