Small intestine

 

This consist of the ileum and jejunum. and the duodenum

The small intestine has the following coats from inner to outer coats

bullet

Mucous layer

bullet

Submucous layer

bullet

Muscular layer

bullet

Serosus layer (or serosa)

Mucous layer: This has three layers as follows- Muscularis mucosae is the most external,  epithelium (the most internal), and lamina propria (which is the middle). The epithelium carries intestinal villi while the mucosa itself is disposed in circular folds (valvulae conniventes).

Submucosa in the jejunum has no special features

Muscularis is the muscular coat and it has inner circular, outer longitudinal smooth muscles

Serosa is the outermost lining of peritoneum (visceral peritoneum)

The small intestine is completely intraperitoneal and therefore has an anchor to the posterior abdominal wall known as mesentery.

Comparison between jejunum and ileumi with reference to jejunum

bullet

Jejunum  is about 4 cm in diameter and hence larger than ileum which is about 3.5 cm in diameter.

bullet

It is thicker walled

bullet

It is redder and therefore more vascularized

bullet

Its mesentery has a few arterial arcades (1-2) with long branches.

bullet

Its villi are larger

bullet

Its circular folds are bigger

bullet

Aggregated lymphatic follicles (Peyer’s patches) are absent or few in the  jejunal mucosa.

bullet

Circular folds can be felt through the wall of the jejunum like a shirt sleeve under a coat

bullet

Jejunum lies in the paraumbilical area.

bullet

Mesentery of jejunum is thicker walled

bullet

Mesentery of jejunum has more fat.

 

 

 

There is nothing in anatomy not found in this website

© Electronic School of Medicine
Creator: Oluwole Ogunranti

 
Gut (intestines)- 3D

 

 

 

 

 

 

 

 

 

 

 

 

 

   

 

DIGITAL LOCATOR OF STOMACH: Layer 1 Skin of abdomen (anterior abdominal wall). Layer 2- Layer of Camper's fascia. Layer 3 - layer of Scarpa's fascia. Layer  4 - layer of external oblique muscle/aponeurosisLayer 5- layer of rectus sheath. Layer 6- layer of internal oblique. Layer 7 - layer of transversus abdominis. Layer 8- layer of transversus abdominis/parietal peritoneum. Layer 9- layer of greater sac of peritoneum. Layer 10- layer of small intestine and stomach. Roll over mouse to remove label. Layer 10 of abdomen

 

 

 

 

Cell Biology

Embryology

Histology

Gross anatomy

Lymphatic drainage

Organ integration
Clinical anatomy

Clinical examination
Quiz

Dissector

Physiology

Biochemistry

Chemical Pathology

Anatomical Pathology

Pharmacology

Imaging

Medicine

Surgery

Main Subject Course Links

eAnatomy eAnesthesia eBiochemistry eChemical pathology eCommunity Health
eDermatology eENT eGynecology eHematology eImaging
eMedicine eMedical microbiology eObstetrics eOphthalmology ePathology
ePediatrics ePharmacology ePhysiology ePsychiatry    eSurgery/eOrthopedics
eLab eOSCE eProcedures eInvestigations eSchool/Videopage
eOrgans eLocator Anatomy Museum eDissector eFractures/Dissect-it-yourself
All diseases eClerking eTreatment eDoctor ePatient