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Foetal head (Presenting part
pres part (Suboccipitophregmatic
Well…
Foetal head
Presenting part
-
-
Suboccipitofrontal
Partially flexed vertex (midfrontal bone to inferior occipital)
Second smallest (10.5cm)
-
-
-
-
Sutures
-
-
Fontanelles
Posterior (lambda) - 3 bones
Anterior (bregma) - 4 bones
Moulding
during labour
Caput succedaneum
Dilating cervix presses on scalp, preventing venous
and lymphatic drainage causing tissue swelling
Soft, boggy, dissapears <24h
Bone moulding
Overlapping of bones can reduce head circumference
(up to 4cm) and change its shape to allow passage
Physiological and dissapears after birth
Bones can override or slip under each other
VE assessment
None - sutures separate
1+ - suture lines meet
2+ - bones overlap, reducible
3+ - bones overlap, irreducible