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AskHello doctor. Please tell me more about the fontanelle in babies
Ha Van That (1986)
Answer
The fontanelle in babies (also known as the crown of the head) is divided into 2 parts: anterior and posterior fontanelles. The anterior fontanelle is a diamond-shaped opening between the frontal bone and the crown bone. The posterior fontanelle is triangular in shape, the opening between the top bone and the occipital bone. The fontanelle is shaped like a parallelogram, measuring from 0.5 x 0.5cm to 3 x 3cm. The largest size and the smallest size have a pretty big difference for many different reasons. Part of that is due to the size of the baby's head. Another part is genetic. The neonatal fontanelle has a fibrous membrane structure that holds the bones of the head together and is also an elastic seam between the bones of the skull. Thanks to these fibrous membranes, the baby's head can change its size and shape to suit the mother's vaginal tract for a more favorable birth. Besides, when the baby is born, the fontanelle also acts as a cushion to protect the baby's brain from external shocks if it falls.
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