INBDE (Integrated National Board Dental Examination) Practice Exam

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Which synchondroses becomes inactive first?

Intersphenoid
Spheno-ethmoid
Sphenoid-occipital
Fronto-ethmoid

The correct answer is: Intersphenoid

The synchondrosis is a type of joint where the bones are connected by hyaline cartilage. In this case, the correct answer is the intersphenoid synchondrosis due to the progression of cranial base fusion during development. The intersphenoid synchondrosis tends to be the first to ossify, becoming inactive first compared to the other options. Regarding the other options: - The spheno-ethmoid synchondrosis follows ossification after the intersphenoid. - The sphenoid-occipital synchondrosis and fronto-ethmoid synchondrosis also undergo ossification but at a later stage compared to the intersphenoid synchondrosis, making them incorrect in this context.