Which of the following statements concerning the tympanic cavity is correct?
A. It is of endodermal origin
B. It develops from pharyngeal pouch 3
C. The malleus and incus develop from pharyngeal arch 3
D. The stapes develops from pharyngeal arch 4
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Showing posts with label Embryology MCQS. Show all posts
Showing posts with label Embryology MCQS. Show all posts
Friday, April 24, 2009
Embryology MCQ 02
Friday, April 24, 2009
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Tuesday, March 25, 2008
Embryology MCQ 01
Tuesday, March 25, 2008
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What is the origin of the definitive myocardium of the adult heart?
A. Endoderm
B. Somatopleuric mesoderm
C. Hypoblast
D. Splanchnopleuric mesoderm
Monday, April 24, 2000
Embryology MCQ Answer 02
Monday, April 24, 2000
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The Correct option is A
The middle ear (tympanic cavity and auditory tube) are derived from endoderm of the 1st pharyngeal pouch. The ossicles are formed from the first pouch (malleus and incus) and the second pouch (stapes) and attach to the tympanic membrane. Read More »»
Saturday, March 25, 2000
Embryology MCQ Answer 01
Saturday, March 25, 2000
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The Correct Answer is D
Myocardium - The myocardium, or cardiac muscle arises from splanchnopleuric mesoderm that invests the primary heart tube. The myocardium secretes the cardiac jelly and gives rise to the conduction system.
Epicardium (visceral pericardium) - This outer tunic of thin serous membrane covers the myocardium. It is derived from splanchnopleuric mesoderm and also forms the coronary vessels.
Endocardium - This lining of the heart tube is derived from the lateral endocardial tubes. It consists of endothelium and a thin subendothelial connective tissue.
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