The ppt covers basic about human female pelvis -- the passage to birth. Will work for undergraduates only.

1. The Passage –
Maternal Pelvis
Vedant Murkey
Batch 2010

2. The Journey through the Passage..!!!
• What is PASSAGE (pelvis) composed of..???
• What is true and false pelvis..??
• Inlet
• Cavity
• Outlet
Boundaries
Shape
Plane
Axis
Diameters

5. True Pelvis
Inlet Cavity Outlet
Obstetrical Anatomical

6. The Inlet…!!
• Boundaries --- The Brim
• Shape ---

7. Inlet…!! (contd…)
• Plane

8. Angle of inclination of pelvic inlet : It is the angle made by plane of the inlet with the
horizontal and is normally 55 degrees.
Clinical significance : (In diagram)

9. • Axis --- Downwards and backwards
• Diameters ---

10. Cavity – THE PLANE OF GREATEST
PELVIC DIMENSIONS
• Boundaries ---
anteriorly by the posterior
midpoint of pubic symphysis
posteriorly by the junction of S2-S3
laterally by the upper part of
obturator foramen
above by the brim
below by the obstetrical outlet
• Shape --- Rounded

11. • Plane of the greatest dimension (of pelvic
cavity)
S2
S3

12. • Axis --- Downwards
• Diameters --- later

13. Obstetrical Outlet..!!!
• Boundaries –
Anteriorly is deficient
Posteriorly by lower sacral
segment
Laterally by the Ischial bones
Above is Plane of the Least Pelvic
Dimension (also the plane of obstetrical outlet)
Below by the anatomical outlet

14. • Shape --- Vertically oval
• Plane --- plane of least pelvic dimensions.
Extends from lower border of Pubic
Symphysis Ischial Spines Tip of the
Sacrum.
Clinical Significance :
1. Internal rotation of head.
2. Marks the beginning of forward curve of the
pelvis.
3. Landmark used for pudendal block.

15. • Axis – Almost vertical formed by the line
joining the centre of the plane to sacral
promomtory.
• Diameters ---

16. Anatomical outlet…!!!
• Boundaries ---

17. • Shape --- Diamond shaped bcoz

18. • Plane ---
• Axis --- Downwards and forwards

19. Diameters of
Pelvis..!!!!

20. The Pelvic Inlet…!!!
1)True Conjugate (TC) – 11cm
2)Obstetric Conjugate (OC) – 10 cm
3)Diagonal Conjugate (DC) – 12 cm
Only Diagonal Conjugate can be measured
clinically by PV examination.
OC = DC – 2 cm
TC = DC – 1.2 cm

21. 4) Anatomical Transverse Diameter (13 cm)
5) Obstetric Transverse Diameter
ATD
OTD

22. 6) Oblique Diameter (12 cm)
7) Sacrotyloid Diameter (9.5 cm)
SI Joint
Iliopubic eminence

23. The Cavity..!!!
• Round cavity of greatest dimensions.
• Anteroposterior diameter
• Oblique diameter
• Transverse diameter
12 cm

24. Obstetrical Outlet..!!!
• Anteroposterior diameter – from midpoint of
sacral promontory to the junction of S2-S3.
(11cm)
• Transverse diameter – between two ischial
spines. (10.5 cm)

25. Anatomical Outlet..!!
• Anteroposterior diameter – from the lower
border of pubis symphysis ti the tip of coccyx.
(13 cm in 2nd stage of labor.)
• Transverse diameter – between two ischial
tuberosities. (11 cm)

26. To summarize..!!!
Diameters Inlet Cavity Outlet - anatomical
Anteroposterior 11 12 13
Oblique 12 12
Transverse 13 12 11

27. Pelvic Axes…!!!
• Anatomical Axis of Carus…
Curved axis formed by joining the axis of inlet,
cavity and outlet.

28. • Obstetrical Axis…
Goes downwards and backwards upto
level of ischial spine and abruptly turns
forwards.