What does the posterior fontanelle become after it closes?

What does the posterior fontanelle become after it closes?

• A. Lambda
• B. Bregma
• C. Pterion
• D. Asterion

Answer: (A)

The posterior fontanelle is at the back of the infant’s skull, where the sagittal and lambdoid sutures meet. When it closes, the bones fuse at that junction and form the external skull landmark known as the lambda. This point marks the intersection of the sagittal and lambdoid sutures on the skull. The anterior fontanelle, by contrast, corresponds to the bregma, the junction of the sagittal and coronal sutures, while other landmarks like pterion and asterion denote different suture intersections near the temple and the back of the skull.

The posterior fontanelle is at the back of the infant’s skull, where the sagittal and lambdoid sutures meet. When it closes, the bones fuse at that junction and form the external skull landmark known as the lambda. This point marks the intersection of the sagittal and lambdoid sutures on the skull. The anterior fontanelle, by contrast, corresponds to the bregma, the junction of the sagittal and coronal sutures, while other landmarks like pterion and asterion denote different suture intersections near the temple and the back of the skull.