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CHAPTER SEVENTEEN
Digestive System
Intestinal gland
Lymph nodule
Villi
Lacteal
Epithelium
Mucous gland in submucosa
Mucosa
Circular muscle
Longitudinal muscle
Muscular
layer
Circular muscle
Longitudinal muscle
Serosa
Artery
Vein
Mesentery
Circular fold
Mucosa
Submucosa
Serosa
Nerve
plexuses
Simple columnar
epithelium
Capillaries
Lacteal
Microvilli
Nucleus
Goblet cell
TABLE
17.1
|
Layers of the Wall of the Alimentary Canal
Layer
Composition
Function
Mucosa
Epithelium, connective tissue, smooth muscle
Protection, secretion, absorption
Submucosa
Loose connective tissue, blood vessels, lymphatic vessels, nerves
Nourishes surrounding tissues, transports absorbed materials
Muscular layer
Smooth muscle f
bers in circular and longitudinal groups
Movements oF the tube and its contents
Serosa
Epithelium, connective tissue
Protection, lubrication
FIGURE 17.3
The wall oF the small intestine, as in other portions oF the alimentary canal, consists oF Four layers: an inner mucosa, a submucosa,
a muscular layer, and an outer serosa.
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