The anterior or frontal fontanelle (or fontanel) is the diamond-shaped soft membranous gap at the junction of the coronal and sagittal sutures. It persists until approximately 18-24 months after birth, after which it is known as the bregma. The fontanelle normally measures between 0.6-3.6 cm (mean 2.1 cm) 2. It is the largest of the fontanelles and is the main sonographic window for performing cranial ultrasound.
- 1. D'Antoni AV, Donaldson OI, Schmidt C, Macchi V, De Caro R, Oskouian RJ, Loukas M, Shane Tubbs R. A comprehensive review of the anterior fontanelle: embryology, anatomy, and clinical considerations. (2017) Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery. 33 (6): 909-914. doi:10.1007/s00381-017-3406-1 - Pubmed
- 2. Kiesler J, Ricer R. The abnormal fontanel. (2003) American family physician. 67 (12): 2547-52. Pubmed