The Digestive SystemThe Digestive System

Overview of the Digestive SystemOverview of the Digestive System

Digestive Tract:Digestive Tract: Mouth, pharynx, and Mouth, pharynx, and esophagus, stomach, esophagus, stomach, small intestine, and small intestine, and large intestine (colon)large intestine (colon)

Accessory Organs:Accessory Organs:Teeth, tongue, salivary Teeth, tongue, salivary glands, pancreas, glands, pancreas, liver, and gallbladderliver, and gallbladder

Digestive system histologyDigestive system histology

Digestive system histologyDigestive system histology

Identify:Identify:

•MucosaMucosa

•SubmucosaSubmucosa

•MuscularisMuscularis

•Serosa or Serosa or adventitia?adventitia?

Adventitia or serosa?Adventitia or serosa?

Adventitia Adventitia (connective (connective tissue around tissue around organs organs superior to superior to diaphragm)diaphragm)

Serosa = Serosa = visceral visceral peritoneumperitoneum

Digestive system histologyDigestive system histology

Oral CavityOral Cavity

The PharynxThe Pharynx

• NasopharynxNasopharynx

• Oropharynx Oropharynx

• LaryngopharynxLaryngopharynx

Salivary GlandsSalivary Glands

The EsophagusThe Esophagus

StomachStomach

StomachStomach

Duodenum and Related OrgansDuodenum and Related Organs

Small Intestine – Gross AnatomySmall Intestine – Gross Anatomy

• Three subdivisions:Three subdivisions:

duodenum, jejunum, duodenum, jejunum, and ileumand ileum

Gross Anatomy of Large IntestineGross Anatomy of Large Intestine

•Cecum

•Appendix

•Ascending

•Transverse

•Descending

•Sigmoid colon

•Rectum

•Anus

Pancreas and GallbladderPancreas and Gallbladder

GallbladderGallbladder

• Stores and concentrates bileStores and concentrates bile

• Expels bile into duodenumExpels bile into duodenum• Bile emulsifies fatsBile emulsifies fats

Visceral Surface of the LiverVisceral Surface of the Liver

Microscopic Anatomy of LiverMicroscopic Anatomy of Liver

MesenteriesMesenteries

• Superficial view of Superficial view of the abdominal organsthe abdominal organs

MesenteriesMesenteries

• Greater omentum and Greater omentum and transverse colon reflectedtransverse colon reflected

MesenteriesMesenteries

• Sagittal section through Sagittal section through the abdominopelvic cavitythe abdominopelvic cavity