A CLINICO.PATHOLOGICAL STUDY OF ANAL FISTULAE

AnalFbtula
ReYtew olllterature
Anel Cannl Musculnture
The muscles form a hrbe within funnel the side of the funnel are
levator ani while the stem is E.A.S. (exter,nal anal sphincter). The tube
inside the stem is tAS (internal anal sphinctet) (McMinn, 1990) *
I.A.S.
. Visceral in origin
r Continuous above with circular muscle coat of the rectum
. Below ends with well defined rounded edge l-l t/z em below
dentate line
. 0.2-0.3mm thick and it surrounds the entire canal
(Eisenhummer, 1953).
*
E.A.S.
. Somatic in origin.
r It is an elliptic cylinder muscles'
r Continuous with puborectali superiorly
. Inferiorly it becomesubcutaneous Extends lower than I'A.S.
r Although in fixed specimens E.A.S. extends lower than I'A'S'
however at opetatior I.A.S. is usually fomd to be lower
F
furatomical Texts described 3 parts of E.A.S. which are surgically
indistinguishable flyaH h, I I 79).
Subcutaneous part directly below I.A.S. can easily differentiatedue
to its division by longitudinal muscle fibers into 8'12 bundles.
*