Histology: Esophagus, Stomach, Duodenum, Ileum & Large Intestine

ESOPHAGUS
Identify the layers:

1. Mucosa
2. Submucosa
3. Muscularis
4. Serosa

source: http://faculty.une.edu/com/abell/histo/histolab3c.htm

source: http://www.ouhsc.edu/histology/text%20sections/connective%20tissue.html

source: http://www.siumed.edu/~dking2/erg/GI006b.htm

GASTROESOPHAGEAL JUNCTION:
Remember the trasnsition int he histology from stratified squamous to simple columnar.

source: http://webanatomy.net/histology/digestive_histology.htm

source: http://www.eugraph.com/histology/digest/index.html

source; http://legacy.bluegrass.kctcs.edu/natural_sciences/biology/bio_139_virtual_lab/virtual_lab_5/histology_of_digestive_system/

STOMACH
Can you identify the gastric pits and chief and parietal cells?

source: http://legacy.owensboro.kctcs.edu/gcaplan/anat2/notes/APIINotes8%20Digestive%20Anatomy.htm

CLICK IMAGE TO ENLARGE VIEW: Source; http://www.rivm.nl/interspeciesinfo/intra/human/stomach/

source: http://www.siumed.edu/~dking2/erg/GI079b.htm

CLICK IMAGE TO ENLARGE VIEW: Source; http://www.esg.montana.edu/esg/kla/ta/digest.html

DUODENUM

SOURCE: http://www.ouhsc.edu/histology/Glass%20slides/52_06.jpg

Brunner's glands (or Pancreal glands or "duodenal glands") are compound tubular submucosal glands found in that portion of the duodenum which is above the hepatopancreatic sphincter (Sphincter of Oddi). The main function of these glands is to produce a mucus-rich alkaline secretion (containing bicarbonate) in order to:

• protect the duodenum from the acidic content of chyme (which is introduced into the duodenum from the stomach);
• provide an alkaline condition for the intestinal enzymes to be active, thus enabling absorption to take place;
• lubricate the intestinal walls.

They are the distinguishing feature of the duodenum, and are named for the Swiss physician who first described them, Johann Conrad Brunner.
source; http://en.wikipedia.org/wiki/Brunner%27s_glands

TRANVERSE OF DUODENUM

source; http://www.ouhsc.edu/histology/text%20sections/lower%20gi.html

ILEUM: FYI: Remember: Peyers Patches
I did this histology on a previous post
Click Here: Anatomy Time: Ileum

LARGE INTESTINE: COLON
Remember and Identify: Goblet Cells

source: http://biology.clc.uc.edu/fankhauser/Labs/Anatomy_&_Physiology/A&P203/Digestive_Sys_Histology/Digestive_Sys_Hist.html

source: http://www.ouhsc.edu/histology/text%20sections/lower%20gi.html

source: http://www.ouhsc.edu/histology/text%20sections/lower%20gi.html

source: http://www.pathologyoutlines.com/colon.html