What are the two primary fontanelles of the fetal skull?

The two primary fontanelles of the fetal skull are the anterior and posterior fontanelles. The anterior fontanelle is located at the junction of the frontal and parietal bones and is the largest fontanelle, remaining open for a longer time during early infancy to allow for brain growth. The posterior fontanelle is found at the junction of the occipital and parietal bones and closes more quickly, typically within the first few months of life. These fontanelles are crucial for neonatal examination, as they provide insight into the baby's hydration status and cranial development. Their unique positions and characteristics are essential for healthcare providers to monitor during the developmental stages of a newborn.