Posterior fontanelle

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The posterior fontanelle or occipital fontanelle is the triangular soft membranous gap (fontanelle) at the junction of the lambdoid and sagittal sutures. It persists until approximately 2-3 months after birth, after which it is known as the lambda. It can be used as an additional sonographic window for performing cranial ultrasound to improve visualization of dependently layering intraventricular hemorrhage.