Mesoderm Quiz: Difference between revisions

@@ Line 31: / Line 31: @@
 - 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.
+|| 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.
-{Which of the following :
+{Which of the following statements about somites is/are correct:
-|type="()"}
-- somites
-+ lateral plate
-- neural tube
-- intermediate mesoderm
-||The [[I#intraembryonic_coelom|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 ([[S#somitocoel|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.
-{Question
 |type="[]"}
-+ Correct answer.
++ Differentiate a covering epithelium in their early stages.
-- Incorrect answer.
+- Somites contribute the body wall osteogenic, chrondrogenic and fibrogenic cells.
-+ Correct answer.
++ Contribute to a single vertebral level body and the intervertebral disc.
-- Incorrect answer.
+- Myotomes contribute the smooth muscle associated with the gastrointestinal tract wall.
+|| Paraxial mesoderm forming the early somite does initially form a transient epithelial layer that covers each somite. This layer breakdown with later development, allowing the somite components to disperse. The sclerotome component of each somite pair engulf the left and right side of the notochord forming the entire axial column, that includes the vertebra and intervertebral disc (from each somite). Somatic not somitic mesoderm forms the body wall osteogenic, chrondrogenic and fibrogenic cells. Don't mix up somatic/somitic. You may have had to think about this as the dermatome, forming the dermis and fibrogenic cells, does mix with somatic mesoderm later in development, but does not contribute either osteogenic or chrondrogenic cells. Myotomes contribute the skeletal muscle not smooth muscle. The GIT smooth muscle comes from splanchnic mesoderm.
 </quiz>

Revision as of 17:38, 15 August 2016

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.

Take the Quiz

1 Mesenchyme refers to the middle layer of the trilaminar embryo

	true
	false

2 The intraembryonic coelom forms within :

	somites
	lateral plate
	neural tube
	intermediate mesoderm

3 All paraxial mesoderm segments into somites.

	true
	false

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

5 Which of the following statements about somites is/are correct:

	Differentiate a covering epithelium in their early stages.
	Somites contribute the body wall osteogenic, chrondrogenic and fibrogenic cells.
	Contribute to a single vertebral level body and the intervertebral disc.
	Myotomes contribute the smooth muscle associated with the gastrointestinal tract wall.

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