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An in-depth exploration of the small intestine, its division into three parts (duodenum, jejunum, and ileum), and its functions in digestion, absorption, and secretion. Key features include plicae circulares, intestinal villi, microvilli, and various types of cells (goblet, absorptive, Paneth, and endocrine) in the small intestinal gland. The document also discusses the muscularis, serosa/adventitia, and regional differences in the small intestine.
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*small finger- or leaf-like projection of the mucosa,
found only in the small intestine; varying in the form and height in different regionbeing covered by epith.*having a core of lamina propria withcapillary network, a central lacteal andfew smooth muscle fibers.
The inner surface of small intestine can be greatly enlarged by:* plicae circularesX 3.* villiX 10.* microvilliX 20.
gland
Core of villusepithelium
Artery Lacteal
vein
Smooth muscle
Goblet c.Absorptive c.Paneth cStem c.Endocrine c.
located toward the base.
striated border
formed by closely
packed, parallel microvilli
goblet cells
{
{
{
function:secrete mucus.
Paneth cells
EM of paneth cell
glial cell
Nerve cell
Lymphatictissue
duodenum
jejunum
ileum
Glands insubmucosa
Present
none
none
Goblet C.
leaf-like
Villi shape
finger-like
becoming smaller
aggregated lymphatic nodule
scattered lymphacytes,solitary lymphaticnodule
Same as induodenum