What are the fontanelles of the skull?

May 19, 2020 Off By idswater

What are the fontanelles of the skull?

The spaces between the bones that remain open in babies and young children are called fontanelles. Sometimes, they are called soft spots. These spaces are a part of normal development. The cranial bones remain separate for about 12 to 18 months.

How many fontanelles are in the skull?

What are fontanelles? There are 2 fontanelles (the space between the bones of an infant’s skull where the sutures intersect) that are covered by tough membranes that protect the underlying soft tissues and brain.

What does a bulging fontanelle mean?

A tense or bulging fontanelle occurs when fluid builds up in the brain or the brain swells, causing increased pressure inside the skull. When the infant is crying, lying down, or vomiting, the fontanelles may look like they are bulging.

Why are there fontanelles in a neonate’s skull?

The primary reason for the existence of fontanelles is for child birth. The flexible and elastic sutures let the cranial bones overlap into a smaller and more compact form to allow it safe passage through the birth canal. Also the skull bones or cranium grows along with the brain.

Why are skull bones joined tightly together?

All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture (“to bind or sew”) strongly unites the adjacent skull bones and thus helps to protect the brain and form the face.

What is the purpose of Fontanelles?

Fontanel, also spelled fontanelle, soft spot in the skull of an infant, covered with tough, fibrous membrane. There are six such spots at the junctions of the cranial bones; they allow for molding of the fetal head during passage through the birth canal.

What is the other name of bregma?

Development. The bregma is known as the anterior fontanelle during infancy.

When does the fontanelle of the skull close?

Structure. During birth, fontanelles enable the bony plates of the skull to flex, allowing the child’s head to pass through the birth canal. The ossification of the bones of the skull causes the anterior fontanelle to close over by 9 to 18 months. The sphenoidal and posterior fontanelles close during the first few months of life.

What does the anterior fontanelle do to the brain?

Fontanelles allow for rapid stretching and deformation of the neurocranium as the brain expands faster than the surrounding bone can grow. Premature complete ossification of the sutures is called craniosynostosis. After infancy, the anterior fontanelle is known as the bregma.

What does a fontanelle in front of the fontanel mean?

This indicates a disorder – most commonly Down syndrome or congenital hypothyroidism (low levels of thyroid hormone ). This abnormal fontanelle is located in front of the posterior fontanel.

Where is the fontanelle located in the fetus?

Anterior fontanelle is a diamond-shaped membrane-filled space located between the two frontal and two parietal bones of the developing fetal skull. It persists until approximately 18 months after birth. It is at the junction of the coronal suture and sagittal suture.