Which pelvic diameter is narrowest at the pelvic outlet?
Which pelvic diameter is narrowest at the pelvic outlet?
11 cm wide
Which is the narrowest? The narrowest diameter for the fetus to pass through is the pelvic outlet, which is only 11 cm wide in the average female pelvis.
What is the meaning of Bispinous diameter?
Plane of Least Diameter (Midplane) The transverse (bispinous) diameter extends between the ischial spines. The posterior sagittal diameter extends from the midpoint of the bispinous diameter to the junction of the fourth and fifth sacral vertebrae.
What pelvic diameter is horizontal when the female stands erect?
When a woman stands erect, the pelvis is tilted forward. The pelvic inlet makes an angle of about 55 ° with the horizontal….Bony pelvis.
| Brim | Round or oval transversely |
|---|---|
| Cavity | Sacrospinous ligament at least 3.5 cm |
| Outlet | Pubic arch rounded |
| Subpubic angle > 80 ° | |
| Intertuberous diameter at least 10 cm |
What are the abnormal types of pelvis?
Female Pelvic Disorders
- Pelvic organ prolapse.
- Vesicovaginal fistula, urethrovaginal fistula, ureterovaginal fistula, rectovaginal fistula.
- Incontinence.
- Overactive bladder.
- Female sexual function.
- Urethral diverticulum.
What are the 4 types of the pelvis?
Although pelvises can be classified according to diameter, in obstetric practice they are often divided into 4 main types: gynecoid, android, anthropoid, and platypelloid, based mainly on the shape of the pelvic inlet [5].
What is the rarest type of pelvis?
The platypelloid pelvis is also called a flat pelvis. This is the least common type.
How do you measure Bispinous diameter?
The bispinous diameter (BSD) (white) is measured in the axial view through the ischial spines (c), and the transverse outlet diameter (TOD) (yellow) is measured with an axial view through the ischial tuberosities (d).
What is the interspinous diameter of the pelvis?
Interspinous diameter is the smallest diameter of the pelvis in the midplane The smallest anteroposterior diameter of the pelvic inlet is called the Obstetric conjugate Subpubic angle is 85° The distance from the upper end of sacrum to lower border of pubis corresponds to Diagonal conjugate Transverse diameter of the female mid-pelvic plane is 10.5
What is the diameter of the inlet and pelvic cavity?
Both the oblique diameters of inlet and pelvic cavity are 12 cm. AP diameter – 11, 12, 13 from up to down Transverse diameter: 13, 12, 11 from up to down AP diameter: Inlet (Anatomical conjugate) – 11 cm, Pelvic cavity – 12 cm and Outlet (Anatomical outlet) – 13 cm
What is the AP and AP diameter of the pelvic cavity?
Mnemonic –. Pelvic cavity is almost round with both AP and transverse diameter 12 cm. Both the oblique diameters of inlet and pelvic cavity are 12 cm. AP diameter – 11, 12, 13 from up to down. Transverse diameter: 13, 12, 11 from up to down.
What are the sidewalls of the midpelvis?
In the midpelvis, sidewalls of pelvis are straight and the spines are not prominent. At the outlet, pubic arch is wide. At the inlet, posterior sagittal diameter. At the inlet, AP diam.>Transverse diam. In the midpelvis, sidewalls are convergent, ischial spines are likely to be prominent.
