PELIVS WITH PICTURE EXPLATION

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THE pelvis is automatically divided into a false pelvis and true pelvis, the boundary line being the brim of the pelvis. The bony landmarks on the brim of he pelvis from anterior to posterior on each side are- upper border of symphysis pubis, pubic crest, public tubercle, pectineal line, iliopubic eminence, iliopectineal line, sacro iliac articulation, anterior border of the ala of sacrum and sacral promontory.

FALSE PELVIS

THE false pelvis id formed by the iliac portion of the innominate bones and is limited above by the iliac crests. it has got little obstetric significance except that its measurement cant o a certain extent, predict the size and configuration of the true pevis.it sonly obstetric function is to support the enlarged uterus during pregnancy. its boundaries are: posterior- lumbar vertebrae, laterally- iliac fossa and anteriorly- anterior abdominal wall.

TRUE PELVIS

THIS part of the pelvis is chiefly of concern to the obstetricians, as it forms the canal through which the fetus has to pass. it is shallow in front, formed by symphysis pubis and measures 4 cm and deep measures 11.5 cm. It is divided into inlet, cavity and outlet.

SHAPE OF PELVIS


INLET
INLET is the brim of pelvis, the circumference of the inlet is formed by the bony landmarks.
It is almost round (gynaecoid) with the antero-posterior diameter being the shortest. other different shapes of the inlet are anthropoid, android and platypelloid.



CAVITY
CAVITY is the segment of the pelvis bounded above by the inlet and below by plane of least pelvic dimensions.


OUTLET
OUTLET is the segment of the pelvis bounded above by the plane of least pelvic dimensions and below by the anatomical outlet. 


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