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Digestive System I:Gastrointestinal Tract - Coggle Diagram
Digestive System I:Gastrointestinal Tract
Small Intestines
Jejunum
4 principle layers
Submucosa
No gland
*Plica circularis or Valve of Kerckring : fold
of mucosa & submucosa
Muscularis externa
Mucosa
intestinal villi in lumen
Simple columnar epith. with goblet cells
Lamina propria : intestinal gland or crypt
of Lieberkuhn (simple straight tubular gl.)
secrete intestinal juice
Muscularis mucosae
Serosa
Mesothelium (visceral peritoneum)
Ileum
4 principle layers
Submucosa
Aggregated lymphatic nodule
(lymphocyte) : Peyer’s patches
Muscularis externa
Mucosa
Simple columnar epith. with goblet cells
(more than duodenum & jejunum)
Lamina propria : intestinal gland or
crypts of Lieberkuhn
Muscularis mucosae
Serosa
Mesothelium
Duodenum
4 principle layers
Submucosa
Brunner’s gland : mucous gl.
secrete alkaline mucous to protect
intestinal wall
Muscularis externa
Mucosa
Simple columnar epith. with goblet cells
Lamina propria : intestinal gland or crypt of Lieberkuhn(simple straight tubular gl.)
Adventitia
Large Intestines
4 principle layers
Submucosa
No gland BUT has blood vss. & lymphatic nodule
Muscularis externa
Mucosa
No intestinal villi or plica circularis
Simple columnar epith. with goblet cells (more than duodenum & jejunum),
secrete mucus to lubricant
Lamina propria : intestinal gland or crypts of Lieberkuhn
Serosa
Mesothelium
Vermiform Appendix
4 principle layers
Submucosa
Many lymphoid tissue & lymphatic nodule
Difficult to separate mucosa & submucosa
Muscularis externa
Mucosa
Simple columnar epith. with goblet cells
Less of intestinal gland
Lamina propria : Many lymphoid tissue &
lymphatic nodule
Serosa
Mesothelium
Oral Cavity
Components
Wall
Cheek
Palate
Lip
musculofibrous folds
gums by superior & inferior
frenula
Area
Oral mucosa
non-keratinized
stratified squamous epith.
mixed seromucous gl.
Red area (vermillion zone)
thin keratinized stratified squamous
epith
vascular connective tissue papillae
Cutaneous area (thin skin)
stratified squamous epith. with skin appendages
Internal structures
Tongue
attached to floor of oral cavity
Mass of skeletal m.
Dorsal surface :mucous membrane (non-keratinized stratified squamous epith.)
with taste buds & lingual papillae
Lingual Papillae
Fungiform papillae
with stratified squamous epith.
with taste buds.
Shaped-like mushroom
Circumvallate papillae
Dome-shaped
with lateral cleft called trench
keratinized stratified squamous
epith. with taste buds around cleft
Von Ebner’s gland : serous gl. below cleft
Filiform papillae
Do not contain taste buds
keratinized stratified squamous epith.
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Overlapping, brush-like processes
Foliate papillae
non-keratinized stratified
squamous epith. with many taste buds
Leaf–like ridges of mucosa, short vertical
folds
Only found in fetus
Teeth, Gum& Duct of salivary glands
Tooth
Crown
Dentin & Enamel
Periodontal membrane
attached teeth
with gum, maxilla & mandible
Neck
Root
within gum
Dentin, Cementum & Periodontal
membrane
Pulp cavity
Dental pulp : loose connective tissue
with nerves & blood vss.
Gum
keratinized stratified squamous epith.
Long vascular papillae in lamina propria
Stratified Squamous Epithelium
Keratinized
Gum & hard palate
Non-Keratinized
soft palate, lips, cheeks &
floor of mouth
Esophagus
4 principle layers
Submucosa
Esophageal gland : mucous gl.
Muscularis externa
Upper : skeletal m.
Middle : skeletal & smooth m.
Lower : smooth m.
Mucosa
Non-keratinized stratified squamous epith
Lamina propria of loose cnt.
Muscularis mucosae
Adventitia
Stomach
4 principle layers
Submucosa
with collagen & elastic fibers
Muscularis externa
Smooth muscle 3 layer
middle circular
outer longitudinal
inner oblique
Mucosa
rugae
Simple columnar epith. with short microvilli
Lamina propria : gastric glands
(Simple tubular / Branched tubular gl.)
Mucous neck cells : mucous to protect acid
Chief or Zymogenic cells
Pyramidal shape
Oval nucleus close to cell base
pepsinogen & gastric lipase
Blue cytoplasm
Parietal or Oxyntic cells
secrete HCl
Large oval shape
Oval nucleus in center of cell
Reddish cytoplasm
Serosa
Simple squamous epith. (mesothelium) : visceral peritoneum
Rectum & Anal Canal
(Recto-Anal Junction)
4 principle layers
Mucosa
Rectum
Simple columnar epith.
Many Crypt of Lieberkuhn
Anal canal
Stratified squamous epith.
No gland
Muscularis mucosae : split in CNT
Submucosa
Muscularis externa
Skeletal m.
Inner circular. (int. anal spincter)
Outer longitudinal
Adventitia
Alimentary Tract
Common Characteristics
Esophagus → Stomach → Small & Large Intestine
→ Anal Canal
4 principle layers
Submucosa
Loose connective tissues
blood vessels
Meissner’s plexus
control muscularis mucosae contraction & secretory activities
lymph nodules in duodenum (Brunner’s gland)
Muscularis externa
2 layers; inner circular & outer longitudinal
except esophagus that has skeletal m.
Auerbach’s (myenteric) plexus peristalsis
Serosa or Adventitia
loose connective tissue
Tract that covered with peritoneum : serosa
with mesothelium
Tract without peritoneum : adventitia
Mucosa
Lamina propria
loose connective tissues rich in blood & lymph vessels
Muscularis mucosae
thin smooth muscle cells
Epithelial membrane
simple columnar epith.
stratified squamous epith. (esophagus & anus)
