Rectum

Question 1

What is the rectum?

Answer 1

the part of the large intestine between the sigmoid colon and the anal canal

Question 2

What is the rectosigmoid junction?

Answer 2

the upper limit of the rectum, located at the middle of the sacrum

Question 3

What is the anorectal junction?

Answer 3

the lower limit of the rectum, located at the upper border of the pelvic diaphragm

Question 4

What does the puborectalis form?

Answer 4

a sling (puborectal sling) around the rectum at the anorectal junction

Question 5

What is the rectal ampulla?

Answer 5

dilated terminal portion of the rectum, immediately above the pelvic diaphragm

Question 6

What are the transverse rectal folds?

Answer 6

• shelf-like projections

- there are three within the rectum

Question 7

What are missing from the rectum?

Answer 7

• mesentery
• omental appendices
• haustra

Question 8

What are the taeniae coli of the rectum like?

Answer 8

spread out to form a more complete outer layer

Question 9

Describe the peritoneal covering of the rectum.

Answer 9

• upper third: peritoneum covers the front and sides
• middle third: peritoneum covers front
• lower third: no peritoneum covering