• Stomach by SEM• Simple columnar epithelium with no glands in

submucosa and no villi

P

C

Stomach

• 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

Duodenum

Where are we?

Jejunum

• Plicae circulares are prominent.

• no glands in submucosa

• Long villi

• LOTS of Peyer’s patches is a giveaway that you are in the ileum.

• Kupffer cells

Pancreas

• Islets of Langerhans

• 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

• Conceptually

25-13

• Circulation

A

1. From which organ is this tissue section?2. What is structure ‘A’?3. The circle encompasses which structure?

1. What cell type is indicated by the black arrow?2. What structure is indicated by the red arrow?

1. What organ is this?2. Name the structure indicated by the arrow.

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/

1. What structures are indicated by the arrows from 9?

2. What structure is indicated by the black arrow?

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.

1. What area is indicated by the red arrows?2. Which part of the alimentary canal is seen in

this section?

Week 3

Identify the plica circulares in this photoWhere is the muscularis mucosae?

• Goblet cells

• The colon has no villi

• It has DEEP straight crypts

• Unlike the stomach, it has lots of goblet cells.

Stomach

• Rectum – No villi– Straight crypts

• Sublingual salivary gland1- mucous part of a mixed secretion unit2- serous demilune3- serous secretory unit4- mucous secretory unit5- myoepithelial cells

• parotid salivary glandWhat are 7 and 8?What is 2?