The Pelvic Diaphragm
The pelvic diaphragm is a funnel-shaped muscular structure that forms the floor of the pelvic cavity. It supports the pelvic viscera and helps maintain continence.
Key Components
| Muscle Group | Specific Muscles |
|---|---|
| Levator Ani | Puborectalis, Pubococcygeus, Iliococcygeus. |
| Coccygeus | Coccygeus (Ischiococcygeus). |
Functional Significance
- Puborectalis: Specifically creates the anorectal angle (perineal flexure), which is crucial for fecal continence.
- Support: Provides dynamic support to the bladder, uterus, and rectum.
- Intra-abdominal Pressure: Acts in concert with the thoracic diaphragm to manage intra-abdominal pressure.
High-Yield Exam Pearl:
Weakness or damage to the pelvic diaphragm (often via childbirth) can lead to pelvic organ prolapse (cystocele, rectocele, or uterine prolapse) and stress urinary incontinence. Kegel exercises target these muscles to improve tone and function.