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12 Cards in this Set

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Somitomere
Metameric pattern in the preaxial mesoderm that precedes the development of a somite.
In the head region 7 somitomeres are formed, which do not go on to form somites.
Somitogenesis
The development of a somite.
Somite
Mesodermal segments, formed in pairs in the early embryonic paraxial mesoderm, along the
length of the trunk.
Sclerotome
A group of mesenchymal cells that emerge from the ventromedial part of a somite. These
cells migrate toward the notochord where they form the vertebrae.
Rostral
Toward the snout end of the organism.
Prechordal
Located rostral to the notochord.
Mesoderm
The middle of the 3 germ layers. It gives rise to all connective tissues (except in the head
and neck regions), all body musculature, blood, cardiovascular and lymphatic systems, most of the
urogenital system and the lining of pericardial, pleural and peritoneal cavities.
Mesenchyme
A primordial embryonic connective tissue, consisting of stellate cells and a loose, fluid
extracellular matrix. Can originate from the mesoderm or from neural crest.
Epimere
Segment of myotome that is dorsal to the body axis.
Axial
Medial/midline: site of the prechordal plate and notochord.
Caudal
Toward the tail end of the organism.
Cephalic
Relating to the head or toward the head.