Anatomy of Midgut and Hindgut Flashcards Preview

Gross III Exam 2 > Anatomy of Midgut and Hindgut > Flashcards

Flashcards in Anatomy of Midgut and Hindgut Deck (99)
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1

Where does the jejunum begin?

At the duodenojejunal flexure (just after SMA/SMV cross over) on Left side of L2 vertebra

2

About how long is the jejunum?

2-3m long

3

Is the jejunum intraperitoneal or retroperitoneal?

intraperitoneal (suspended by mesentery)

4

What quadrant do you find the jejunum?

LUQ

5

Where does the ileum end?

At ileocecal junction

6

How long is the ilium?

About 3-4m long

7

Is the ileum intraperitoneal or retroperitoneal?

intraperitoneal (suspended by mesentery)

8

What quadrant do you find the ileum?

RLQ

9

What is the primary function of the jejunum and ileum?

absorption of food stuffs

10

T/F - the transition between the ileum and jejunum can be externaly determined.

False - no external demarcation

11

What are the primary lymph nodes of the jejunum and ileum?

mesenteric nodes

12

What are the secondary lymph nodes of the jejunum and ileum?

superior mesenteric nodes

13

Where do the lymphatics from primary and secondary nodes of jejunum and ileum drain?

To cisterna chyli then to thoracic duct

14

Pertaining to the innervation of jejunum and ileum, what nerve plexus surrounds the SMA?

perivascular nerve plexus

15

How does the jejunum and ileum receive sympathetic innervation?

Via greater and lesser splanchnic nn (T8-T10); synapse in celiac and superior mesenteric ganglion

16

What do sympathetic nn. do to jejunum and ileum?

Reduce motility and sectretion, vasoconstriction

17

How does the jejunum and ileum receive parasympathetic innervation?

Via posterior vagal trunk; synapse on myenteric and submucosal plexuses

18

What do parasympathetic nn. do to jejunum and ileum?

Increase motility and secretion, vasodilation occurs secondarily

19

What is the path of the visceral afferents of jejunum and ileum?

Visceral afferents (pain) accompany sympathetics to T8-T10 dermatomes

20

What is ileal (Meckel's) diverticulum?

A rare(er) congenital anomaly; a finger-like pouch that is a remnant of embryonic omphaloenteric duct connecting midgut to umbilical vesicle

21

Where is an ileal diverticulum found?

Its about about 2 inches, seen on anterior ileum about 2 ft (look it up Canadians!) from ileocecal junction

22

Is an ileal diverticulum symptomatic?

Usually asymptomatic, (2% symptomatic)

23

An ileal diverticulum usually only contains ileal tissue, but what other type of tissue might it contain?

acid-producing gastric tissue or pancreatic tissue

24

What is the most common symptom seen with ileal diverticulum?

rectal bleeding

25

What might the pain of an ileal diverticulum mimic?

when inflammed, the pain of appendicitis

26

What are the main function of the colon?

Completing absorption (mostly water) and compacting/storing feces

27

What are the regions of the colon?

Cecum (with appendix), ascending, transverse, descending and sigmoid colon, rectum, anal canal

28

What are the external characteristics of the large intestine?

Teniae coli, haustra, and epiploic appendages

29

What are teniae coli?

3 bands of longitudinal smooth muscle in outer layer of muscularis externa beginning at appendix and broadening/merging at longitudingal layer around rectum

30

What happens when teniae coli contract?

tonic contraction shortens the walls of colon