anterior fontanelle
Noun: * The diamond-shaped space on the top of an infant's skull, at the junction of the frontal and parietal bones, that closes during the second year of life. This is the largest and most prominent of the membranous gaps (fontanelles) in a baby's skull, allowing for brain growth and molding during childbirth. It corresponds to the anatomical landmark called the bregma after the skull bones have fully fused.
The term is used specifically in medical, anatomical, and pediatric contexts to describe a normal physiological feature of a newborn's anatomy. * The pediatrician palpated the anterior fontanelle to check the baby's hydration and intracranial pressure. * A sunken anterior fontanelle can be a sign of dehydration in an infant. * The anterior fontanelle typically closes between 12 and 18 months of age.
- Clinical Assessment: The anterior fontanelle's state (e.g., bulging, sunken, tense) is a crucial clinical sign for assessing conditions like hydrocephalus, meningitis, or dehydration.
- A bulging anterior fontanelle requires immediate medical evaluation.
- Fontanelle (noun): The general term for any soft, membranous space between the cranial bones of an infant's skull.
- Bregma (noun): The anatomical point on the skull where the coronal and sagittal sutures meet; it is the precise location of the anterior fontanelle after ossification.
- Posterior fontanelle (noun): The smaller, triangular fontanelle at the back of an infant's skull, which closes much earlier (usually by 2-3 months of age).
- Soft spot (informal, general term): This common layperson's term can refer to any fontanelle but most often specifically means the anterior fontanelle due to its size and prominence.
- "Be careful of the baby's soft spot" usually refers to the anterior fontanelle.
- No direct idioms or phrasal verbs are associated with this specific anatomical term.
- corresponds to the bregma when bones have ossified