Jejunum and ileum (Dave's notes)

Question 1

Describe the Jejunum relative to the ileum

Answer 1

• Wider bore
• thicker walls, “double” walled
• lies in the upper part of abdomen (more proximally)
• contributes approximately 2/5ths of length

Question 2

Describe the Ileum relative to the jejunum

Answer 2

• Narrower bore
• thinner walls
• lower reachers have an antimesenteric border of elongated whitish plaques which are aggregaed lymphoid follicles (= peyer’s patches)
• lies in the lower part and down into the pelvis
• comprises approximately 3/5th of length,

Question 3

What is the blood supply of the jejunum?

Answer 3

• From the SMA
• single arcades which give off straight arteries
• These arteries are long and narrowly spaced for the jejunum

Question 4

What is the blood supply of the ileum?

Answer 4

• From the SMA
• with 3-5 arcades and shorter more widely spaced straight arteries than the jejunum

Question 5

How does the mesentary differ between these two sections of small bowel?

Answer 5

There is more fat in the mesentary of the ileum than the jejunum

Question 6

What is the lymphatic drainage of the ileum and jejunum?

Answer 6

Via the SM nodes

Question 7

What is the nerve supply of the jejunum and ileum?

Answer 7

Parasympathetic and sympathetic

Question 8

What is the course and role of the parasympathetic supply to the ileum and jejunum?

Answer 8

The parasympathetic supply travels via vessels and normally augments peristaltic activity

Question 9

What is the course and role of the sympathetic supply to the ileum and jejunum?

Answer 9

The sympathetic supply is a vasoconstrictor and inhibits peristalsis peristalsis, and transmits pain which is usually felt in the umbilical region. Course??