WordNet

of or near the head end or toward the front plane of a body
earlier in time (同)prior

PrepTutorEJDIC

(場所などが)前の,前部の;(…より)前に位置する《+『to』+『名』》 / (時・事件などが)以前の,先の;(…より)前の《+『to』+『名』》

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/03/02 04:23:51」(JST)

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The anterior fontanelle (bregmatic fontanelle, frontal fontanelle) is the largest fontanelle, and is placed at the junction of the sagittal suture, coronal suture, and frontal suture; it is lozenge-shaped, and measures about 4 cm in its antero-posterior and 2.5 cm in its transverse diameter. The fontanelle allows the skull to deform during birth to ease its passage through the birth canal and for expansion of the brain after birth.

While the posterior and lateral fontanelles are obliterated by about six months after birth, the anterior is not completely closed until about the middle of the second year. Full ossification starts in the late twenties and finishes before the age of 50 .

Clinical significance

The anterior fontanelle is useful clinically. Examination of an infant includes palpating the anterior fontanelle. A sunken fontanelle indicates dehydration, whereas a very tense or bulging anterior fontanelle indicates raised intracranial pressure. However, this is not a certain indicator for raised pressure as prolonged crying by the baby may produce the same effect. A full anterior fontanelle may also be indicative of neonatal meningitis, specifically acute bacterial meningitis.

Additional Images

Skull of newborn. Anterior view.

External links

-556793806 at GPnotebook
Anatomy image: skel/fetal2 at Human Anatomy Lecture (Biology 129), Pennsylvania State University

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English Journal

Study on the influence of the fetus head molding on the biomechanical behavior of the pelvic floor muscles, during vaginal delivery.

Silva ME1, Oliveira DA1, Roza TH1, Brandão S2, Parente MP3, Mascarenhas T4, Natal Jorge RM1.
Journal of biomechanics.J Biomech.2015 Jun 25;48(9):1600-5. doi: 10.1016/j.jbiomech.2015.02.032. Epub 2015 Feb 26.
Pelvic floor injuries during vaginal delivery are considered a significant risk factor to develop pelvic floor dysfunction. The molding of the fetus head during vaginal delivery facilitates the labor progress, since it adjusts to the birth canal geometry. In this work, a finite element model was use
PMID 25757665

The Incidence and Topographic Distribution of Sutures Including Wormian Bones in Human Skulls.

Cirpan S1, Aksu F, Mas N.
The Journal of craniofacial surgery.J Craniofac Surg.2015 Jun 24. [Epub ahead of print]
OBJECTIVE: The Wormian Bones are accessory bones located within the cranial sutures and fontanelles. The present article examines the incidence of Wormian Bones and compares the number and topographic distribution between the sutures including Wormian Bones in skulls of West Anatolian Population.MET
PMID 26114515

Anterior fontanelle closure and size in full-term children based on head computed tomography.

Pindrik J1, Ye X1, Ji BG2, Pendleton C3, Ahn ES4.
Clinical pediatrics.Clin Pediatr (Phila).2014 Oct;53(12):1149-57. doi: 10.1177/0009922814538492. Epub 2014 Jun 11.
INTRODUCTION: This study investigates radiographically acquired normative ranges of anterior fontanelle closure (AFC) and surface area (SA) in healthy full-term infants.METHODS: High-resolution head computed tomography (CT) scans were retrospectively reviewed for AFC and AF dimensions to allow appro
PMID 24920348

「大泉門」

Anterior fontanelle
	Skull at birth, showing frontal and occipital fonticuli.
	Human anterior fontanelle 1 month
Details
Identifiers
Latin	fonticulus anterior
Dorlands; /Elsevier	f_12/12372487
TA	A02.1.00.028
FMA	75439
	Anatomical terminology [edit on Wikidata]