Continence and micturition: an anatomical basis.

Area of Science:

• Urology
• Neuroanatomy
• Pelvic Floor Anatomy

Background:

• Urinary incontinence presents a significant global health challenge, impacting socio-economic, psychological, and medical aspects.
• Maintaining urinary continence and coordinating micturition involve complex interactions between somatic, visceral, and learned behavioral elements.
• Effective bladder function requires seamless communication between pelvic viscera, pelvic floor muscles, and higher neural centers.

Purpose of the Study:

• To delineate the anatomical structures and neuronal pathways critical for urinary continence and micturition.
• To provide a comprehensive anatomical basis for understanding urinary incontinence.
• To inform medical and surgical management strategies and guide future therapeutic development.

Main Methods:

• Literature review focusing on pelvic floor and urinary sphincter anatomy.
• Review of the neuroanatomy of urinary continence and micturition.
• Inclusion of data from live and cadaveric human studies.

Main Results:

• Bladder filling triggers urothelial mediators, activating afferent nerves and myofibroblasts, signaling bladder fullness.
• The internal urethral sphincter is continuous with the detrusor muscle, with variable arrangement.
• The external urethral sphincter integrates with levator ani muscle fibers, and pudendal nerve damage is common in females.

Conclusions:

• A thorough understanding of pelvic anatomy and neuroanatomy is vital for managing urinary incontinence.
• This knowledge aids in the appropriate medical and surgical treatment of patients.
• Comprehensive anatomical insight supports the development of novel therapies for urinary incontinence.