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20 Cards in this Set

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  • Back
What is located at the end of the large intestine and runs from the pelvic diaphragm to anus?
Anal Canal
What is the transition from the rectum to the anus?
Anal Canal
What contains the ampulla which is where fecal matter gathers before defecation?
Anal Canal
**__________ acts as a sling on the anal canal to put a bend in it when we are not defecating. During defecation, the __________ relaxes so that the anal canal straightens out.
The pelvic diaphragm
***The __________ anal sphincter is the superior 2/3 of the anal canal. It is composed of involuntary smooth muscle.
Internal
***The __________ anal sphincter is the inferior 1/3 of the anal canal. It is composed of voluntary skeletal muscle.
External
What sphincter is innervated by the inferior rectal branch of the pudendal nerve?
External anal sphincter
What is an important demarcation in the anal canal?

It is the connection between endoderm and ectoderm.
Pectinate line
What marks the transition from simple columnar epithelium with microvilli and goblet cells of the large intestine to stratified squamous epithelium that is first non-keratinized, but then changes to keratinized stratified squamous epithelium as it approaches the anus?
Pectinate line
What tissue type is above the pectinate line?
Simple columnar epithelium with microvilli and goblet cells
What tissue type is below the pectinate line?
Non-keratinized stratified squamous epithelium
What artery is above the pectinate line and where does it branch from?
Superior rectal artery branching off the inferior mesenteric artery
What artery is below the pectinate line and what artery does it branch from?
Inferior rectal artery branching off the internal pudendal artery
What vein is above the pectinate line and what vein does it branch from?
Superior rectal vein branching off the inferior mesenteric vein, which branches off the portal system
What vein is below the pectinate line and what vein does it branch from?
Inferior rectal vein branching off the pudendal vein, which comes from the internal iliac vein from the inferior vena cava
What sphincter is above the pectinate line?
Internal anal sphincter
What sphincter is below the pectinate line?
External anal sphincter
What muscle type is above the pectinate line and what type of innervation does it receive?
Smooth muscle receiving autonomic innervation
What muscle type is below the pectinate line and what type of innervation does it receive and from what nerves?
Skeletal muscle receiving somatic innervation from inferior anal and rectal nerves
What nerves do the inferior anal and rectal nerves branch off?
Pudendal nerve