SmallBowel

SmallBowel - SmallBowel VithalVernenkar,D.O St.BarnabasHospital Dept.Surgery Anatomy 280cmlong JejunumbeginsatLOT,noclear demarcationtoileum ,large

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
    Small Bowel Vithal Vernenkar, D.O. St. Barnabas Hospital Dept. Surgery
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Structural and Functional  Anatomy 280cm long Jejunum begins at LOT, no clear  demarcation to ileum Jejunum has long vas recta, large  plicae, thick walls, transparent  mesentery Ileum has short vasa, small plicae, thin  walls, fat in the mesentery.
Background image of page 2
Structural and Functional  Anatomy Mesentery attaches the small intestine  to the posterior abdominal wall. Contains nerves, blood vessels,  lymphatics, lymph nodes, and fat.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Structural and Functional  Anatomy Lymph tissues known as Peyer’s  patches are abundant. SMA supplies the midgut structures  (duodenum distal to the ampulla,  pancreas, small intestine, ascending  and transverse colon.)
Background image of page 4
Histology Four layers Mucosa  turns over every 3-7 days Submucosa  contains vessels, nerves, lymph,  Meissner’s plexus. This layer provides the  major strength when suturing Muscularis  outer long layer, inner circ layer Adventitia  is a layer of visceral peritoneum
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Physiology (CHO) Daily CHO load is 350g of starch,  lactose, sucrose Initial enzyme digestion is by pancreatic  and salivary amylase CHO broken down to monosaccharides  by microvilli
Background image of page 6
Physiology (Protein) The  jejunum  is responsible for 80-90%  of  protein absorption Proteins are converted by acid and  pepsin from stomach to polypeptides Acid is neutralized and pepsin is  inactivated as chyme enters the  duodenum
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Physiology (Protein) Trypsinogen  is activated from  pancreas to  trypsin  by enterokinase in  the duodenum Trypsin activates  chymotrypsin  and  elastase, further digesting polypeps Amino acids and dipeptides are  absorbed
Background image of page 8
Physiology (Fats) Emulsification begins in the stomach Fat enters the duodenum, where  pancreatic and biliary secretions mix Lipase breaks down fats in to  monoglycerides, which are absorbed by  diffusion
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Physiology (Fats) In epithelial cells, triglycerides are  resynthesized, chylomicrons are formed  and enter the lymphatic system thru  small lacteals Bile salts are reabsorbed in the ileum Most of the excreted fat comes from  desquamated cells and bacteria
Background image of page 10
Minerals, Vitamins) Iron  is absorbed mainly in the  duodenum Most minerals  and water soluble  vitamins  absorbed in jejunum B12  is absorbed only in terminal ileum Of the 5-10 liters entering the small  bowel, only 500cc enter the colon.
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/01/2012 for the course PDBIO 305 taught by Professor Woods,a during the Fall '08 term at BYU.

Page1 / 45

SmallBowel - SmallBowel VithalVernenkar,D.O St.BarnabasHospital Dept.Surgery Anatomy 280cmlong JejunumbeginsatLOT,noclear demarcationtoileum ,large

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online