Skull at birth, showing frontal and occipital fonticuli
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. A delay in closure is associated with congenital hypothyroidism.
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