Morphology and Innervation of Anal Sphincter Muscle Complex
- VernacularTitle:肛门括约肌复合体的形态及神经支配
- Author:
Dongming ZHANG
;
Qingyou MENG
- Publication Type:Journal Article
- Keywords:
anal sphincter;
anal nerve;
puborectal nerve
- From:
Academic Journal of Second Military Medical University
1981;0(03):-
- CountryChina
- Language:Chinese
-
Abstract:
The auther dissected 168 adult and infant cadavers and the form and innervation of anal sphincter muscle complex (ASMC) were observed. It was found that there were individual variations in development of ASMC. The well-developed puborectalis accounted for 72.4%, the poorly developed 22.4% and no puborectalis 5.2%. Usually, the ratio of the thickness of the internal (IS) and external sphincter (ES) was 1: 1.5. Occasionally, IS was thinner than ES. Their ratio was 1 : 3 or 1: 5. On the other hand, IS might be 2~3 times thicker than ES. N. puborectalis existed in most cases. It mostly originated from the pelvic splanchnic nerve. The most frequent existence of the anal nerve (45.8%) was in those of single thunks originating from the perineal nerve. The clinical significance of ASMC in the ano rectal surgery is also discussed.
