In the pelvic inlet, which is the shoest anteroposterior diameter?
(A) True conjugate (B) Obstetric conjugate (C) Anatomical conjugate (D) Bispinous diameter
(B) Ans: B. Obstetric conjugate In pelvic inlet shoest anteroposterior diameter - Ostetric conjugate (10 cm).Pelvic inlet:Four diameters:Anteroposterior, transverse & two oblique diameters.Anteroposterior diameter:Distinct with specific landmarks.Most cephalad - Hence, true conjugate.Extends from upper- most margin ofthe symphysis pubis to sacral promontory.Clinically impoant obstetrical conjugate is shoest distance between the sacral promontory and the symphysis pubis. Normally 10 cm or more.