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• Stomach by SEM• Simple columnar epithelium with no glands in
submucosa and no villi
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P
C
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Stomach
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• Stomach – No glands in submucosa and no villi• Duodenum – Brunner’s glands• Jejunum – No glands in submucosa– Noticeable plicae circulares
• Ileum – Peyer’s patches• Colon – No villi, long, straight crypts
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Duodenum
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Where are we?
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Jejunum
• Plicae circulares are prominent.
• no glands in submucosa
• Long villi
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• LOTS of Peyer’s patches is a giveaway that you are in the ileum.
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• Kupffer cells
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Pancreas
• Islets of Langerhans
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• The blood from the umbilical cord essentially bypasses the fetal liver
• In the fetus this is called the ductus venosus
• After birth the ductus venosus closes
25-12
Its remnants are the ligamentum venosum, round ligament and falciform ligament
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• Conceptually
25-13
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• Circulation
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A
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1. From which organ is this tissue section?2. What is structure ‘A’?3. The circle encompasses which structure?
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1. What cell type is indicated by the black arrow?2. What structure is indicated by the red arrow?
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1. What organ is this?2. Name the structure indicated by the arrow.
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1. What part of the alimentary canal is this?2. What structure is indicated by the red arrow?
(spelling counts!)3. What structure is indicated by the black
arrow/
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1. What structures are indicated by the arrows from 9?
2. What structure is indicated by the black arrow?
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Lamina propria is loose connective tissue above the muscularis mucosae
Where is the plica circulares?
Brunner’s glands in the submucosa are diagnostic of the duodenum.
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1. What area is indicated by the red arrows?2. Which part of the alimentary canal is seen in
this section?
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Week 3
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Identify the plica circulares in this photoWhere is the muscularis mucosae?
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• Goblet cells
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• The colon has no villi
• It has DEEP straight crypts
• Unlike the stomach, it has lots of goblet cells.
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Stomach
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• Rectum – No villi– Straight crypts
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• Sublingual salivary gland1- mucous part of a mixed secretion unit2- serous demilune3- serous secretory unit4- mucous secretory unit5- myoepithelial cells
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• parotid salivary glandWhat are 7 and 8?What is 2?