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Questions and Answers
Match the following female pelvic bones with their descriptions.
Match the following female pelvic bones with their descriptions.
Two innominate bones = Also known as the hip bones, composed of three parts: ilium, ischium, and pubis. Sacrum = A triangular bone formed from five fused vertebrae. Coccyx = The tailbone, composed of four fused vertebrae.
The true pelvis is located above the pelvic brim.
The true pelvis is located above the pelvic brim.
False
Which of the following is the typical female pelvis?
Which of the following is the typical female pelvis?
What is the obstetric conjugate?
What is the obstetric conjugate?
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Which diameter of the pelvic inlet is the widest?
Which diameter of the pelvic inlet is the widest?
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The pelvic outlet is shaped like a heart.
The pelvic outlet is shaped like a heart.
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What is the narrowest diameter of the pelvic outlet?
What is the narrowest diameter of the pelvic outlet?
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Which statement is TRUE about the female bony pelvis?
Which statement is TRUE about the female bony pelvis?
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The female pelvis is structurally adapted for ______ and delivery.
The female pelvis is structurally adapted for ______ and delivery.
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Study Notes
Anatomy of the Female Bony Pelvis
- The female pelvis is structurally adapted for childbirth and delivery.
- The female pelvis is composed of two innominate bones (hip bones), the sacrum, and the coccyx.
- Each innominate bone is composed of three parts: ilium, ischium, and pubis.
- The types of female pelvis are gynaecoid (50%), anthropoid (25%), platypelloid (5%), and android (20%). Gynaecoid is the typical female pelvis.
- The sub-pubic angle measures 90-100 degrees in gynaecoid pelvis, this helps to differentiate the types.
- The pelvis is anatomically divided into two parts, true and false.
- The true pelvis lies below the pelvic brim.
- The false pelvis lies above the pelvic brim and does not have obstetric significance.
- The pelvic inlet (pelvic brim) is a slightly transverse oval shape.
- The boundaries of the pelvic inlet are the sacral promontory, sacroiliac joint, ilio-pectineal line, ilio-pectineal eminences, and the upper border of the symphasis pubis.
Diameters of the Pelvic Inlet
- A-True Conjugate (anatomical diameter; 11cm): extends from the sacral promontory to the upper rim of the symphysis pubis.
- B-Obstetric Conjugate (obstetrical diameter; 10.5cm): extends from the sacral promontory to the most prominent part of the back of the symphysis pubis.
- C-Diagonal Conjugate (12.5cm): extends from the lower border of the symphysis pubis to the tip of the sacral promontory
Diameters of the Pelvic Cavity
- 2-Transverse Diameter (13cm): extends between the furthest points on the ilio-pectineal lines. It is the widest diameter of the pelvic inlet.
- 3-Oblique Diameters (12cm): extends from the sacroiliac joint to the opposite ilio-pectineal eminence.
Diameters of the Pelvic Outlet
- 1-Antero-Posterior Diameter (anatomical; 11cm): extends from the tip of the coccyx to the lower border of the symphysis pubis.
- Obstetrical Antero-Posterior Diameter (13cm): extends from the sacrococcygeal joint to the lower border of the symphysis pubis.
- 2-Transverse Diameter (anatomical; 11cm): extends between the ischial tuberosities.
- Obstetrical Transverse Diameter (10cm): extends between the ischial spines (narrowest diameter).
Pelvic Inlet and Outlet Boundaries
- Pelvic Inlet Boundaries: Sacral Promontory, Sacroiliac Joint, Ilio-pectineal Line, Ilio-pectineal Eminences, Upper Border of Symphysis Pubis
- Pelvic Outlet Boundaries: Lower Border of Symphysis Pubis, Ischial Tuberosities, Ischial Spines, Tip of Coccyx
Pelvic Cavity
- Shape: Circular
- Diameters: Equal in antero-posterior, oblique and transverse (12cm)
Types of Pelvis
- Gynaecoid: Typical female pelvis
- Anthropoid: Ape-like
- Platypelloid: Flat, resembles cats and dogs
- Android: Male-like
Other Important Points
- The pelvic outlet is diamond shaped.
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Description
This quiz explores the structural adaptations of the female pelvis for childbirth, including its composition and different types. You will learn about the anatomical divisions, measurements, and significance of the pelvic inlet. Test your knowledge of female pelvic anatomy and its importance in obstetrics.
