Pelvic Anatomy Quiz

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Questions and Answers

Which of the following is NOT a characteristic of the sacrum?

  • It has a sacral canal that continues the vertebral canal.
  • It consists of five fused vertebrae.
  • It is located inferior to the coccyx. (correct)
  • It has a prominent anterior edge called the promontory.

What is the significance of the sacral hiatus?

  • It serves as a pathway for nerves and tissues. (correct)
  • It provides passage for the spinal cord.
  • It is the site of an anatomical landmark for the coccyx.
  • It allows for the attachment of the gluteus maximus muscle.

What structures contribute to the formation of the lateral sacral crest?

  • Transverse processes of the vertebrae. (correct)
  • Costal processes of the vertebrae.
  • Spinous processes of the vertebrae.
  • Articular processes of the vertebrae.

Which of the following is TRUE regarding the coccyx?

<p>It has no weight-bearing function. (A)</p> Signup and view all the answers

What structure serves as a landmark for the sacral hiatus?

<p>Sacral horn. (C)</p> Signup and view all the answers

Which of these is NOT a structure attached to the coccyx?

<p>Iliococcygeal ligament. (D)</p> Signup and view all the answers

In comparison to males, the pelvic inlet in females is typically:

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

Which of the following structures primarily contributes to the difference in the pubic arch angle between males and females?

<p>Pubic bones. (C)</p> Signup and view all the answers

What is another name for the pelvic inlet?

<p>Superior pelvic aperture (B)</p> Signup and view all the answers

At what age does complete fusion of the hip bones typically occur?

<p>23 years old (D)</p> Signup and view all the answers

Which of the following components is part of the pelvic outlet boundaries?

<p>Pubic arch (C)</p> Signup and view all the answers

Which structure articulates with the head of the femur?

<p>Acetabulum (C)</p> Signup and view all the answers

What anatomical structure is located at the tip of the coccyx in relation to the pelvic outlet?

<p>Posterior boundary (C)</p> Signup and view all the answers

What shape is the sacrum described as?

<p>Triangular, wedge-shaped (C)</p> Signup and view all the answers

How many fused vertebrae make up the sacrum?

<p>5 fused vertebrae (B)</p> Signup and view all the answers

What is the function of the sacrum in relation to the body weight?

<p>Transmits body weight to the pelvic girdle (D)</p> Signup and view all the answers

What determines the normal lumbosacral angle in individuals?

<p>The angle between S1 and horizontal line (A)</p> Signup and view all the answers

At what age does fusion in the sacrum typically occur?

<p>20 years old (C)</p> Signup and view all the answers

Which structure does the superior articular process of the sacrum articulate with?

<p>L5 inferior articular process (C)</p> Signup and view all the answers

What feature is associated with the anterior surface of the sacrum?

<p>Concave and smooth surface (C)</p> Signup and view all the answers

Which part of the sacrum is described as the prominent anterior edge?

<p>Promontory (D)</p> Signup and view all the answers

What structure forms the pelvic brim?

<p>Sacral ala and promontory (D)</p> Signup and view all the answers

Which characteristic describes the female pelvic inlet?

<p>Oval and rounded (C)</p> Signup and view all the answers

What does the pelvis major contain?

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

Which characteristic is true of the male bony pelvis?

<p>Deep greater pelvis (D)</p> Signup and view all the answers

What forms the anterior border of the pelvis minor?

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

How is the pubic arch typically described for males?

<p>Narrow and acute (D)</p> Signup and view all the answers

What is the posterior border of the pelvic outlet?

<p>Inferior margin of the pelvic outlet (A)</p> Signup and view all the answers

What is a characteristic of the female pelvis compared to the male pelvis?

<p>Larger pelvic outlet (B)</p> Signup and view all the answers

What are the main components of the pubis?

<p>Body and 2 rami (D)</p> Signup and view all the answers

Which structure is formed by the conjoined inferior rami of the pubis and ischium?

<p>Pubic Arch (C)</p> Signup and view all the answers

What is the function of the ischial spine?

<p>Separates the greater and lesser sciatic notches (B)</p> Signup and view all the answers

Which bony prominence serves as an attachment site for the rectus femoris muscle?

<p>Anterior Inferior Iliac Spine (B)</p> Signup and view all the answers

Which part of the ilium is located at the junction of the superior and anterior margins?

<p>Anterior Superior Iliac Spine (C)</p> Signup and view all the answers

What feature of the ischium helps form the acetabulum?

<p>Ischial Tuberosity (C)</p> Signup and view all the answers

What is the characteristic feature of the pubic crest?

<p>It is a thickening of the anterior part of the body. (A)</p> Signup and view all the answers

Which notch is associated with the attachment site for the sacrotuberous ligament?

<p>Greater Sciatic Notch (D)</p> Signup and view all the answers

What is the inferior most part of the abdominal cavity known as?

