Where is the Location of the Xinmen?

The fontanelles are divided into anterior and posterior parts. The anterior fontanelle is located at the top of the head and is a rhomboid gap formed by the suture between the two frontal bones and the two parietal bones. The posterior fontanelle is close to the occipital region and is a triangular gap formed by the suture between the two parietal bones and the occipital bone. The fontanelles are important indicators for the growth and development of infants and young children. Premature or delayed closure can indicate the presence of certain diseases. It is recommended to take the child to see a doctor as soon as possible. During skull development, in addition to head circumference, the degree of ossification of the skull should also be measured based on the closure time of the anterior and posterior fontanelles and the sutures. The anterior fontanelle is a rhomboid gap formed by the frontal and parietal bones. At birth, its oblique diameter is 1.5-2cm. The size of the anterior fontanelle varies greatly among individuals. In the first few months after birth, it increases with the increase of head circumference, gradually decreases after 6 months, and generally closes at 12-18 months after birth. In some children, it may be delayed until about 2 years of age. The posterior fontanelle is formed by the suture between the parietal bone and the occipital bone and is triangular. It closes at birth or within 2-3 months after birth. If the anterior fontanelle cannot be felt at birth, it is necessary to distinguish whether it is due to skull deformity. Premature closure of the fontanelles is seen in microcephaly, while delayed closure needs to be distinguished from rickets, hydrocephalus, hypothyroidism, etc. The baby's anterior fontanelle is originally flat. If it suddenly bulges up, especially when the baby cries, and feels tight when touched with hands, accompanied by fever, vomiting, or even convulsions, it indicates that the intracranial pressure of the baby has increased. Usually, increased intracranial pressure is caused by intracranial infection, and the baby may be suffering from various meningitis, encephalitis and other diseases.