The Fontanelles
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The Fontanelles

Osteology

General Anatomy

THE FONTANELLES

In the skull of the newborn, there are some gaps in the vault of the skull that are filled by membrane. These gaps are called FONTANELLES or FONTICULI. They are located in relation to the angles of the parietal bone as follows:Anterior and Posterior Fontanelle

The fontanelles disappear (by growth of the bones around them) at different ages after birth.


FONTANELLE: ANTERIOR (Bregma)

CHARACTERISTIC:

  • Diamond shape
  • Largest fontanelle
  • Lies between 2 parietal & 2 frontal bones

TIME OF CLOSURE:18-24 months


FONTANELLE: POSTERIOR (OCCIPITAL)

CHARACTERISTIC:

  • Triangular shape
  • Lies between 2 occipital & parietal bones

TIME OF CLOSURE: 2-3 months after birth





FONTANELLE: ANTEROLATERAL (Sphenoidal)

CHARACTERISTIC:

Present in relation to the antero-inferior angle of the parietal bone

TIME OF CLOSURE: 2-3 months


FONTANELLE: POSTEROLATERAL (Mastoid)

CHARACTERISTIC:

Present in relation to the postero-inferior angle of the parietal bone

TIME OF CLOSURE: 12-18 months


[NOTE: Anterior fontanelle is the last to close and has a high variation in the time of closure



Reference:

1.Textbook of HUMAN OSTEOLOGY (Inderbir Singh, 3rd Edition)



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