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Radiographic Positioning > Lower GI > Flashcards

Flashcards in Lower GI Deck (18):
1

Common radiographic procedures for lower GI:

Small bowel series and barium enema.

2

What is a small bowel series?

-Radiographic exam of the small bowel.
-It frequently follows UGI.
-Called SBFT (Small bowel follow through)
-Requires oral contrast media

3

What is a barium enema?

Called: BE, lower GI Series, Colon.
Study of large intestine

4

Three parts of the small intestine:

Duodenum
Jejunum
ileum

5

Where does the small intestine begin?

At the pyloric valve.

6

Describe the duodenum:

Located within RUQ and LUQ.
Shortest, widest and most fixed.
Joins jejunum at duodenojejunal flexure at LUQ.
Shortest part of S.B.

7

Describe the Jejunum

Located within LUQ and LLQ.
Means “empty” because at death it’s found empty.
Makes up 2/5ths of S.B.
Begins at the site of duodenojejunal flexure under transverse colon.

8

Bulk of chemical digestion and nutrient absorption occurs in

Jejunum

9

Where are the plicae circulares located?

Within the jejunum.

10

What is the function of the plicae circulares?

increase surface area to aid with absorption

11

How do the plicae circulares appear radiographically?

Produce feathery appearance of jejunum

12

Describe the ileum:

Located within RUQ, RLQ and LLQ.
Distal 3/5ths of S.B.
Longest portion.
Thinner wall and fewer plicae circulares
The last portion of the ileum is called the terminal ileum.
Joins large intestine at ileocecal valve (sphincter or fold).

13

The ileocecal valve is located

in the RLQ of abdomen.

14

What is the function of the ileocecal valve?

Controls the flow of chyme from the ileum to cecum

15

Describe the duodenum:

C-shaped.
Distal to stomach.
2nd &3rd portions contain more plicae circularis that contain villi.

16

How does the duodenum appear radiographically?

The duodenum appears feathery as a result of the plicae circulares that contain villi.

17

The Jejunum also contains plicae circularis, however:

The number and size of folds gradually diminish as jejunum merge with ileum.

18

Describe the ileum:

Located within RUQ, RLQ, and LLQ.
Smoother.
Fewer indentations.
Less feathery.
Internal diameter gets smaller from duodenum to ileum.