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Skull of new born

Fontanelles (fonticuli)-are remnants of the membranous stage: Anterior,Posterior, Sphenoid, Mastoid

-Sutures are not developed

-Air sinuses are not developed

-muscular tubercules are not developed

-The alveolar processes are not completely developed, mendibula consist of two parts

After the birth the growth of the skull passes through 3 priods:

1 - from birth to 7 years (is characterized by the intensive growth, mainly of the posterior part);

2-from 7 to 13-16 years (period of relative rest);

3 - from 13-1 6 to 20-23 years (intensive growth mainly, of the anterior part)

Some sexuall properties of the skull:

-The adult female's skull is:
a little lighter, smaller
its capacity is about 10% less
its walls are thinner and muscular ridges less marked
the glabella, superciliary
arches, mastoid processes
are less prominent
° air sinuses are smaller

SOME SEXUAL PROPERTIES OF THE
SKULL

° tympanic plates are smaller an

their margins less rough
° the upper orbital margins are

sharper

° the forehead is vertical

° the facial contour is rounder
° facial bones smoother

° the mandible 8 maxillae are

smaller

INDIVIDUAL PROPERTIES OF THE
SKULL

° Skulls are classified

according to the cephalic

(cranial) index as:

° short (brachycephalic)

° middle (mesocephalic)

° long (dolichocephalic)

The cephalic index is the ratio of the
breath to length in percents

The formula is: BIL x 100% = Cl up to 74.9 is the dolichocephalic - 75.0 to 79.9 is the mesocephalic - 90.0 to 84.9 is the brachycephalic

height to breadth of the facial skeleton
in percents

Three types of the visceral

cranium are distinguished:

° wide face (ar prazopfc type) - Fl

less than 85

° middle face (mesoprozopic

type) — FI of 85 -89.9

° narrow face (leptoprozopic type)

- FI above 90

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