INBDE (Integrated National Board Dental Examination) Practice Exam

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At what age does the spheno-ethmoid synchondrosis become inactive?

  1. 7

  2. 3

  3. 10

  4. 5

The correct answer is: 7

The spheno-ethmoid synchondrosis is a fibrocartilaginous joint located between the sphenoid and ethmoid bones in the skull. It plays an important role in growth and development of the skull during childhood. As a person grows and matures, this joint becomes fully ossified, or converted into bone, at the age of 7. This signifies the end of growth and development of the skull in terms of the spheno-ethmoid synchondrosis. Therefore, options B, C, and D are incorrect, as they suggest earlier or later ages when this joint becomes inactive.

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