sphenoidal fontanel
Học thuậtThân thiện
Definition
Noun: * Anatomical Structure: The sphenoidal fontanel is one of the soft, membranous gaps (fontanels) in the skull of a newborn or young infant. It is located on each side of the skull where the frontal bone, parietal bone, temporal bone, and the greater wing of the sphenoid bone meet. This area corresponds to the future pterion once the bones have fused through ossification.
Usage
The term is used exclusively in anatomical and medical contexts to describe a specific, normal feature of the infant skull. * The pediatrician checked the infant's sphenoidal fontanel during the routine examination. * Unlike the larger anterior fontanel, the sphenoidal fontanel is smaller and closes earlier in development.
Advanced Usage
- Clinical Significance: The sphenoidal fontanel, like other fontanels, allows for skull flexibility during birth and rapid brain growth in infancy. Its assessment (e.g., sunken or bulging) can provide clinical clues about the infant's hydration status or intracranial pressure.
- A bulging sphenoidal fontanel can be a sign of increased intracranial pressure and requires medical evaluation.
Variants and Related Words
- Sphenoid Fontanelle: An alternative spelling.
- Pterion: The anatomical landmark on the side of the skull where several cranial bones (frontal, parietal, temporal, and sphenoid) converge in an 'H'-shaped suture. This is the bony equivalent that forms after the sphenoidal fontanel closes.
- Fontanel / Fontanelle: The general term for any soft spot on an infant's skull. Other major fontanels include the anterior fontanel and posterior fontanel.
Synonyms
- Anterolateral Fontanel: This is a direct synonym, describing its location (anterior and lateral on the skull).
Related Terms (Not Synonyms)
- Suture: The fibrous joint between two cranial bones. Fontanels are the intersections of multiple sutures before ossification is complete.
- Ossification: The process of bone formation, which leads to the closure of the fontanel.
Noun
- the irregularly shaped area on either side of the cranium where the frontal bone and the anterior tip of the parietal bone and the temporal bone and the greater wing of the sphenoid bone meet; corresponds to the pterion when bones have ossified