A CLINICO.PATHOLOGICAL STUDY OF ANAL FISTULAE

Anal Fbtttlr
Rrr.la* of Ltterawre
N.B, The valves are remttdnts of pmctodeal membmns whieh seprates
post allantoic gutfrom proctodean .
Above each valve is a pit l'3nun in depth (fual cn/pt) connected to
anal crypts are a variable number of glands (4-I0) traversing submueosa to
terminate in intersphincteric plane, if obstructed thie will lead to perianal
abscess and fistula. occasionally 2 glands open in the same crypt.
f
Cranial to anal valve the mucosa is throv*n into 8-14 longituclinal
folds (columns of Morgagni) below which lies internal hemonhoidal
plexus. Each adjacent 2 columns being connected at pcctinate line on anal
valve (Goligher, I 984).
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The mucosa aboye pectinate line is lined by severalayers of cuboidal
cells for '4-l cm from anal valves which gradually changes to single layer
of colurnnar cells whieh is characteristic of rectal epithelium (I{alls, 1958),
The color of mucosa changes from deep purple €r,ftending 0.5-lcm
above dentate line to pink characteristic of rectal mucosa.
This area above dentate line is ealled anal transitionT-ane (Dathte and
Bennett, 1963).
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Caudal to denttfie /ine modified squamous epithelium devoid of hair,
sebaceous and sweat glands. The lining epithelium is stratified squamous
with hair and glands at anal verge only.
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