Anatomy of the Female Bony Pelvis
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Questions and Answers

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.

False (B)

Which of the following is the typical female pelvis?

  • Anthropoid pelvis
  • Android pelvis
  • Gynaecoid pelvis (correct)
  • Platypelloid pelvis

What is the obstetric conjugate?

<p>The shortest distance between the sacral promontory and the symphysis pubis.</p> Signup and view all the answers

Which diameter of the pelvic inlet is the widest?

<p>Transverse diameter (B)</p> Signup and view all the answers

The pelvic outlet is shaped like a heart.

<p>False (B)</p> Signup and view all the answers

What is the narrowest diameter of the pelvic outlet?

<p>The bispinous diameter.</p> Signup and view all the answers

Which statement is TRUE about the female bony pelvis?

<p>It is structurally adapted for childbirth and delivery. (D)</p> Signup and view all the answers

The female pelvis is structurally adapted for ______ and delivery.

<p>childbearing</p> Signup and view all the answers

Flashcards

Gynaecoid Pelvis

The typical female pelvic shape, ideal for childbirth.

Anthropoid Pelvis

An ape-like pelvis, not typical in humans, less ideal for childbirth.

Platypelloid Pelvis

A flat, wide pelvis, not as common, resembles some animal pelvises.

Android Pelvis

A male-like pelvis, not ideal for childbirth.

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False Pelvis

The upper, wider part of the pelvis, not directly involved in childbirth.

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True Pelvis

The lower, narrower part of the pelvis, involved in childbirth.

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Pelvic Inlet

The opening at the top of the true pelvis, marking the transition from the false pelvis.

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Pelvic Cavity

The space within the true pelvis where a baby passes through during labor.

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Pelvic Outlet

The exit of the true pelvis, marking the end of the baby's journey.

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Antero-posterior Diameter of Pelvic Inlet

The distance from the tip of the sacral promontory to the upper border of the symphysis pubis.

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Transverse Diameter of Pelvic Inlet

The distance between the farthest two points on the iliopectineal lines, usually the widest part of the pelvic inlet.

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Oblique Diameter of Pelvic Inlet

The distance from the sacroiliac joint on both sides to the opposite iliopectineal eminence, an angled measurement.

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Anatomical Antero-posterior Diameter of Pelvic Cavity

The distance from the tip of the coccyx to the lower border of the symphysis pubis, a measurement within the pelvic cavity.

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Obstetrical Antero-posterior Diameter of Pelvic Cavity

The distance from the tip of the coccyx to the most prominent point of the back of the symphysis pubis, the most important diameter for childbirth.

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Anatomical Transverse Diameter of Pelvic Cavity

The distance between the two ischial tuberosities, a measurement within the pelvic cavity.

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Obstetrical Transverse Diameter of Pelvic Cavity

The distance between the two ischial spines, the narrowest diameter of the pelvic cavity, critical for successful delivery.

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Innominate Bone

A hip bone, composed of three fused parts: ilium, ischium, and pubis.

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Ilium

The upper, flared part of the innominate bone.

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Ischium

The lower, posterior part of the innominate bone, forming part of the pelvic outlet.

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Pubis

The anterior part of the innominate bone, forming part of the pubic symphysis.

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Pubic Symphysis

The joint where the two pubic bones meet at the front of the pelvis.

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Female Bony Pelvis

The bony structure that supports the abdomen and protects internal organs, composed of four bones.

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Bi-tuberous Diameter

The distance between the two points on the ischial tuberosities.

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Bi-spinous Diameter

The distance between the two ischial spines.

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Obstetrical Conjugate

The measurement between the tip of the sacral promontory and the most prominent point of the back of the symphysis pubis.

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Gynandroid Pelvis

A pelvis with a wider pelvic inlet compared to the pelvic outlet, providing more room for the baby.

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Anthropoid Pelvis

A type of pelvic shape where the pelvic inlet is wider than the pelvic outlet, providing more room for the baby.

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Android Pelvis

A type of pelvis where the pelvic inlet is narrower than the pelvic outlet, providing less room for the baby.

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Platypelloid Pelvis

A type of pelvis where the pelvic inlet is flat and wide, providing more room for the baby.

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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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Anatomy of Female Bony Pelvis PDF

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.

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