title: Feasibility of neurovascular antropylorus perineal transposition with pudendal nerve anastomosis following anorectal excision: a cadaveric study for neoanal reconstruction.
abstract: OBJECTIVE
  Perineal transposition of the antropyloric valve following an anorectal excision as a substitute for a permanent colostomy has recently been reported in humans. However, the problem of neural control still remains in these patients. Our aim herein was to study the anatomical feasibility of an anastomosis between the pudendal nerve branches (inferior rectal nerve) innervating the external anal sphincter and the anterior vagal branches of the perineally-transposed antropyloric segment in cadavers.
  
  
  METHODS
  The antropyloric segment, along with its carefully dissected branch of the anterior vagus, was mobilized based on the left gastroepiploic pedicle in six fresh human cadavers. The antropyloric valve was then transposed in the perineum after the pudendal nerve branches had been dissected out, and an approximation of these two nerves was performed to ascertain the technical feasibility of their neural anastomosis.
  
  
  RESULTS
  The anterior vagus innervating the antropylorus could be harvested in all cadavers below the hepatic division of the main vagus trunk. The inferior rectal nerve or its branches were found consistently around the 3 or the 9 o'clock position in the ischioanal fossa. An anatomical tension-free approximation of the anterior vagus branch (of the transposed antropyloric segment) to the inferior rectal nerve in the perineum was feasible in all the cadavers studied.
  
  
  CONCLUSIONS
  An inferior rectal nerve anastomosis with the anterior vagal branch of the perineally-transposed antropyloric segment can be achieved anatomically. This preliminary step can be the basis for future animal studies and subsequent clinical application of the procedure for possible neural control of the transposed antropyloric segment in the perineum.
authors.affiliation: Department of Surgical Gastroenterology, Chhatrapati Shahuji Maharaj Medical University (King George's Medical University), Lucknow, India.
authors.forename: Abhijit
authors.initials: A
authors.lastname: Chandra
authors.forename: Ashok
authors.initials: A
authors.lastname: Kumar
authors.forename: M
authors.initials: M
authors.lastname: Noushif
authors.forename: Nitish
authors.initials: N
authors.lastname: Gupta
authors.forename: Vijay
authors.initials: V
authors.lastname: Kumar
authors.forename: Navneet Kumar
authors.initials: NK
authors.lastname: Chauhan
authors.forename: Vishal
authors.initials: V
authors.lastname: Gupta
keywords: Anal sphincter; Colostomy; Pudendal nerve; Pylorus; Vagus nerve