Elementary Lessons in Zoölogy: a Guide in Studying Animal Life And Structure ...
Elementary Lessons in Zoölogy: a Guide in Studying Animal Life And Structure ...
James George Needham
The book Elementary Lessons in Zoölogy: a Guide in Studying Animal Life And Structure ... was written by author James George Needham Here you can read free online of Elementary Lessons in Zoölogy: a Guide in Studying Animal Life And Structure ... book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Elementary Lessons in Zoölogy: a Guide in Studying Animal Life And Structure ... a good or bad book?
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Sever the muscles from the keel- by a single longitudinal cut on each side of it, keeping the knife close to the bone. Continue the cuts laterally around the posterior edge of the sternum, severing the attachment (origin) of a great flap of muscle. Lift up the loosened posterior end of this great muscle, and observe it separating from a smaller muscle, which has its origin in the angle between the horizontal part of the sternum and the keel. The larger muscle is the pectoralis major; the smalle...r one, the pectoralis minor. Digitized by VjOOQIC 222 VERTEBRATES. Dissect these breast muscles free from all attachments except their insertions, and, while doing so, look for veins, arteries, and nerves, entering the muscles near the shoulder. The removal of the pectoral muscles discloses the enor- mously developed sternum, with its sharp keel and its lateral ribs. The V-shaped bone in front of the sternum is the wishbone or merrythought, and is made up of the two clavicles grown solidly together at their inner ends.
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