Comparative Anatomy Vertebrates

  • Digestive System Of Bird Eg:Pegion Digestive System(Columba)
  • Digestive System Of Mammal Eg:Rabbit Digestive System(Oryctolagus)
  • Digestive System Of Reptile Eg: Lizard Digestive System(Calotes)

   In previous topic discussed about the comparative anatomy of digestive system of frog and shark in this topic i discussed about the comparative anatomy of digestive system of bird-mammal-reptiles.

Calotes is a poikilothermic and terrestrial lizard. Columba and Oryctolagus are warm blooded animals. Columba is adapted for mode of life-bird. Oryctolagus (Rabbit) is a mammal. The digestive system consists of alimentary canal and its associated digestive glands.

The living of the alimentary canal is mostly endodermal in origin being derived from the wall of the archenteron. Distinc' salivary glands secreting enzymes are present only in mammals. In reptiles, the oral glands are present in various positions termed labial, parotid, lingual & sublingual etc. The secretions of which serve primarily to keep the mouth moist and secondarily to facilitate the movements of the tongue. The other connected with the midgut and arising as out growth are the liver and pancreas.