Male vs Female Pelvis Anatomy Quiz & Flashcards

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the characteristic of the sacrum in a platypelloid pelvis?

It is narrow

It is pushed forward (correct)

It is flat

It is curved

Which type of pelvis is more triangular in shape at the inlet?

Android pelvis (correct)

Platypelloid pelvis

Anthropoid pelvis

Gynecoid pelvis

What is the effect of the boney prominences in an android pelvis on fetal rotation and extension?

They only affect extension

They have no effect on rotation and extension

They facilitate rotation and extension

They block rotation and extension (correct)

Which type of pelvis favors transverse presentations?

Platypelloid pelvis Signup and view all the answers

What is the characteristic of the subpubic arch in an anthropoid pelvis?

It is slightly narrowed Signup and view all the answers

What shape is the pelvic inlet in a male pelvis?

Heart-shaped Signup and view all the answers

What is the shape of the pubic arch in a female pelvis?

More rounded and wider Signup and view all the answers

Which muscle forms part of the pelvic diaphragm?

Levatores ani Signup and view all the answers

What is the function of the pelvic floor?

Supports the pelvic viscera Signup and view all the answers

What is the characteristic of the sacrum in a female pelvis?

Shorter, wider, and flatter Signup and view all the answers

Which of the following is a characteristic of a male pelvis?

Pelvic outlet is smaller Signup and view all the answers

What is the shape of the sacrum bone?

Wedge shape Signup and view all the answers

What is the function of the pelvic diaphragm?

Divides the true pelvis into main pelvic cavity and perineum Signup and view all the answers

What is the name of the joint formed by the articulation of the sacrum and iliac bone?

Sacroiliac joint Signup and view all the answers

What is the characteristic of the gynecoid pelvis?

Oval at the inlet, with a generous capacity and wide subpubic arch Signup and view all the answers

What is the purpose of the obturator membrane?

To facilitate the passage of the obturator nerve Signup and view all the answers

What is the characteristic of the sacral canal?

It contains both the anterior and posterior roots of lumbar, sacral, and coccygeal spinal nerves Signup and view all the answers

Study Notes

Pelvic Types and Their Characteristics

Platypelloid Pelvis
- Comprises 2% of pelvis types.
- Flattened at the inlet with a prominent sacrum; sacral promontory is forward.
- Wide subpubic arch but prominent ischial spines.
- Predominantly favors transverse fetal presentations.
Anthropoid Pelvis
- Seen in 24% of white women and 41% of black women.
- Oval shape at the inlet, narrow with a long axis.
- Slight narrowing of the subpubic arch.
- Tends to favor occiput posterior fetal presentations.
Android Pelvis
- Found in 33% of white females and 16% of black females.
- Triangular shape at the inlet with a narrowed subpubic arch.
- Larger fetuses struggle due to blocked normal areas for rotation and extension; smaller ones may still pass through.
- Known as male or funnel-shaped pelvis; deeper compared to female pelvis.

Comparisons Between Male and Female Pelvis

Male Pelvis
- Pelvic inlet: heart-shaped; narrower than female.
- Pelvic cavity: deeper, narrower; pelvic outlet smaller.
- Pubic arch: narrower.
- Long and narrow structure.
Female Pelvis
- Pelvic inlet: oval, transversely wider.
- Pelvic cavity: roomier and shallower than male.
- Pelvic outlet: larger and more rounded.
- Pubic arch: wider and more rounded.
- Short and wide structure.

Anatomy of the Pelvis

Pelvic Floor
- Supports pelvic viscera, formed by the pelvic diaphragm and associated fascia.
- Divides the pelvic cavity from the perineum.
Pelvic Diaphragm
- Composed of levatores ani and coccygeous muscles.
- Incomplete anteriorly to allow passage of urinary and reproductive structures.

Sacrum and Coccyx

Sacrum
- Composed of five fused vertebrae forming a wedge-shaped bone.
- Articulates with the 5th lumbar vertebra at the upper border and fuses with the coccyx at the inferior border.
- Forms the sacroiliac joint with the iliac bone.
- Sacral promontory serves as an important obstetric landmark.
Coccyx
- Formed by four fused vertebrae, resulting in a small triangular bone.
- Articulates with the base of the sacrum.

Obstetric Considerations

Sacral Hiatus
- Formed when laminae of the 5th or sometimes 4th vertebra do not fuse.
- Houses the anterior and posterior roots of spinal nerves.
Obturator Foramen
- Formed by the hip bone and other ligaments; covered by obturator membrane for nerve passage.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your knowledge of the differences between the male and female pelvis in terms of shape, size, and structure. Learn about the pelvic inlet, outlet, and cavity, as well as the public arch and false pelvis. Get ready to distinguish between the male and female pelvis anatomy!