Mesoderm Quiz

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Here are a few simple questions that relate to mesoderm development. Take the quiz and see what you know, if you get some wrong, try working through through the Embryology Lecture on Mesoderm.

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1. Mesenchyme refers to the middle layer of the trilaminar embryo

true
false
The the middle layer of the trilaminar embryo is the mesoderm (meaning middle layer), while most of these cells are mesemchymal in appearance, this term is used to describe the cell histological appearance/organization.

2. The intraembryonic coelom forms within :

somites
lateral plate
neural tube
intermediate mesoderm
The intraembryonic coelom forms initially small spaces in the mesoderm layer and coalesce to form a single large "horseshoe-shaped" space within the lateral plate mesoderm around the embryonic disc. Both young somites (somitocoels) and the neural tube (neural tube lumen) do have cavities, but neither is called the intraembryonic coelom. Note that in early development the intraembryonic coelom opens at places on the edge of the embryonic disc to the extraembryonic coelom.

3. All paraxial mesoderm segments into somites.

true
false
While somites do form within paraxial mesoderm, this region remains unsegmented at the level of the head and therefore does not incorporate into somites.

4. Somites are developmental structures that contribute the following adult structures :

vertebra, notochord, dermis, skeletal muscle
vertebra, intervertebral discs, dermis, skeletal muscle
kidney, body wall connective tissue, sensory ganglia
kidney, gastrointestinal tract smooth muscle, mesentry
Each somite has specific regions that contribute different components of the embryo. Sclerotome contributes the vertebral column (vertebra, intervertebral discs). Dermotome contributes the connective tissue layers of the skin (dermis, hypodermis). Myotome ontributes the skeletal muscle of the body and limbs.

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