. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. 134 Practical (a) the conical shape of the whole ; compare this with the chest cavity, as shown in a skeleton; (^) how the lungs nearly sur- round the heart; (r) the concave posterior surface of the lungs where they fitted the convex anterior surface of the diaphragm; (d) the groove between the dorsal surfaces of the lungs in which the spinal column fitted; («r) the smooth, undivided dorsal surface of the lungs, and their division ventrally into lobes; (/) the relative lengths of the dorsal and ventral surfaces of
. Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. 134 Practical (a) the conical shape of the whole ; compare this with the chest cavity, as shown in a skeleton; (^) how the lungs nearly sur- round the heart; (r) the concave posterior surface of the lungs where they fitted the convex anterior surface of the diaphragm; (d) the groove between the dorsal surfaces of the lungs in which the spinal column fitted; («r) the smooth, undivided dorsal surface of the lungs, and their division ventrally into lobes; (/) the relative lengths of the dorsal and ventral surfaces of the lungs. The anterior end of the lung is the apex; the posterior end is the base. Open the valve of the faucet. »v'hat makes the air go out? Again inflate. Does it require effort to do so ? Why ? Cut off the end of one lobe and again inflate. Does the air escape ? Throw a piece of lung on water. Pinch a piece of lung, holding it near the ear. The smooth, moist, glistening membrane covering the lung is the pleura. 5. Observe a large whitish or yellowish tube running in the groove between the dorsal surfaces of the two lungs. It is usually covered with fat. It may have been cut off short, so that its open end is easily seen near the windpipe. This is the main artery, the aorta. Take hold of its free end and separate it from its attachment to the other tissues, cutting close to it with the scissors, so far as where it arches over the root of the left lung. Now turn the free end forward. 6. Find where the gullet is cut off posteriorly; slit it open for an inch or two, and note its whitish lining, the mucous coat. The thick red coat is the muscular coat; it has an inner layer of circularly arranged muscular fibers and an outer longitudinal layer. Beginning posteriorly, separate the gullet from the wind- pipe, cut off the windpipe about the middle, and entirely remove the gullet and larynx. 7. Examine the windpipe ; insert a finger, and stretch it; note its C-shaped cartilages.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1903
