Wormian bones are a normal anatomical variant of the skull, which often lie within the suture lines. Hence, they generally go unnoticed [1]. Less common is a Wormian bone within the anterior fontanelle of a newborn child. The fontanelles are important for normal growth of a child's head.

Are wormian bones bad?

Wormian bones can be considered an abnormal anatomical variant, although they occur more frequently in certain bone dysplasia conditions including osteogenesis imperfecta, rickets, cleidocranial dysostosis, and pycnodysostosis [3-4].

What does Wormian bone mean?

Wormian bones are a subset of the small intrasutural bones that lie between the cranial sutures formed by the bones of the skull vault. They are formed due to additional ossification centres in or near sutures. They are usually considered as normal variants and seem to be determined genetically in certain populations.

Does everyone have wormian bones?

Usually, not more than several are found in a single individual, but more than one hundred have been once found in the skull of a hydrocephalic adult. Wormian bones are a marker for some diseases and important in the primary diagnosis of brittle bone disease: osteogenesis imperfecta.

Are wormian bones hereditary?

It thus appears doubtful that wormian bones are inherited per se, but instead that their ap- pearance depends in part on the genetic factors controlling the growth and devel- opment of the cranial base in general and the basi-occiput in particular.

Almost Fooled by Wormian Bones

29 related questions found

How common are wormian bones?

In our study, wormian bones were found to be very common given that they were identified in 320 patients, or 53% of the CT scans carried out, with a number per CT scan ranging from one (110 scans) to eight (five scans).

What causes osteopetrosis?

The X-linked type of osteopetrosis, OL-EDA-ID, results from mutations in the IKBKG gene. In about 30 percent of all cases of osteopetrosis, the cause of the condition is unknown. The genes associated with osteopetrosis are involved in the formation, development, and function of specialized cells called osteoclasts.

What is the weakest part of the skull?

Clinical significance

The pterion is known as the weakest part of the skull. The anterior division of the middle meningeal artery runs underneath the pterion. Consequently, a traumatic blow to the pterion may rupture the middle meningeal artery causing an epidural haematoma.

What are Craniotabes?

Craniotabes is a softening of the skull bones.

What is craniosynostosis?

Craniosynostosis is a birth defect in which the bones in a baby's skull join together too early. This happens before the baby's brain is fully formed. As the baby's brain grows, the skull can become more misshapen.

Who discovered Wormian bones?

Wormian bones form as a result of extra ossification centers in utero. These bones, named in honour of the Dutch anatomist Olaus Wormius by Thomas Bartholin, are commonly found in the pediatric population with reports stating as much as 53% of children having radiographic evidence of one or more [1].

Do fontanelles become sutures?

Joints made of strong, fibrous tissue (cranial sutures) hold the bones of your baby's skull together. The sutures meet at the fontanels, the soft spots on your baby's head. The sutures remain flexible during infancy, allowing the skull to expand as the brain grows.

What is sesamoid bone example?

Sesamoid bones are bones embedded in tendons. These small, round bones are commonly found in the tendons of the hands, knees, and feet. Sesamoid bones function to protect tendons from stress and wear. The patella, commonly referred to as the kneecap, is an example of a sesamoid bone.

Can you be born without collarbones?

Some people don't develop collarbones; they can be born without them, have defective ones, or grow them at an older age. This abnormality is one of the symptoms of a rare disorder known as cleidocranial dysplasia. This condition consists of the malformation, delayed growth, or even absence of some bones and teeth.

What is lambdoid craniosynostosis?

Lambdoid. Lambdoid synostosis is a rare type of craniosynostosis that involves the lambdoid suture, which runs along the back of the head. It may cause one side of your baby's head to appear flat, one ear to be higher than the other ear and tilting of the top of the head to one side.

At what age does the metopic suture close?

Our results showed that earliest closure of metopic suture occurred at three months and complete metopic suture closure in all patients occurred by nine months of age. Furthermore, approximately 33% showed complete suture closure a three months, 60% at five months, 65% at 7 months, and 100% by nine months of age.

Is Craniotabes permanent?

Craniotabes may lead to permanent posterior flattening or lateral and asymmetrical deformities of the skull, due to pressure of the head against the supporting surface in the prone position.

How do you describe Cephalohematoma?

The most obvious sign of a cephalohematoma is a soft, raised area on the newborn's head. A firm, enlarged unilateral or bilateral bulge on top of one or more bones below the scalp characterizes a cephalohematoma. The raised area cannot be transilluminated, and the overlying skin is usually not discolored or injured.

Do skulls have ear holes?

External acoustic meatus (ear canal)—This is the large opening on the lateral side of the skull that is associated with the ear. Internal acoustic meatus—This opening is located inside the cranial cavity, on the medial side of the petrous ridge. It connects to the middle and inner ear cavities of the temporal bone.

Which bones form the upper jaw?

Each of the following facial bones are paired: the maxillae form the upper jaw and front of the hard palate; the zygomatic bones form the cheeks; the nasal bones form the bridge of the nose; the lacrimal bones form part of the orbit, or eye socket; the palatine bones form the rear of the hard palate and the inferior ...

What bones meet at the Asterion?

The asterion is an anatomical landmark on the lateral aspect of the skull formed at the junction of the occipital bone, the temporal bone, and the parietal bone.

Is osteopetrosis serious?

The most severe type of osteopetrosis, malignant infantile type, is apparent from birth, and if left untreated, can lead to death in the first decade of life. Symptoms vary depending on the exact gene change (mutation). Affected individuals may have an abnormally large head (macrocephaly).

Is osteopetrosis life threatening?

Osteopetrosis congenita results in bone marrow failure and is almost always fatal. Marble bone disease causes short stature, cerebral calcification and mental retardation.