. Elementary zoology. Zoology. BRANCH CHORD AT A: CLASS MAMMALIA 377 muscular sac, the bladder. The bladder opens to the exterior of the body by means of a short tube, the urethra. Cut open a kidney longitudinal]}' and examine the cut surfaces. The two egg-glands of the female mouse lie in the median portion of the abdominal cavity, somewhat below the kidneys, and from the vicinity of each runs an egg- tube. These tubes meet below the bladder, and open to the exterior of the body through the aperture noted below the anus. In the posterior parts of these tubes lie until birth the developing emb
. Elementary zoology. Zoology. BRANCH CHORD AT A: CLASS MAMMALIA 377 muscular sac, the bladder. The bladder opens to the exterior of the body by means of a short tube, the urethra. Cut open a kidney longitudinal]}' and examine the cut surfaces. The two egg-glands of the female mouse lie in the median portion of the abdominal cavity, somewhat below the kidneys, and from the vicinity of each runs an egg- tube. These tubes meet below the bladder, and open to the exterior of the body through the aperture noted below the anus. In the posterior parts of these tubes lie until birth the developing embryos. Technical Note.—For a study of the nervous system place the specimen ventral side down and cut through the skull with the bone- cutters or heavy scissors, exposing the brain and spinal cord. Note the large brain (fig. 149), composed of small optic lobes, large cerebrum, cerebellum^ and medulla oblongata, followed by the long spinal cord. Note the nerves aris- ing from the brain and spinal cord. For a careful dissection of the mammalian nervous system a larger mammal, such as a cat or dog or rabbit, should be used. For guide use a text-book such as, for the dog, Howell's " Dissection of the Dog " ; for the cat, Reighard and Jennings' lt Anatomy of the Cat " ; and for the rabbit, Parker's " Zootomy " or Marshall and Hurst's Sunfisb Toad Snake Sparrow Mouse Olf. L. Cbr. Md. Sp. Cd. Fig. 149. —Diagram of brains of vertebrates; Olf. Z., olfactory lobes; Cbr., cerebrum ; Md. Br., midbrain (optic lobes) ; CbL. cerebellum; Med. Ob., medulla oblongata; Sp. Cd., spinal cord. (From specimens.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kellogg, Vernon L. (Vernon Lyman), 1867-1937. New York : H. Holt and company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
