Question:

Single best answer: Structures of the middle and external ear involved in hemifacial microsomia are developing from:
1. the first and second branchial arch.
2. the first branchial arch only.
3. the second pharyngeal pouch.
4. the first, second branchial arch and the first pharyngeal pouch.
5. the second branchial arch only.





Answer:

The correct answer for the question "Single best answer: Structures of the middle and external ear involved in hemifacial microsomia are developing from:" is:

4. the first, second branchial arch and the first pharyngeal pouch.



Explanation

a. As the middle and external ear develops from the first and second branchial arch and the endodermal first pharyngeal pouch starting in the 4th gestational week, structures arising from these origins are involved in HFM. The first and the second branchial arch originate into the ossicular chain.The first and the second branchial arch originate into the ossicular chain.

b. As the middle and external ear develops from the first and second branchial arch and the endodermal first pharyngeal pouch starting in the 4th gestational week, structures arising from these origins are involved in HFM. The first and the second branchial arch originate into the ossicular chain.

c. As the middle and external ear develops from the first and second branchial arch and the endodermal first pharyngeal pouch starting in the 4th gestational week, structures arising from these origins are involved in HFM. The first and the second branchial arch originate into the ossicular chain.

d. As the middle and external ear develops from the first and second branchial arch and the endodermal first pharyngeal pouch starting in the 4th gestational week, structures arising from these origins are involved in HFM.

e. As the middle and external ear develops from the first and second branchial arch and the endodermal first pharyngeal pouch starting in the 4th gestational week, structures arising from these origins are involved in HFM. The first and the second branchial arch originate into the ossicular chain.



From the manuscript:
Congenital hearing loss explained in adulthood. Computed tomography of the temporal bone in hemifacial microsomia. A case report.
Radiology Case. 2009 Oct; 3(10):1-4


This article belongs to the Neuro section.




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From the manuscript

Congenital hearing loss explained in adulthood. Computed tomography of the temporal bone in hemifacial microsomia. A case report.

Free full text article: Congenital hearing loss explained in adulthood. Computed tomography of the temporal bone in hemifacial microsomia. A case report.

Abstract
We present a case of complex hemifacial microsomia (HFM) which was diagnosed at the age of 46 years. Imaging findings of a complex deformity of the temporal bone are presented and connected to a broad range of clinical symptoms. Computed tomography (CT) imaging indications are discussed briefly.






References



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