Anal Canal Flashcards
The anal canal is approximately who long?
1 1/2 inches
The anal canal is derived from two embryologic origins. What are they?
The endoderm and the ectoderm
The junction between these two embryological origins (Endo- and ectoderm) is called what?
pectineal line
What are the longitudinal folds in the anal mucosa called? Where do the occur?
Columns of Morgagni
Above the pectineal line
The columns are connected inferiorly by mucosal folds called what?
Valves of Ball
Where do the anal glands open?
Behind the valves (of Ball)
The anal canal is directed ______ and _______.
Posteriorly
inferiorly
The anorectal junction is pulled anteriorly by the ______ part of which muscle?
puborectalis
Levator ani
The anal canal is guarded by which two spinsters?
Internal circular and external
The internal circular sphincter is made up of what kind of muscle?
Smooth muscle
The external sphincter has how many parts? What are they?
Three
Deep, superficial, submucosal
The external sphincter has what kind of muscle?
skeletal
The external sphincter is supplied by which branch of which nerve?
Inferior rectal branch
Pudendal nerve
