fontanelle
Pronunciation: fon-tuh-NEL
Soft spots on an infant's skull where bone formation is incomplete, allowing for brain growth and passage through the birth canal.
Full Definition
Fontanelles are membrane-covered spaces between the bones of an infant's skull where ossification is not yet complete. The anterior fontanelle (diamond-shaped, closes by 12-18 months) and posterior fontanelle (triangular, closes by 2-4 months) are the most clinically significant. These soft spots allow for brain growth during rapid development and facilitate molding during passage through the birth canal. Examination of fontanelles provides important information about intracranial pressure, hydration status, and normal development. Abnormal fontanelle appearance may indicate various pathological conditions.
Usage
Usage note: Note the double 'l' in standard medical spelling. May be qualified as anterior, posterior, or lateral.
In Context
- "The anterior fontanelle was soft and flat, measuring 3cm in diameter." — Newborn examination
- "Bulging fontanelles suggested increased intracranial pressure." — Pediatric assessment