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Which Fontanelle Closes First?

Sophia Al-Mansoor • • 7 min read
Which Fontanelle Closes First?

The posterior fontanelle

posterior fontanelle
Anatomical terminology. The posterior fontanelle (lambdoid fontanelle, occipital fontanelle) is a gap between bones in the human skull (known as fontanelle), triangular in form and situated at the junction of the sagittal suture and lambdoidal suture. It generally closes in 6–8 weeks from birth.
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usually closes first, before the anterior fontanelle, during the first several months of an infant's life.

Which Fontanel is largest and when does it close?

The anterior fontanel is the largest and most important for clinical evaluation. The average size of the anterior fontanel is 2.1 cm, and the median time of closure is 13.8 months.

Which fontanelle closes last in a child?

In humans, the sequence of fontanelle closure is as follows: 1) posterior fontanelle generally closes 2-3 months after birth, 2) sphenoidal fontanelle is the next to close around 6 months after birth, 3) mastoid fontanelle closes next from 6-18 months after birth, and 4) the anterior fontanelle is generally the last to ...

Sophia Al-Mansoor
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Sophia Al-Mansoor

Sophia analyzes international trade, startup ecosystems, retail transformation, and supply chain logistics for modern digital publications.