Development of Visceral Smooth Muscles.- 1 Early Appearance of Smooth Muscles.- 2 Timing of Smooth Muscle Development.- 3 Morphology of Developing Smooth Muscles.- 4 Cytological Differentiation.- 5 Chemical Differentiation.- 6 Growth of Visceral Smooth Muscles.- 7 Cell Division and Increase in Cell Number.- 8 Extracellular Materials and Vascularization.- 9 Origin of Smooth Muscle Precursors.- 10 Influence of Endothelium, Epithelium, Connective Tissue and Nerves on Smooth Muscle Development.- 10.1 Role of Endothelium and Epithelium.- 10.2 Role of Mesenchymal Cells and the Extracellular Matrix.- 10.3 Role of Nerves.- 11 Development of Mechanical Activity.- 12 Related Processes of Development and Growth.- 13 Synopsis.- References.- Mammalian Smooth Muscle Differentiation: Origins, Markers and Transcriptional Control.- 1 Introduction.- 2 Smooth Muscle Cell Ontogeny.- 2.1 Evolutionary Concepts.- 2.2 Embryological Origins of SMC.- 2.3 Models for Studying SMC Differentiation.- 3 Molecular Definitions of Smooth Muscle Cell Lineages.- 3.1 SMC-Restricted Markers.- 3.2 SMC-Restricted Promoter Activity.- 4 Future Perspectives.- References.- The Genetics of Murine Skeletal Muscle Biogenesis.- 1 Introduction.- 2 The Restriction of Cell Fate and Views on Cell Determination.- 3 The Somite Is a Source of Multiple Cell Types.- 4 The Acquisition of Cell Fate in the Somite: Myf5 and Myod Confer Skeletal Muscle Identity.- 5 Subpopulations of Stem Cells Migrate from the Somite to the Limb.- 6 Extrinsic Factors Direct Cell Identity in the Somite.- 7 Manipulations of the Myf5 Locus and Distal Rib Phenotypes: the Complexities of Gene Regulation.- 8 Conclusions.- References.- Somite Patterning: a Few More Pieces of the Puzzle.- 1 Introduction.- 2 Segmental Plate Morphology.- 3 Somite Differentiation.- 3.1 Muscle Formation.- 3.1.1 Epaxial and Hypaxial Muscle Derivatives.- 3.1.2 A Distinct Embryonic Origin for Epaxial and Hypaxial Muscles?.- 3.1.3 Epaxial Muscle Formation.- 3.1.4 Hypaxial Musclc#