What is the difference between the true and false pelvis?

The false (greater) pelvis lies above the pelvic brim and supports abdominal viscera. The true (lesser) pelvis lies below the brim and contains pelvic viscera, bounded inferiorly by the pelvic diaphragm and outlet.

Chapter 4 of 5 - Anatomy Course

Pelvis & Perineum

The bony pelvis transfers weight from the spine to the lower limbs and encloses pelvic viscera. The pelvic floor and perineum separate pelvic cavities from the exterior.

Obstetric and urologic stems assume you can trace fascial layers, sphincters, and neurovascular bundles without confusing midline versus lateral pathology.

Bony Pelvis and Sexual Dimorphism

The pelvic brim (inlet) separates false from true pelvis. The pelvic outlet is bounded by the pubic arch, ischial tuberosities, and coccyx. Female pelves classically show a wider subpubic angle and larger outlet dimensions relevant to childbirth.

Support from above and below

Abdominal pressure

Transfers through pelvic brim to hips.

Pelvic floor muscles

Levator ani, coccygeus support viscera.

Urogenital diaphragm

Deep perineal structures and sphincteric support.

External landmarks

Ischial spines for fetal station; clinical nerve blocks.

Comparison of male and female human pelvis shapes and inlet dimensions — Compare inlet shape, subpubic angle, and outlet dimensions; exam items link pelvic dimensions to obstetric risk and trauma patterns.
CFCF, Wikimedia Commons, CC BY-SA 4.0
Source

Molecular Structure

Testosterone

Androgen signaling shapes pelvic musculature and urogenital development; clinical anatomy overlaps with endocrine and reproductive medicine.

Formula

C₁₉H₂₈O₂

Mol. Weight

288.42 g/mol

View on PubChem

Perineal Triangles

The urogenital triangle contains external genital structures and urethral passages; the anal triangle contains the anal canal and ischiorectal fossae. Infections and abscesses can track along fascial planes between these regions.

Structure	Clinical note
Ischiorectal fossa	Common site of perianal abscess spread
Pubic symphysis	Midline landmark for suprapubic access
Sacral plexus origins	Sciatic nerve exits greater sciatic foramen

Quick Check

Which structure is the main voluntary urinary sphincter in typical male anatomy descriptions?

Fill in the Blank

The muscular floor that supports pelvic viscera and includes levator ani is called the pelvic________.

From pelvic pain to structure

Midline versus lateral

Uterine vs adnexal; prostate vs obturator internus.

Visceral referral patterns

Ureter to groin; bladder neck to perineum.

Neurovascular corridor

Lumbosacral plexus branches to lower limb and perineum.

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