Dr Navneet Kumar Professor Anatomy .KGMU LKO

Histology of lower gastro Histology of lower gastro intestinal tractintestinal tract

By Navneet kumarProfessor Department of Anatomy KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Lower G.I.T

• Intestine• Small Intestine• -Duodenum• -Jejunum• - ileum • Large intestine (Colon)• -Appendix • -Rectum

-Anal canal

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Gross features of intestine

• Small Intestine• Villi• Valve of kerckring (plicae

circularis)• crypts of lieberkuhn

(intestinal glands)• Large intestine• No Villi• Sacculation +nt• Teania coli +nt• Appendices epiploicae

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Small intestine -Duodenum

1.Mucus membrane -epithelium -Intestinal villi - Simple columnar - Goblet cells -lamina propria intestinal glands (crypts

of lieberkuhn) -muscularis mucosae2.Submucosa Brunner's gland3.Musculalis layer -inner circular -outer longitudinal4. Serosa

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Intestinal glands

• Absorptive cells• Paneth cells• Goblet cells• Endocrine cells

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Duodenum

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Small intestine -Jejunum

1.Mucus membrane -epithelium- Simple columnar - intestinal villi -lamina propria intestinal glands (crypts of

lieberkuhn) -solitary Lymphoid nodule -muscularis mucosae2.Submucosa -NO gland 3.Musculalis layer -inner circular -outer longitudinal4. Serosa

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Small intestine -jejunum

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Small intestine -ILeum

1.Mucus membrane -Epithelium - Simple columnar - intestinal villi -Lamina propria intestinal glands (crypts of

lieberkuhn) - Muscularis mucosae2.Submucosa -aggregated Lymphoid

nodule (peyers patches) - mircofold cells (“M” Cell)3.Musculalis layer -inner circular -outer longitudinal4. Serosa

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Small intestine -ileum

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Large intestine

1.Mucus membrane -epithelium - Simple columnar - Goblet cells are more - villi are absent -lamina propria intestinal glands (crypts

of lieberkuhn) -muscularis mucosae2.Submucosa 3.Musculalis layer -inner circular -outer longitudinal4. Serosa or adventitia

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Large intestine

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Large intestine

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Appendix

1.Mucus membrane -epithelium- Simple

columnar - villi are absent -lamina propria intestinal glands (crypts of

lieberkuhn), lympgoid tissue

-muscularis mucosae2.Submucosa Lymphoid nodule 3.Musculalis layer -inner circular -outer longitudinal4. Serosa

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Appendix

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Dr Navneet Kumar Professor Anatomy .KGMU LKO

Anorectal junction