Intercommissural Distance Mouth Width

Definition Mouth width at rest.

Landmarks Measure from one cheilion (corner of the mouth) to the other cheilion (Fig. 7.78).

Instruments Spreading calipers are best. A tape-measure held straight or a calibrated transparent ruler may be substituted.

Position The head should be held erect (in the resting position) with the eyes facing forward and the mouth held close and in a neutral position.

Alternative The young infant or child may lie supine.

Remarks The intercommissural distance has been estimated by several authors in spite of the intrinsic difficulties in measuring soft tissue points (Figs. 7.79 and 7.80).

Pitfalls The mouth should be at rest, as grimacing, crying, smiling, or any other facial expression will distort the measurement.

Intercommissural Distance

Figure 7.78 Measuring mouth width. Adapted from Garn et al. (1984).

Head Circumference Measurements

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 Gestational age (weeks)

Figure 7.79 Intercommissural distance, both sexes, at birth. From Merlob et al. (1984), by permission.

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 Gestational age (weeks)

Figure 7.79 Intercommissural distance, both sexes, at birth. From Merlob et al. (1984), by permission.

Figure 7.80 Intercommissural distance, both sexes, birth to 16 years. From Feingold and Bossert (1974) and Farkas (1981), by permission.

Figure 7.80 Intercommissural distance, both sexes, birth to 16 years. From Feingold and Bossert (1974) and Farkas (1981), by permission.

Human Head Circumference
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