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Vertebrae are segmentally repeated because of the primary segmentation of the myotomes.
Vertebrae are segmentally repeated because of the primary segmentation of the myotomes.
True
In its development, the endoskeleton typically passes through two stages: mesenchyme and bone.
In its development, the endoskeleton typically passes through two stages: mesenchyme and bone.
False
The mesenchymal stage is also known as the membranous stage.
The mesenchymal stage is also known as the membranous stage.
True
In lower vertebrates, the endoskeleton may remain wholly or partly ossified.
In lower vertebrates, the endoskeleton may remain wholly or partly ossified.
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Calcified cartilage is commonly found in most vertebrates during development.
Calcified cartilage is commonly found in most vertebrates during development.
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Bone produced by replacing pre-existing cartilage is known as membranous bone.
Bone produced by replacing pre-existing cartilage is known as membranous bone.
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Investigation of the vertebrate skeleton development shows that all bones arise directly from the mesenchyme.
Investigation of the vertebrate skeleton development shows that all bones arise directly from the mesenchyme.
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The accumulation of mesenchyme in the skeletogenous regions signifies the beginning of the cartilage stage in endoskeleton development.
The accumulation of mesenchyme in the skeletogenous regions signifies the beginning of the cartilage stage in endoskeleton development.
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In most vertebrates, the cartilage is entirely replaced by bone during development.
In most vertebrates, the cartilage is entirely replaced by bone during development.
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The skeleton is said to be ossified when it retains its cartilaginous composition.
The skeleton is said to be ossified when it retains its cartilaginous composition.
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