Midterm paper

MODULE 10 LO3 Digestive System: Large Intestine Histology Dr. Lisa Brinn [email protected]

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Large Intestine • Subdivisions:

v Cecum o Appendix

v Colon o Ascending

Ø Right colic flexure (hepatic) o Transverse

Ø Left colic flexure (splenic) o Descending o Sigmoid

v Rectum o Rectal valves

v Anal canal o Anus

Ø External anal sphincter Ø Internal anal sphincter

Large Intestine Histology • Histology:

v Mucosa o Lymphoid nodule

v Submucosa v Muscularis externa

o Circular muscle o Longitudinal muscle

Ø Taenia coli v Serosa

• Nervous plexus v Myenteric plexus v Submucosal plexus

Large Intestine Unique Features • Taenia coli

v Decreased longitudinal muscle layer • Haustra

v pouch-like structures v Help with digestion

• Epiploic appendages v Fat-filled sacs

Lab Models