Comparative anatomical study of the large intestine in rabbit and chinchilla.

Abstract

Anatomical particularities\tof\tthe\tdigestive\ttract\tin\tthe\trabbit\tand\tchinchilla\trequire\tcareful\tevaluation due the\tfact\tthat\tthese\ttwo\tspecies\tare\tused\tboth\tas\texperimental\tmodel\tor\tpets. We\tstudied\tthe\ttopography of large\tintestine\tin\tten\trabbits\tand\tten\tchinchillas\tusing\tregional\tand\tstratigraphic\tdissection. Focusing on anatomical\tparticularities\tas\twell\tas\tdifferences,\t the\taims\tof\tthis\tstudy\tis\tan\taccurate\tdescription\tof lower digestive\ttract\tin\trabbits\tand\tchinchillas. The\tlarge\tintestine\thas\tthe\tsame\tsegments:\t cecum,\t colon and rectum. The\tcecum\tof\tthe\trabbit\tis\tlarge,\t show\tno\tmuscular\tstrips,\t containing\t55 %\t of\tdry\tmatter of the\tlarge\tintestine,\t compared\twith\tchinchilla,\t in\twhich\tthe\tvolume\tof\tthe\tcecum\tcontaining\t20 %\t of dry matter\tof\tlarge\tintestine. Ascending\tcolon\tof\trabbit\tis\tvery\tcoiled,\t shows\tfour\tsegments:\t proximal one (ampula\tcoli),\t 10\tcm\tlength,\t with\tthree\tpowerful\tmuscular\tbands\twhich\tseparates\trows\tof\tmultiple haustra;\t the\tsecond\tportion\thas\tonly\tone\tmuscular\tband\tand\tfewer,\t smaller\thaustra;\t the\tthird\tpart\t(fusus coli)\t is\tshort,\t about\t4\tcm\tlength\tbut\thigh\tvascularizated\tand\tinnervated;\t the\tfourth\tportion\tis\tvery\tshort and is\topen\tin\tdescending\tcolon. In\tchinchillas,\t ascending\tcolon\thas\tthree\tparts:\t proximal\tloop\twith\ttwo distinct areas,\t simple\tintermediate\tportion,\t and\ta\tlong\tdistal\tportion\textending\tto\tthe\tright\tcolic\tflexure. The last\t segment\t consists\t of\t two\tparallel\t parts\t joined\tby\t an\t apical\t flexure. Transverse\t colon\t is\t very