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DIGESTIVE SYSTEM (STRUCTURES (DENTITION (Child/Primary/Deciduous …
DIGESTIVE SYSTEM
GASTROINTESTINAL TRACT
ACCESSORY ORGANS
Teeth
Tongue
Salivary Glands
Liver
Pancreas
Gallbladder
HISTOLOGY
SEROSA/ADVENTITIA
MUSCULARIS EXTERNA
Outer, Longitudinal
Inner, Circular
MYENTRIC NERVE PLEXUS in betw.
SUBMUCOSA
Blood, Lymphatic Vessels
SUBMUCOSAL NERVE PLEXUS
MUCOSA
Epithelium w/ Goblet Cells
Lamina Propria (Blood, Lymph vessels, Lymph NODULES)
Muscularis Mucosa
Cells
Intestine =
Enterocytes
Liver =
Hepatocytes
STRUCTURES
ORAL CAVITY
- Lips
- Cheeks
- Palate
HARD [2 Maxillae + 2 Palatine]
SOFT [+ UVULA]
- Tongue
[+ Papillae]
SALIVARY GLANDS
Parotid
Mumps
Submandibular
Sublingual
DENTITION
Child/Primary/Deciduous
Adult/Secondary/Permanent
Central Incisor (1)
Lateral Incisor (1)
Canine (1)
Premolar
(ONLY for ADULTS [2])
Molar (C-2) (A-3)
Tooth Structure
Crown
(Dentin + Enamel Overlay)
Root
(Dentin + Cementum Overlay)
Neck
(Enamel + Cementum Boundary/Gums)
Periodontal Ligaments
Root Canal
(blood and lymph vessels + nerves)
extend to Pulp Cavity
OROPHARYNX + LARYGOPHARYNX
Only Muscularis Externa and Strat. Squamous Epi.
ESOPHAGUS
Have all of the Layers but ... Exceptions
Adventitia has NO EPITHELIUM
Muscularis Externa (Upper = Skeletal M) (Middle = Skeletal + Smooth) (Lower = Smooth)
STOMACH
Has Greater and Lesser Curvature that converts food into
CHYME
Cardiac
Fundus (most superior)
Body
Pyloric (w/ P. Sphicter)
Muscularis Externa
Outer, longitudinal
Middle, circular
Inner, OBLIQUE
RUGAE
Folds of Submucosa + Mucosa
Stomach Mucosa
GASTRIC GLANDS [Exocrine] contain:
Chief Cells
(secrete PEPSINOGEN and GASTRIC LIPASE)
Parietal Cells
(HCl)
G / Enteroendocrine Cells
(GASTRIN Hormone)
Goblet Cells
SMALL INTESTINE
Pyloric Sphincter --> Ileocecal Valve
Epithelium of Mucosa have
Enteroendocrine cells
secreting
SECRETIN and CCK
[Cholecysoskinin] Hormones
S.I. ACCESSORY ORGANS
Pancreas
Head, Body, Tail
Exocrine Glands => PANCREATIC Juice =
Acinar/Acini Cells
secrete DIGESTIVE ENZYME
Duct Cells
secrete ALKALINE FLUID
Endocrine Glands =>
Islets of Langerhans/Amid Acini
secrete
INSULIN
(decrease blood sugar) +
GLUCAGON
(increase)
Hormones
Liver
Right, Left,
QUADRATE
,
CAUDATE
Bile
Gallbladder
RUGAE,
NO SUBMUCOSA
Stores Bile
Duodenum (Secrete ALKALINE MUCOUS)
Jejunum
Ileum (has Lymph Nodules called
Peyer's Patches
)
Help Increase Absorption SA
Plicae Circulares
Villi
(w/ Capillaries and
LACTEALS
)
Microvilli
LARGE INTESTINE
Ileocecal Valve --> Anus
-
CAECUM
-
Appendix
-
Colon
[Ascending, HEPATIC Flexure, Transverse, SPLENIC Flexure, Descending, Sigmoid]
[
Taeniae Coli
,
Haustra
,
Epiploic Appendages
]
-
Rectum
-
Anus
Internal Smooth Muscle and External Skeletal Muscle
PERITONEUM
A Serous Membrane (Parietal, Peritoneal Cavity w/ Serous Fluid, Visceral)
Serosa
Double layer of Visceral Peritoneum
Lesser Omentum
Greater Omentum
Mesentary
Double layer of Parietal P.
Retroperitoneal
Anterior: Parietal P.
Posterior: CT [
Adventitia
]