Digestive system

• GIT is essentially a muscular tube.

• Regional variations reflecting the changing functions.
• Accessory organs

Includes:

Mouth (oral cavity)
pharynx
Esophagus
Stomach
Small intestine
Large intestine
Digestive Tract


• Accessory Digestive Organs:
• Lips
• Teeth
• Tongue
• Gall bladder
• Salivary glands
• Liver & pancreas







LIP
TOOTH
HARD PALATE
SOFT PALATE
TONGUE
VESTIBULE

SALIVARY GLANDS

• Parotid
• Submandibular
• Sublingual

• LIVER

• PANCREAS
• GALLBLADER

HARD & SOFT PALATE

palate respiratory side

palate oral side

Tongue is a Skeletal muscle covered by mucous membrane

GI tract wall has 4 layers(tunics):

Mucosa.
Submucosa.
Muscularis Externa.
Serosa or Adventitia.

Mucosa; 3 layers:

Epithelium.
Lamina propria (loose ct : contain capillaries & some elements of MALT).
Muscularis mucosa.
Submucosa: moderately dense CT with blood, nerve, lymph vessels & lymphoid follicles; rich in elastic fibers.

Muscularis externa: smooth muscle:

Circular layer.
Longitudinal layer.

Serosa or Adventitia:

is the outermost layer Serosa is a serous membrane consisting of a layer of simple squamous epithelium, called the mesothelium, and a small amount of underlying connective tissue.