digestive system.pdf by ZubairLatif

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									DIGESTIVE SYSTEM

     08-05-12
               DIGESTIVE YSTEM
• Alimentary canal ------ Mouth to Anus
        –   Mouth an& Pharynx
        –   Esophagus & Stomach
        –   Small intestine
        –   Large intestine
        –   Anal canal
                Mouth & Pharynx
• Oral Cavity (cavum oris)
     • Functions
     • Mouth (0s)
            »   lips
            »   Oral cavity and its walls
            »   Tongue & teeth
            »   Salivary glands

                The degree to which the mouth opens varies b/w species
                              depending on feeding habits
                      Oral cavity
• Vestibule
           » Labial
           » Buccal

• Proper oral cavity
                            Lips
• Function

The form of the lips is determined by diet & feeding habits
• Philtrum
• Nasolabial plate ----- ox
                Palate (palatum)
• Hard
         – Series of transverse ridges
         – Papillae on ridges in ruminants
         – Incisive papilla

• Soft
         – Ventral surface ----- oral mucosa
         – Dorsal surface ------ respiratory mucosa
            Tongue (lingua, glossa)
• Function
• Apex
• Body
        • Frenulum
•   Root
•   Lingual fossa
•   Cartilago dorsi linguae
•   Intrinsic & extrinsic
    musculature
                            Papillae
• Local modifications of lingual mucosa

  Distribution, size, number & form are characteristics of each
                              species
• Mechanical papillae (More in number than Gustatory)
              » Filliform (Smallest & Most numerous)
              » Conical (Largest & Less frequent)
              » Marginal (newborn carnivores and piglets)

• Gustatory papillae
              » Fungiform
              » Vallate
              » Foliate
                 Salivary gland
• Minor
           » Mucosa of lips, cheeks, tongue, palate & sublingual oral
             floor
           » Buccal ----- ox
           » Mucous secretion
• Major
           » Parotid, Sublingual & Mandibular
           » Serous & Seromucous
Daily saliva prod.
     H= 40 L
     OX= 110 – 180 L
               Oesophagus
• Tube b/w Pharynx & Stomach
• Cervical, Thoracic & Abdominal portions
• Cardiac sphincter
    STOMACH (gaster, ventriculus)
• Interposed b/w esophagus and SI
• Form (Compartments)
       – Simple
       – Compound / Complex
                         Cont.
• Mucosal characteristics:
           » Glandular
           » Composite

• Simple glandular: dogs & cats
• Simple composite: horse & pig
• Complex composite: ruminants
     Simple composite stomach
• Sac shaped dilation
        –   Cardiac portion
        –   Fundus
        –   Body
        –   Pyloric portion
        –   Visceral & parietal surfaces
        –   Greater & lesser curvature

• Horse gastric capacity = 5-15 L
• Well developed cardiac sphincter & oblique
  entrance of esophagus into the stomach
                  Blood supply
• Coeliac artery
           » Left gastric artery
           » Hepatic artery
           » Splenic artery
COMPOUND/COMPLEX STOMACH

        RUMEN




                            RETICULUM
                   OMASUM



                ABOMASUM
              BLOOD SUPPLY
• Branches of Coeliac artery
• left & right ruminal artery
• Gastric & gastroepiploic arteries
                  INTESTINE
• LENGTH (Times the body length)
          » CARNIVORES = 5
          » EQUINES = 10
          » RUMINANTS = 20-25
OX
PANCREAS – HORSE
quadrilateral in form, and
lies almost                    PANCREAS – OX
entirely to the right of the
median Plane
LIVER- OX
LIVER- HORSE

								
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