Digestive System Functions and Anatomy

Digestive System Objectives: Discuss the general functions and anatomy of the digestive tract Describe the individual organs of the system, including a discussion of the gross and microscopic anatomy.

Digestive System Muscular, hollow tube (= “digestive tract”) + Various accessory organs consists of:

Function ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The function of the system as a whole is processing food in such a way that high energy molecules can be absorbed and residues eliminated. Individual parts function in:

Histological Organization ,[object Object],[object Object],Muscularis externa 1 2 3 4

The 4 Layers of the Gut ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Membranes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Oral Cavity ,[object Object],[object Object],[object Object],[object Object],[object Object]

Three pairs of Salivary Glands ,[object Object],[object Object],[object Object],[object Object],1-1.5 l / day for digestion (?) lubrication (swallowing) moistening (tasting)

Structure of Teeth ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Types and Numbers of Teeth Dental succession Deciduous (baby, milk) teeth - 20, replaced by Permanent teeth - 32 teeth

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Gross Anatomy of the Stomach

Histology of Stomach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Regions of Small Intestine ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Structure of Small Intestinal Wall

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Regions of Large Intestine Fig 25-17 Rectum – terminal end is anal canal - ending at the anus - which has internal involuntary sphincter and external voluntary sphincter

Rectum and Anus ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],Histology of Large Intestine

Liver ,[object Object],[object Object],[object Object],[object Object],[object Object],Microscopic anatomy: Liver lobules and triads

Liver ,[object Object],[object Object],[object Object]

Liver, cont’d ,[object Object],[object Object],[object Object]

Microscopic anatomy: Liver lobules and portal triads ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],See Fig 22.23

Gall Bladder ,[object Object],[object Object],[object Object],[object Object],Gall Stones

Pancreas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Pancreas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Digestive System Functions and Anatomy

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