Twisted orientation of the muscle bundles in the levator ani functional parts in women: Implications for pelvic floor support mechanism
Year: 2023
Type: article
Abstract: This study presents a comprehensive investigation of the anatomical features of the levator ani muscle. The levator ani is a critical component of the pelvic floor; however, its intricate anatomy and functionality are poorly understood. Understanding the precise anatomy of the levator ani is crucial for the accurate diagnosis and effective treatment of pelvic floor disorders. Previous studies have been limited by the lack of comprehensive three-dimensional analyses; to overcome this limitation, we analysed the levator ani muscle using a novel 3D digitised muscle-mapping approach based on layer-by-layer dissection. From this examination, we determined that the levator ani consists of overlapping muscle bundles with varying orientations, particularly in the anteroinferior portion. Our findings revealed distinct muscle bundles directly attached to the rectum (LA-re) and twisted muscle slings surrounding the anterior (LA-a) and posterior (LA-p) aspects of the rectum, which are considered functional parts of the levator ani. These results suggest that these specific muscle bundles of the levator ani are primarily responsible for functional performance. The levator ani plays a crucial role in rectal elevation, lifting the centre of the perineum and narrowing the levator hiatus. The comprehensive anatomical information provided by our study will enhance diagnosis accuracy and facilitate the development of targeted treatment strategies for pelvic floor disorders in clinical practice.
Source: Journal of Anatomy
DOI: 10.1111/joa.13968
Authors: Satoru Muro, Shoko Moue, Keiichi Akita
Institution: Tokyo Medical and Dental University
Language: English
Subfield: Urology
Field: Medicine
Domain: Health Sciences
Open Access status: hybrid
Estimated APC paid: $3,600
Awards: Elucidation of the role of the urorectal septum in the pelvic floor development, Anatomical analysis of the region anterior to rectum focusing on the diverse patterns of smooth muscle fiber arrangement, Elucidation of human body function using upright CT ~Looking at the era of healthy longevity~, Coexistence of Dense and Sparse Areas in the Longitudinal Smooth Muscle of the Anal Canal: Anatomical and Histological Analyses Inspired by Magnetic Resonance Images
OpenAlex ID: W4387966834