title: [Macroscopic study and structure of the nerve of the levator muscle of the anus].
abstract: Beginning at the sacral plexus the nerve disposition can be found to follow two modalities: first disposition in 2/3 of all cases having a cranial nerve branch for the elevator portion and a caudal nerve branch for the sphincter portion; second disposition in 1/3 of all cases having a branch divided in its terminal part into 2 ramus branches, one for the elevator portion and one for the sphincter portion. On the average the nerve contains 539 fibers of which 73% are myelinated and 27% non myelinated. The fibrillar content is identical for both branches of either disposition.
mesh_terms: D001003:Anal Canal / Q000196:embryology / Q000294:innervation*; D005333:Fetus; D006801:Humans; D008160:Lumbosacral Plexus / Q000033:anatomy & histology; D008875:Middle Aged; D009132:Muscles / Q000294:innervation; D009412:Nerve Fibers / Q000648:ultrastructure; D009413:Nerve Fibers, Myelinated / Q000648:ultrastructure; D009454:Neurofibrils / Q000648:ultrastructure
vernacular_title: Etude macroscopique et structure du nerf du releveur de l'anus.