Digestive System in Amphibians

Digestive System in Amphibians

Digestive System in Amphibians

The process of breaking down of complex food into simpler forms with the help of various enzymes is known as digestion. The system that deals with with this process of digestion is known as digestive system.
Digestive system of Amphibians can be studied under  following  two headings:-

  1. Alimentary Canal
  2. Digestive Glands

Digestive system in Amphibians

  1. Alimentary Canal
    1. Mouth and buccal cavity
      Mouth in amphibians is a transverse wide opening present at the tip of their head and is surrounded by hard cornified skin forming immovable lips. Mouth is followed by a wide buccal cavity which consists of structure like teeth and tongue.

      Teeth are present in both jaws in salamanders, only in upper jaw in frogs while teeth are completely absent in toads. Teeth in them are of homodont, acrodont and polyphyodont type.Tongue in them is muscular, sticky and protrusible in nature.
    2. Pharynx
      Buccal cavity in them is followed by a short pharynx that simply leads to oesophagus.
    3. Oesophagus
      Oesophagus in them is also a short due to the absent of neck. It is wide tubular organ that helps to conduct food towards the stomach.
    4. Stomach
      Stomach in them is a wide, elongated and muscular sac like organ differentiated into anterior wider cardiac stomach and posterior narrower pyloric stomach. Stomach internally consists of no. of gastric glands secreating various chemicals to digest food.
    5. Small intestine
      It is an elongated , narrow and coiled structure separated from stomach by narrow pyloric constriction. Small intestine in them is differentiated into anterior short duodenum and posterior long ileum. Small intestine internally consists of no. of intestinal glands that secretes intestinal juice containing various enzymes to digest food. Small intestine also has finger like projection called villi to absorb digested food.
    6. Large intestine
      Large intestine in them is a short, wide and tubular organ that basically helps in temporary storage of undigested food materials.
    7. Cloacal aperture
      It is the terminal opening of large intestine through which undigested food materials are eventually passed outside .
  2. Digestive glands
    • Liver
      Liver in amphibians is a large, flat and usually bilobed gland situated just below their heart. It secretes  bile responsible for emulsification of fats. Bile is stored in gall bladder present in between the two lobes of liver.
    1. Pancreas
      Pancreas in them is a diffused and irregular shapes gland attached by mesenteries in the loop between stomach and duodenum. It secretes pancreatic juice containing various enzyme to digest food.

If you want to learn about Digestive System in Pisces/Fishes Click Here.

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