INBDE (Integrated National Board Dental Examination) Practice Exam

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Which synchondroses is the last to become inactive?

  1. Sphenoid-occipital

  2. Intersphenoid

  3. Spheno-ethmoid

  4. Fronto-ethmoid

The correct answer is: Sphenoid-occipital

The last synchondrosis to become inactive is the sphenoid-occipital synchondrosis. This is because the sphenoid-occipital synchondrosis is the final connection between the sphenoid bone and the occipital bone to ossify, or turn into hard bone. The other options, such as the intersphenoid, spheno-ethmoid, and fronto-ethmoid synchondroses, become inactive earlier in the development process, as they are responsible for connecting different bones in the skull and typically ossify before the sphenoid-occipital synchondrosis. Therefore, the sphenoid-occipital synchondrosis is the last to become inactive.

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