<p>Pelvic Cavity (D)</p> Signup and view all the answers

Which structure forms the floor of the pelvis?

<p>Levator Ani (A)</p> Signup and view all the answers

Which of the following bones is NOT part of the pelvis?

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

What distinguishes male and female pelvic brim?

<p>Shape and size of the inlet (C)</p> Signup and view all the answers

Which ligament is part of the vertebropelvic ligaments?

<p>Sacrospinous Ligament (A)</p> Signup and view all the answers

What is the pubic symphysis?

<p>A joint between the pubic bones (A)</p> Signup and view all the answers

Which artery is found in the pelvis?

<p>Internal Iliac Artery (D)</p> Signup and view all the answers

Which muscle is NOT part of the pelvic diaphragm?

<p>Transversus Abdominis (A)</p> Signup and view all the answers

Flashcards

Pelvic Inlet

The superior pelvic aperture dividing the pelvis into greater and lesser parts.

Pelvic Outlet

The inferior pelvic aperture, bound by bones of the pelvis.

Ilium

The large upper part of the hip bone consisting of the body and iliac crest.

Acetabulum

Cup-shaped socket formed by the union of hip bones that articulates with the femur.

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Ischium

The lower and back part of the hip bone with body and muscle attachment points.

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Pelvic Cavity

The lowest part of the abdominal cavity located below the pelvic brim.

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Pelvic Floor Diaphragm

Muscular structure that supports pelvic organs and separates pelvis from perineum.

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Hip Bones

Composed of the ilium, ischium, and pubis; makes up pelvis structure.

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Sacrum

A triangular bone at the base of the spine, consisting of fused vertebrae.

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Pelvic Brim

The edge of the pelvic inlet; differentiates between pelvic major and minor.

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Pubic Symphysis

A cartilaginous joint where the left and right pubic bones meet at the front.

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Levator Ani

A key muscle in the pelvic diaphragm; assists in pelvic support.

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Ventral Surface

The front surface of the sacrum, which is smooth and concave.

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Lumbosacral Angle

The angle formed between the lumbar spine and the sacrum, varies between genders.

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Ala

The wings of the sacrum, formed by fused transverse processes.

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Posterior Surface

The back surface of the sacrum containing structures like sacral canal and transverse processes.

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Sacral Hiatus

An opening at the end of the sacral canal, allowing passage for nerves.

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Transverse Lines

Lines indicating fusion points on the anterior surface of the sacrum.

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Coccyx

The tailbone at the bottom of the vertebral column, consisting of 3-4 fused vertebrae.

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Pelvic Girdle

The structure formed by the hip bones, supporting the trunk and forming the pelvis.

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Pubis

A bone that forms part of the pelvis, consisting of body and two rami.

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Superior Ramus

Upper portion of the pubis, contributing to the obturator foramen.

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Greater Sciatic Notch

An indentation in the ischium that serves as an attachment site for ligaments.

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Anterior Superior Iliac Spine (ASIS)

Prominent bony projection at the front of the ilium, attachment site for ligaments.

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Pelvis Major

Also called the 'False Pelvis', it is superior to the pelvic brim and contains abdominal viscera.

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Pelvis Minor

Also known as the 'True Pelvis', found below the pelvic brim, containing pelvic viscera.

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Male Pelvic Inlet Shape

Heart-shaped and narrow.

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Female Pelvic Inlet Shape

Oval and rounded, allowing for childbirth.

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Subpubic Angle

Angle formed by the pubic bones; narrower in males (80 degrees) and wider in females.

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Bony Pelvis Differences

Males have thick, heavy pelvis while females have thin, light pelvis.

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Promontory (S1)

The prominent anterior edge of the sacrum that forms the lumbosacral angle.

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Sacral canal

A continuation of the vertebral canal within the sacrum, ending at the sacral hiatus, used for injections.

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Male vs. Female Pelvis

Males generally have a heart-shaped pelvic inlet, while females have a wider, oval-shaped inlet for childbirth.

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Coccygeal cornua

The rudimentary processes that form the broader, larger part of the coccyx, resembling horns.

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Study Notes

Pelvis and Pelvic Girdle

  • The pelvis is the inferior most part of the abdominal cavity, inferior to the pelvic brim
  • The pelvis lies inferior to the abdomen
  • The pelvis is divided into the greater (false) pelvis, and the lesser (true) pelvis.
  • The greater pelvis contains the viscera, e.g., ileum, sigmoid colon
  • The lesser pelvis (true) pelvis is inferior to the pelvic brim
  • The lesser pelvis contains the pelvic viscera, deep parts of perineum, specifically ischio-anal fossae.
  • The pelvic floor/diaphragm is formed by pelvic diaphragm
  • It separates the pelvis from the perineum

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