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en.wikipedia.org/wiki/Fontanelle

A fontanelle (or fontanel) (colloquially, soft spot) is an anatomical feature of the infant human skull comprising any of the soft membranous gaps between the cranial bones that make up the calvaria of a fetus or an infant. Fontanelles allow for rapid stretching and deformation of the neurocranium as the brain expands faster than the surrounding bone can grow.

medlineplus.gov/ency/article/003310.htm

The skull is made up of many bones, 8 in the skull itself and 14 in the face area. They join together to form a solid, bony cavity that protects and supports the brain. The areas where the bones join together are called the sutures. The bones are not joined together firmly at birth. This allows the ...

medical-dictionary.thefreedictionary.com/fontanelle

fontanelle [fon″tah-nel´] one of the membrane-covered spaces remaining at the junction of the sutures in the incompletely ossified skull of the fetus or infant. Actually there are two soft spots close together, representing gaps in the bone structure which will be filled in by bone during the normal process of growth. The anterior fontanelle is ...

medical-dictionary.thefreedictionary.com/fontanels

One of several membranous intervals between the angles and margins of the cranial bones in the infant; they include the midline anterior and posterior fontanelles, and the paired sphenoidal and mastoid fontanelles.

www.merriam-webster.com/dictionary/fontanel

Fontanel definition is - a membrane-covered opening in bone or between bones; specifically : any of the spaces closed by membranous structures between the uncompleted angles of the parietal bones and the neighboring bones of a fetal or young skull.

carta.anthropogeny.org/moca/topics/age-fontanelles-cranial...

Fontanelles are membranous areas that have not yet ossified in the developing cranial vault of neonatal and juvenile animals. Fontanelles allow for rapid stretching and deformation of the cranium as the brain expands faster than the surrounding bone can grow.

www.aafp.org/afp/2003/0615/p2547.html

The diagnosis of an abnormal fontanel requires an understanding of the wide variation of normal. At birth, an infant has six fontanels. The anterior fontanel is the largest and most important for ...

www.chw.org/.../anatomy-of-the-newborn-skull

Anatomy of the newborn skull. Although the skull appears to be one large bone, there are actually several major bones that are connected together.

www.healthline.com/health/sunken-fontanelle

If dehydration is the confirmed cause of a sunken fontanel, your baby will either receive fluids by mouth if they aren’t vomiting and are alert or through an intravenous (IV) line inserted into ...

www.thefreedictionary.com/fontanels

fon·ta·nel also fon·ta·nelle (fŏn′tə-nĕl′) n. Any of the soft membranous gaps between the incompletely formed cranial bones of a fetus or an infant. Also called soft spot. [Middle English fontinel, from Old French fontanele, diminutive of fontaine, fountain; see fountain.] fontanelle (ˌfɒntəˈnɛl) or fontanel n (Anatomy) anatomy any of ...