fontanelles


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fontanelles

The gaps between the bones of the vault of the growing skull of the baby and young infant that can be felt, as soft depressions on the top of the head, by gentle pressure with the fingers. The front (anterior) fontanelle lies at the junction of the two forehead (frontal) bones and the two side (parietal) bones. The rear (posterior) fontanelle lies between the two parietal bones and the single rear occipital bone. The fontanelles are covered by scalp and skin and allow moulding of the skull during birth. Both have usually closed by about 14 months. There are two other very small fontanelles on either side of the head.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
References in periodicals archive ?
Examination revealed open and flat anterior fontanelle, depressed neonatal reflexes and unremarkable systemic examination.
She quickly improved over the next couple of days with softening of the anterior fontanelles and improved feedings.
Caption: Figure 1: (a-i) CCD in an adolescent patient (B.Y.) accompanied by bilateral pseudoarthrosis of the clavicle, small face, protruding forehead, open anterior fontanelles, tooth eruption problems, short stature, and coxa vara.
CT head showed open anterior fontanelle, large cranial vault with thin diploic space, and no abnormality in the brain (Figure 2(c)).
Routine examination revealed the presence of a large fontanelle (or molera) in SHOW NEWS September 12 | Lothian K9 Clubs open show in Lanark Agricultural Centre at 9.30am.
This is related to the presence of fontanelles between the costal and peripheral plates, probably present along the entire ontogeny.
[3] Accessory maxillary sinus ostium is either congenital or secondary due to disease process as a result of obstruction of principle ostium by maxillary sinusitis or due to anatomical or pathological factors in the middle meatus resulting in the rupture of membranous area known as fontanelle. [4]
[7,11] Although it has been established that small for-gestational-age neonates have larger fontanelles because of delay in osseous maturation of the skull bones, as do neonates with skeletal morphogenesis,'4,111 none of the studies cited above included such subjects.
(1), (2) Cleidocranial dysostosis presents similarly to pycnodysostosis, with persistent open fontanelles and cranial sutures; however, it always involves the clavicle (a bone only rarely affected in pycnodysostosis) (1) and does not result in overall increased bone density.
Babies: You can tell if a baby is dehydrated by checking the fontanelles (soft spot) on their head.
"Congenital hypothyroidism is associated with delayed closure of the fontanelles. In addition, thyroid hormone is known to play a key role in normal bone metabolism, acting on both osteoblasts and osteoclasts.