2. LIE
PRESENTATION
PRESENTING PARTS
ATTITUDE
DENOMINATOR
POSITION
CEPHALIC PROMINENCE
3. LIE
The relationship b/w the long axis
of fetal ovoid to the long axis of
uterine ovoid
LONGITUDINAL LIE
TRANSVERSE LIE
OBLIQUE LIE
4.
5. PRESENTATION
That part of the fetus that lies over
the pelvic inlet & occupies the lower
poles of the uterus
3 presentation
CEPHALIC
PODALIC/BREECH
SHOULDER
6.
7. PRESENTING PARTS
The most dependant part of the fetus,
which is felt first on vaginal
examination
In cephalic presentation depending upon
degree of flexion,
vertex
brow
face
deflexed head
8. In breech presentation
Flexed breech (fetal legs may be
flexed)
Extended breech (extended at
knees)
Footling breech (completely
extended)
9.
10. ATTITUDE
The relation of fetal parts to each
other
Main attitudes
FLEXION
EXTENSION
11. TYPICAL FETAL
ATTITUDE
universal flexion
with head flexed
over chest, arms
& legs flexed in
front of the body
and back curved
forward
12. Anteroposterior diameters of
the fetal skull
AP diameter Attitude Presenting part
Suboccipitobregmatic 9.4 Complete flexion Vertex occipitoanterior
cm
Suboccipitofrontal 10.5 Incomplete flexion Vertex
cm occipitoposterior
Occipitofrontal 11 cm Deflexion Vertex
occipitoposterior
Verticomental 13.5 cm Extension Brow
Submentobregmatic 9.4 Complete extension face
cm
13.
14. DENOMINATOR
An arbitrarily chosen point on the
presenting part of the fetus which
is used to describe the position.
15. Presentations of the fetus
Presentation Attitude Denominator
Cephalic
vertex occipitoanterior Flexion Occiput
vertex occipitoposterior Deflexion occiput
brow Extension brow
face Complete extension Chin or mentum
Podalic or breech sacrum
shoulder acromion
16. Frequency of lie and
presenting part
Lie Presentation and
presenting part
Longitudinal 99.5% Vertex 96%
Transverse or oblique 0.5% Face 0.5%
Brow 0.5%
Breech 3%
Shoulder 0.5%
17. POSITION
The relationship
of the
denominator to
the four
quardrants of the
maternal pelvis.
18. In vertex presentation
Left occipitoanterior(common)
Left occipitotransverse
Left occipitoposterior
Right occipitoanterior
Right occipitotransverse
Right occipitoposterior
25. CEPHALIC PROMINENCE
The most prominent part of the
head palpable per abdomen
Produced by flexion and
extension of the head
Vertex presentation (head well
flexed)
occiput is lower than sinciput
(can be felt on the side opposite
to the back)
26. When the presenting part is face
or brow (extension of head)
sinciput is lower than
occiput (can be felt on the same
side of the back)
Cephalic prominence can be
palpated by the second pelvic
grip
27. When no cephalic prominence is
felt, there is neither flexion nor
extension and the attitude is one
of deflexion . This is also called
military position
28. Longitudinal lie commoner –fetus
being an ovoid accommodates itself
easily along the long axis of the
uterine ovoid
Cephalic presentation commoner -the
head being heavier and more
compact , due to gravitation, comes to
occupy lower pole and bulkier breech
adapts to the fundus of uterus ,which
is roomier
29. MOULDING
Cranial bones are connected by
membrane and this allows
considerable shifting or sliding of each
bone to accommodate to the maternal
pelvis.
Frontal and occipital bone pass under
parietal bone.
Posterior parietal is subject to more
pressure by the sacral promontory , it
passes under anterior parietal.
30. MOULDING (conti…..)
Thus there is compression of the
presenting diameter with compensatory
bulging of the diameter at right angles
Eg: in occipitoanterior head is
compressed in the presenting
suboccipitobregmatic and elongated in
the verticomental diameter .
31. Moulding is assessed on vaginal
examination at two sites
parietal-parietal
parietal-occipital
• disappears a few hrs after birth
• Protective mechanism & prevents the
fetal brain from compression as long
as it is not excessive or not rapid
33. Clinical significance
Some amount of moulding is beneficial
and this is one of the factors which
decide the success of a trial of labour
Severe moulding can lead to
intracranial haemorrhage
The site of moulding gives information
about the position of the head