Question:
When does the basiocciput fuse with the basisphenoid?
When does the basiocciput fuse with the basisphenoid?
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The spheno-occipital synchondrosis closes in the late teens to about 21 years.
Updated On: Jun 24, 2026
- 18 to 22 years
- 22 to 25 years
- 14 to 16 years
- 12 to 14 years
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The Correct Option is A
Solution and Explanation
Step 1: The spheno-occipital synchondrosis is the cartilaginous joint between the basisphenoid and the basiocciput at the base of the skull, and its fusion is an important marker for age estimation.
Step 2: This joint fuses at about 18 to 21 years (commonly quoted as 18 to 22 years). Therefore the correct option is 18 to 22 years.
Step 3: The other ranges are too early. Fusion at 12 to 14 or 14 to 16 years would underestimate the age, and 22 to 25 years overshoots the usual closure window, so options (b), (c) and (d) are wrong.
Step 4: Hence the basiocciput fuses with the basisphenoid at 18 to 22 years.
Step 2: This joint fuses at about 18 to 21 years (commonly quoted as 18 to 22 years). Therefore the correct option is 18 to 22 years.
Step 3: The other ranges are too early. Fusion at 12 to 14 or 14 to 16 years would underestimate the age, and 22 to 25 years overshoots the usual closure window, so options (b), (c) and (d) are wrong.
Step 4: Hence the basiocciput fuses with the basisphenoid at 18 to 22 years.
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