PROFESSOR brito.v4@gmail.com

1. FETAL SKULL

2. INTRODUCTION
Fetal skull is to some extent compressible,
and made mainly of thin pliable tabular
(flat) bones forming the vault.

3. AREAS OF THE SKULL
It is divided into several zones of
obstetrical importance, these are,
• Vertex
• Brow
• Face

4. • FRONTAL BONE
• PARIETAL BONE
• TEMPORAL BONE
• OCCIPITAL BONE

5. VERTEX
• It is a quadrangular area bounded
Anteriorly -by bregma and coronal
sutures, Posteriorly -lamda and
lambdoid sutures. Laterally – by lines
passing through the parietal
eminences.

6. • it is an area bounded on one side
by the anterior fontenelle or
bregma and coronal sutures and
the other side by the root of the
nose and supra orbital ridges of
either side.
BROW

7. FACE
It is an area bounded on one side by
the root of the nose and supra –
orbital ridges and on other side by
the junction of the floor of the
mouth with neck.

8. SUTURES
• Flat bones of the vault are united
together by non- ossified membranes
attached to the margins of the bones.
These are called sutures.

9. TYPES
4types:
1. The coronal suture: runs between parietal
and frontal bone on either side.
2. The frontal suture: it lies between two
frontal bones
3. The lambdoid suture: it represents the
occipital bone and the two parietal bones.
4. The saggital suture or longitudinal suture:
it lies between two parietal bones.

10. FONTENELLE
• A wide gap in the suture line is called
fontenelle.
Types: 2types
• Anterior fontenelle(bregma)-diamond in
shape, diametre-4cm, time of ossification-
18months.
• Posterior fontenelle- triangular in shape,
diametre- 1.2cm, time of ossification- 1 half
months.

11. DIAMETERS OF SKULL
• 1. sub-occipito bregmatic: (9.5cm)
It extends from the nape of the neck to the centre of
the bregma.
2. sub-occipito frontal : (10cm)
It extends from the nape of the neck to the anterior
end of the anterior fontenelle or centre of sinciput.
3. Occipito – frontal : (11.5cm)
It extends from the occipital eminences to the root of
the nose.(glabella)

13. • 4. Mento- vertical : (13.5cm)
It extends from the mid point of the chin to
the highest point on the saggital suture.
5. sub- mento vertical: (11.5cm)
It extends from the junction of floor of the
mouth and neck to the highest point on the
saggital suture.
6. sub- mento bregmatic: (9.5cm)
It extends from junction of floor of the mouth
and neck of the bregma.

14. TRANSVERSE DIAMETER
• 1.bi-parietal diametre – (9.5cm)
• 2.super sub parietal- (8.5cm)
• 3.bi-temporal diametre- (8cm)
• 4.bi-mastoid diametre- (7.5cm)

15. THANK
YOU