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Jejunum & Ileum
notes
14
Anatomy
Graduate
09/28/2011

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Cards

Term
Which part of SI is 2/5?
Definition
Jejunum
Term
Ileum is ?/5 of SI
Definition
3/5
Term
What is the route of The Mesentery?
Definition
Duodenojejunal junction to ileocecal junction

- obliquely, inferiorly, and to the right
Term
Vessels pass through what to enter The Mesentery?
Definition
subserous fascia
Term
Describe The Mesentery at the jejunum:
Definition
1) translucent
Term
Describe The Mesentery at the ileum:
Definition
1) fatty & opaque
- more fat absorption here
Term
serosa of SI = ?
Definition
visceral peritoneum
Term
Plicae circulares are what?
Definition
1) Folds of the mucosa & submucosa

2) more numerous & packed in jejunum

3) wall of jejunum is thicker
Term
What is Meckel's Diverticulum?
Definition
1) outcropping of ileum

2) antimesenteric side

3) remnant of embryonic yolk stalk
- 1-2% of pop.
- more freq. in males
- 1 m prior to ileocecal junction

4) composed of:
- gastric & pancreatic tissue
- yolk stalk contains undifferentiated tissue
Term
What are some complications of Meckel's Diverticulum?
Definition
1) peptic ulcers

2) tumors

3) inflammation

4) if attached to ant. abd. wall:
- decreases motility of SI
- SI can become wrapped around or entangled
- volvulus
Term
Innervation of Jejunum & Ileum
Definition
1) Symp
- inhibit peristalsis & secretion
- initiates vasoconstriction
- Pre-ganglionic
- synapse on celiac, sup. mes., inf. mes. ganglia
- sacral splanchnics
- originate in thoracic cord
- pass through paravertebral ganglia
- synapse in inf. hypogastric plexus

2) Para
- increases peristalsis & secretion
- cranial (vagus)
- intertwine in upper aortic
- Pre-ganglionic
- supplies everything sup. mes. artery supplies
plexus (none in lower aortic plexus)
- sacral (Pre-ganglionic)
- pelvic splanchnics
- pass through pelvic plexus
- supply hindgut
Term
Lumbar splanchnics
Definition
1) aortic plexus

2) pre-ganglionic
Term
Greater & lesser splanchincs
Definition
1) Pre-ganglionic

2) synapse at celiac & aorticorenal ganglia

3) travel down to upper aortic plexus as Post-ganglionic
Term
What type of fibers does aortic plexus contain?
Definition
1) Pre & post ganglionic symp

2) Pre-ganglionic para

3) afferent
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