Anterior Fontanelle Size

Definition The sum of the longitudinal and transverse diameters of the anterior fontanelle along the sagittal and coronal sutures (Figs. 7.24-7.28).

Landmarks The index finger should be placed as far as possible into each of the four corners of the anterior fontanelle. These four positions may be marked with a dot immediately distal to the fingertip. The longitudinal and transverse diameters may be measured directly, or a piece of white paper can be firmly pressed over the fontanelle to transfer the marks (Fig. 7.25). The points are jointed to form a quadrilateral, and the sum of the longitudinal and transverse diameters along the sagittal and coronal sutures can be measured.

Instruments Spreading calipers, tape-measure, or rule may be used.

Position The head should be held erect with eyes looking straight forward. The examiner should look down on the skull vault from above.

Fig. 7.24 Closure of constant and accessory fontanelles and sutures

Closure Time

Fig. 7.24 Closure of constant and accessory fontanelles and sutures

Closure Time

Anterior fontanelle

1 year ± 4 months

Posterior fontanelle

Birth ± 2 months

Anterolateral fontanelle

By third month

Posterolateral fontanelle

During second year

Metopic suture

By third year (10%, never)

Clinical closure of sutures

6-12 months

Anatomic closure of sutures

By 30th year

Adapted from Goodman and Gorlin (1977).

Adapted from Goodman and Gorlin (1977).

How Measure Size Anterior FontanelAnterior FontanelleAnterior Fontanelle Size

6 9 12 15 18 Age from birth (months)

Figure 7.26 Anterior fontanelle size (sum of longitudinal and transverse diameters). From Popich and Smith (1972), by permission.

6 9 12 15 18 Age from birth (months)

Figure 7.26 Anterior fontanelle size (sum of longitudinal and transverse diameters). From Popich and Smith (1972), by permission.

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Responses

  • Damien
    How to measure anterior fontanelle?
    5 years ago
  • Jamila
    How to measure anterior fontanelle with fingers?
    5 years ago
  • tobias
    How to measure size of anterior fontanel?
    5 years ago
  • austin
    How to measure anterior fontanalle?
    4 years ago
  • alistair
    Where is the posterolateral fontanel?
    4 years ago
  • george
    How to measure fontanelle size?
    4 years ago
  • kelsi black
    How to measure anterior fontallae?
    3 years ago
  • Jonathan
    How to measure open anterior fontanelle?
    3 years ago
  • T
    How to measure transverse fontanel?
    3 years ago
  • chantelle
    How to measure size of anterior fontanelle?
    3 years ago
  • doreen gottlieb
    How a nurse can measure an anterior fontanelle?
    2 years ago
  • alexander
    How to measure anterior fontenol?
    2 years ago
  • Valtteri
    How many fingers is anterior fontanel?
    2 months ago

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