Favourable female provis for normal delivery
A. Android
B. Gynecoid
C. Anthropoid
D. Platepelloid
Correct Answer: B. Gynecoid
Explanation
You asked about the favourable female pelvis for normal delivery. Let’s break it down carefully.
In obstetrics, the shape and dimensions of the female pelvis are crucial because the baby must pass through the birth canal during delivery. Not all pelvis shapes are equally favorable for vaginal delivery.
1. Favourable Pelvis Type
The pelvis that is most favorable for normal vaginal delivery is the Gynecoid pelvis.
Characteristics of Gynecoid Pelvis
- Shape of Pelvic Inlet:
- Rounded or slightly oval.
- Broad transverse diameter.
- Pelvic Cavity:
- Spacious and cylindrical.
- Promotes easy descent of the fetal head.
- Pelvic Outlet:
- Wide, roomy, and well-formed.
- Sacrum is short and curved posteriorly, leaving enough space.
- Ischial Spines:
- Not prominent, so less obstruction for fetal passage.
- Sacrosciatic Notch:
- Wide.
Why it’s favorable:
- The baby can align properly with the birth canal.
- Reduced risk of obstructed labor.
- Less intervention (forceps, C-section) usually required.
2. Other Pelvis Types (Less Favorable)
- Android pelvis – heart-shaped inlet, narrow; may cause obstructed labor.
- Anthropoid pelvis – oval, longer AP diameter; generally favorable, but some risk of occiput posterior presentation.
- Platypelloid pelvis – flat, transverse oval; least favorable, may delay labor.
✅ Summary:
- Favorable pelvis for normal delivery: Gynecoid
- Key features: Round inlet, wide outlet, spacious cavity.
Other Options Details
Here’s a detailed description of the four main types of female pelvis:
A. Android Pelvis
- Shape: Heart-shaped or triangular pelvic inlet.
- Characteristics:
- Narrower pelvic cavity.
- Prominent ischial spines.
- Sacrum is usually longer and more curved.
- Obstetric Significance:
- Less favorable for vaginal delivery.
- Higher chance of cephalopelvic disproportion.
B. Gynecoid Pelvis
- Shape: Round or slightly oval pelvic inlet.
- Characteristics:
- Wide transverse diameter.
- Spacious sacral curve.
- Round pelvic cavity.
- Obstetric Significance:
- Most favorable type for vaginal delivery.
- Accounts for about 50% of female pelvises.
C. Anthropoid Pelvis
- Shape: Oval but elongated anteroposteriorly (front to back).
- Characteristics:
- Narrow transverse diameter.
- Deep pelvic cavity.
- Sacrum straight and long.
- Obstetric Significance:
- Vaginal delivery is usually possible.
- Baby often presents in the occipito-posterior position.
D. Platypelloid Pelvis (also called Flat Pelvis)
- Shape: Oval but flattened transversely (side to side).
- Characteristics:
- Wide transverse diameter, short anteroposterior diameter.
- Shallow and flat pelvic cavity.
- Obstetric Significance:
- Vaginal delivery may be difficult.
- Associated with transverse lie of the fetus.
✅ Summary:
- Most favorable for birth: Gynecoid
- Least favorable: Android and Platypelloid
I hope that you liked this article.
Thanks!! 🙏 😊
Writer: Vandita Singh, Lucknow (GS India Nursing Group