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*''Somitogenesis; the formation of somites.''
 
*''Somitogenesis; the formation of somites.''
#Paraxial mesoderm forms during gastrulation.
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#Paraxial mesoderm forms during [[Developmental Biology - Gastrulation - Anatomy & Physiology|gastrulation]].
 
#It forms a mesenchymal ''pre - somitic mesoderm'' tissue starting at the anterior and moving posteriorly.
 
#It forms a mesenchymal ''pre - somitic mesoderm'' tissue starting at the anterior and moving posteriorly.
 
#At the anterior, the pre - somitic mesoderm becomes organsised into blocks of cells called '''somitomeres'''.
 
#At the anterior, the pre - somitic mesoderm becomes organsised into blocks of cells called '''somitomeres'''.
 
#*Somitomeres are compacted and cells undergo a mesenchymal to epithelial transition.  
 
#*Somitomeres are compacted and cells undergo a mesenchymal to epithelial transition.  
#*They then separate from the rest of the pre - somitic mesoderm to from somites.
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#*Somitomeres then separate from the rest of the pre - somitic mesoderm to from somites.
#As somites "bud off" at the anterior, more pre - somitic mesoderm develops posteriorly. This means that the total length of the pre - somitic mesoderm remains constant.
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#As somites "bud off" at the anterior, more pre - somitic mesoderm develops posteriorly. Thus, the total length of the pre - somitic mesoderm remains constant.
    
*Pre - somitic mesoderm forms somites at regular intervals; one forms every 90 minutes.
 
*Pre - somitic mesoderm forms somites at regular intervals; one forms every 90 minutes.
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