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Histological structure of upper alimentary system
 

Histological structure of upper alimentary system

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histological structure of mouth, teeth, oesophagus, Gaster and duodenum

histological structure of mouth, teeth, oesophagus, Gaster and duodenum

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    Histological structure of upper alimentary system Histological structure of upper alimentary system Presentation Transcript

    • The Histologic Structure of Upper Alimentary Tract I Wayan Sugiritama Medical Faculty of Udayana University 2008
    • HISTOLOGY OF UPPER ALIMENTARY TRAC T
      • Digestive system composed of :
      • ORAL CAVITY
        • Histologic Structure of Lips
        • Histologic Structure of Palate
        • Histologic Structure of Teeth
        • Histologic Structure of Tongue
      • ALIMENTARY TRACK
        • Histologic Structure of Esophagus
        • Histologic Structure of Stomach
        • Histologic Structure of Small intestine
        • Histologic Structure of Large Intestine
        • Histologic Structure of Rectum and Anal Canal
      • ASSOCIATED GLAND
        • Salivary Gland
    • ORAL CAVITY
      • The first steps of digestion
        • Food moisten by saliva (Parotid, Submandibular & Sublingual, & minor salivary glands)
        • Ground by teeth  smaller pieces
        • Initiation digestion of carbohydrate
      •  Moistened the food + chewed  BOLUS
    • HISTOLOGIC STRUCTURE OF THE ORAL CAVITY
      • The oral mucosa compose by
      • epithelium and connective tissue:
      • Masticatory mucosa:
        • covers the surfaces involved in the processing of food (tongue, gingivae and hard palate).
        • Strat. Sq. E. keratinized to different degrees
      • Lining mucosa:
        • covers the remaining surfaces of the oral cavity
        • non-keratinised strati. sq. epithelium
      • Specialized mucosa :
        • Taste buds
    • HISTOLOGIC STRUCTURE OF THE HARD AND SOFT PALATE
      • Separate the oral
      • and nasal cavity
      • Hard Palate
        • Keratinized St. Sq. Epith.
        • Dense. Irreg. Coll. C.T
        • Rests on bony tissue
      • Soft Palate
        • Non-keratinized St. Sq. Epith
        • Irreg. Coll. C.T.
        • Minor Salivary Glands
      • Uvula ~ Soft Palate
    • Histologic Structure of Lips
      • The core: skeletal muscle fibers
      • External (skin) aspect:
        • Thin skin, with sweat glands, hair follicles, & sebaceous gland
      • Vermilion zone :
        • Thin skin, capillary loops close to the skin  pink color
      • Internal (mucous) aspect:
        • Strat. Sq. non-keratinized epith.
    • Pharynx
      • Transition : oral cavity-respiratory-digestive system
      • Lined by :
        • Strat. Sq. Epith.
        • Ciliated Pseudostrat. Colum. Epith. (respiratory portion)
      • Contains the tonsil
    • Histologic Structure of Teeth
      • Mineralized
        • Enamel
          • Consist 96% calcium
          • Enamel rods coated with organic matrix
        • Dentin
          • Consist 70% calcium
          • Dentinal tubules
        • Cementum
          • Consist 50% calcium
          • Cementocytes within lacunae
      • Pulp
          • Loose connective Tissue with nerve and blood vessels
    • Structure Associated with Teeth
      • Periodontal Ligament
        • Suspend the tooth in its socket
        • Dense irregular connective tissue
      • Alveolus
        • Bony Socket
      • Ginggiva (gums)
        • Keratinized St. Sq. Epith.
        • Dense collagenous connective tissue
      Periodontal. L. ALVEOLUS CEMENTUM
    • Histologic Structure of Tongue
      • Bulk of skeletal muscle fibers
      • Dorsal surface :
        • Irregular
          • Anterior (2/3)
            • Lingual papillae
          • Sulcus terminalis
          • Posterior (1/3)
      • Ventral Surface
        • Mucous membrane is smooth
    • LINGUAL PAPILLAE
      • Filiform
      • Elongated conical shape
      • Keratinized. Strat. Sq. Ep.
      • (-) taste buds
      • Fungiform
      • Mushroom (slender stalk & broad cup)
      • Nonkeratinized Strat. Sq. Ept.
      • (+) taste buds
    • LINGUAL PAPILLAE
      • Circumvallate
      • V-shape (7-12)
      • Submerge into the surface of tongue
      • Ducts of glands of Von Ebner
      • + T aste B uds
      • Foliate
      • Appear as vertical furrows
      • Poorly develope
    • TASTE BUDS
      • Intraepithelial sensory organs  perception of taste
      • ± 3000
      • Composed by :
        • 60-80 spindle shape cells
          • Basal cells
          • Dark Cells
          • Light Cells
          • Intermediate Cells
        • The narrow end  taste pore
      • Nerve fibers
    • GENERAL STRUCTURE OF ALIMENTARY TRACT
      • Mucosa
        • Epithelium
        • Lamina Propia
        • Mucularis mucosae
      • Submucosa
      • Muscularis externa
      • Adventitia
    • ESOPHAGUS
      • Muscular tube
      • Transport foodstuffs (BOLUS) from mouth to the stomach
    • Histologic Structure of Esophagus
      • Mucosa
        • Strat. Sq. Non Keratinized E.
        • Lamina Propia (unremarkable)
          • esophageal cardiac glands  mucus coat
          • Muscularis mucosae
      • Submucosa
        • Dense fibroelastic C.T.
        • Esophageal glands proper
          • Mucous
          • Serous  Pepsinogen & lysozyme
      • Muscularis Externa
        • Skeletal & smooth muscle
      • Adventitia
    • STOMACH
      • Responsible for the formation & processing of ingested food  CHYME
      • Digestion
        • HCL
        • Pepsin
        • Rennin
        • Gastric lipase
    • Histologic Structure of Stomach
      • Mucosa
      • Epithelium
        • Simp. Colum. Epit.  PROTECTIVE MUCUS
        • Invaginate  Gastric pits
      • Lamina propia
        • Loose C.T
        • Branch Tubular Glands  open into gastric pits
      • Muscularis mucosae
        • Smooth muscle
      • Submucosa
        • Dense irreg. coll. C.T.
      • Muscularis externa
        • Three layer of smooth M.
    • CARDIAC REGION OF STOMACH
      • Simple tubular cardiac gland
      • Shallow of gastric pits
      • Base of glands is highly coiled
      • Cells population mostly surface lining epith
      • (-)chief cells
      • Mucus & lyzosyme
    • FUNDIC REGION OF STOMACH
      • Branch Tubular gastric glands
      • Type of cells :
        • Surface lining cells
        •  mucus
        • Regenerative cells
        •  regeneration
        • Mucous neck cells
        •  mucus
        • Parietal (oxyntic) cells
        •  HCL & intrinsic factor
        • Chief (zymogenic) cells
        •  pepsinogen & lipase
        • DNES cells 
    • PYLORUS REGION OF STOMACH
      • Deep of gastric pits
      • Short, higly convulated, branch gland
      • Predominant cells is mucous neck cells  mucus & lysozyme
      • Gastrin cells
      •  gastrin  HCL production
      • D cells
      •  somatostatin
    • Histologic Structure of Stomach
    • HISTOLOGIC STRUCTURE OF DUODENUM
      • Small intestine
      • Digest food
        • Enzyme
        • bile
      • absorb end product
        • Plicae circulares
        • Villi
        • microvilli
    • THANK YOU FOR YOUR ATTENTION