FETUS-IN-UTERO (Lie, Presentation and Position)

LIE - 
The lie refers to the relationship of the long axis of the fetus
to the long axis of the centralized uterus or maternal spine.
The commonest lie being longitudinal (99.5%). 
The lie may be transverse or oblique.

PRESENTATION - 
The part of fetus which occupies the lower pole of the uterus is called
presentation of the fetus. The presentation may be -
     Cephalic - 96.5% ( Vertex- 96%, Face-0.5% )
      Podalic - 3%
     Shoulder and other - 0.5%
Presenting part -
The part of presentation which overlies the internal cervical os (opening).

DENOMINATOR -
It is an arbitrary bony fixed point on the presenting part which comes
in relation with the various quadrants of the maternal pelvis.
The following are the denominator of the different presentation -
- Occiput in vertex
- Mentum in face
- Frontal eminence in brow
- Sacrum in breech
- Acromion in shoulder

POSITION -
It is relation of the denominator to the different quadrants
of the pelvis. There are 8 positions with each presenting part.