BIOL 1F25 Lecture Notes - Tx Network, Bind, Mef2

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Skeletal syncitial differential splicing different muscle fiber isoforms. Smooth not syncitial, not striated; random actin-myosin arr. Myoepithelial iris dilator, mammary, salivary, sweat glands; important for secretion. Paraxial mesoderm axial skeleton skeletal muscle dermis initially forms somitomere whorls somitomeres (mesenchymal) somites (epithelial) first 7 remain somitomeres and form face/throat musc. 37 total somite pairs form in humans ventral, lateral plate mesoderm splanchnopleuric cardiac/smooth muscle (dorsal, lateral plate somatopleuric mesoderm) paraxial mesoderm somitomere somites lateral plate. Somite differentiation occurs anterior to posterior ventral sclerotome axial skeleton, skull medial myotome myogenic cells . 2. dorsal epimere (spine muscles) dorsal dermotome dermis sclerotome myotome, myogenic dermotome. Head musculature: all muscle from paraxial mesoderm (somitomeres and somites) Limb musculature: derived from lateral somites only involves migration into the limb buds upon arrival, myogenic cells are arranged dorso-ventrally later, patterns are determined by connective tissue contact medial portion of somites gives rise to axial muscles. Skeletal muscle lineage: smooth muscle: epiblast epiblast .

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