. On the anatomy of vertebrates [electronic resource] . supials and Monotremes, the anal glands and the excitingorgans of generation. The anal follicles in Birds are lodged ina conical glandular cavity, k, which communicates with the pos-terior part of the outer compartment of the cloaca, and has ob-tained from its discoverer the name of Bursa Fabricii, § 149. Liver of Birds.—On the hypothesis of chylification, oron that of the formation of blood-discs, or on that of the pro-duction of grape-sugar in relation to the raising of animal heat,being essential functions of the liver, it might have b
. On the anatomy of vertebrates [electronic resource] . supials and Monotremes, the anal glands and the excitingorgans of generation. The anal follicles in Birds are lodged ina conical glandular cavity, k, which communicates with the pos-terior part of the outer compartment of the cloaca, and has ob-tained from its discoverer the name of Bursa Fabricii, § 149. Liver of Birds.—On the hypothesis of chylification, oron that of the formation of blood-discs, or on that of the pro-duction of grape-sugar in relation to the raising of animal heat,being essential functions of the liver, it might have been expected,since digestion is so much more active and the blood so muchmore abundant and rich, and the temperature so much higher inBirds than in Reptiles, that the liver would be proportionallylarger; but it is not so. e Carefully ascertained upon delicatebalances, the proportionate weight of the liver to the body is thesame in a Vulture as in a Tortoise, in an Owl as in a Bull-frog,in a Curlew as in a Corn-snake, in a Turkey as in an Alligator,. DIGESTIVE ORGANS OF BIRDS. 175 & My own observations show the liver to be relatively largestin the less active aquatic and land birds, smallest in the birdsthat fly best and breathe /<z ^ 87most: compared in the li-mits of the class the liverseems to be developed in-versely as the lungs andtheir appendages, and sofar as it is associated withthe lungs in eliminatingwaste elements from theblood, to have less to do inthat way, as the breathingorgans perform most. The liver, figs. 85, 87,m,m,is situated a little abovethe middle of the thoracicabdominal cavity, with itsconvex surface towrards theabdominal parietes, and itsconcavity turned towardsthe subjacent viscera: theright lobe covers the begin-ning of the duodenal loop,pancreas, and part of thesmall intestines; the leftlobe covers the proventri-culus and part of the giz-zard ; and the apex of theheart is received betweenthe upper ends of theseprincipal lobes. The liveris, a
Size: 1354px × 1844px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubject, booksubjectbirds, booksubjectfishes