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Horse Skeleton
Skeleton of Equus Horse and Outline of Contour of Body [3]
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[1] Secretariat (Horse), Wikipedia online encyclopedia, as modified May 5, 2014 
[2]Incredible Creatures that Defy Evolution, DVD, (Reel Productions, LLC, 2004)
[3] Sisson, Septimus, The Anatomy of Domestic Animals, 2nd Ed. (Philadelphia: W.B. Saunders Co., 1914), 32.  Nomenclature used here differs in some cases from that used in this book.
1. Mandible with Teeth
1486 Fd. at horse ranch in Michigan, USA  
Note: The following pictures are intended to show the shape details and not the relative sizes.
6. 1st Thoracic Vertebra
1470 Fd. with 1474 above
3. Atlas Vertebra
1548 Fd. ground surface
4. ?th Cervical Vertebra
1471 Fd. with 1474 above
4. Axis Vertebra
 1474 Fd. ground surface of farm land in Rhode Island, USA 
(Portion of left traverse process is missing.)
9. Sacrum
1641Fd. unknown location
 1 - mandible;  2 - skull;  3 - atlas vertebra;  4 - axis vertebra;  5 - cervical vertebrae;  6 - 1st thoracic vertebra;  7 - thoracic vertebrae;  8 - lumbar vertebrae;  9 - sacrum;  10 - caudal vertebrae; 11 - pelvis;  12 - femur;  13 - fibula;  14 - tibia;   15 - calcaneum;  16 - astragalus; 17 - metatarsals;  18 - 1st phalanx;  19 - 2nd phalanx;  20 - 3rd phalanx;  21 - hoof;  22 - sesamoid;  23 - tarsals;  24 - metacarpals+;  25 - carpals;  26 - radius; 27 - ulna; 28 - humerus; 29 - scapula; 30 ribs.  Not all bones have been called out.  Some bones have more than one name depending on the nomenclature used by a particular branch of science. 
15. Calcaneum
                        1472 Fd. with 1474 above                                                                       1205  Fd. Badlands, South Dakota?, USA  
                               4.9"x2.0"x2.0"                                                                                   Mirrored views   2.4"x1.0"x0.9" (fossil)           
16. Astragalus
            1378 Fd. Southeastern USA  supposedly                                                     1029 Fd. Badlands, South Dakota, USA
         on site with Clovis and Paleo artifacts (fossil)                                                               (fossil)    Mirrored views   
                                2.2"x 2.3"                                                                                                    1.6"x1.7"
                                
                                                 
                
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    Horses are amazing creatures.  They were first domesticated about 3,000 years ago and have been major sources of transportation and used to power equipment such as plows in farming. 
 
    Secretariat  was the first horse to win the Triple Crown in horse racing (Kentucky Derby, Preakness Stakes, and Belmont Stakes) in twenty-five years and set speed records in all three races. [1]   An autopsy at his death indicated his advantage was having a much larger heart than normal.  
 
    The heart of a horse is too small for their body size (i.e. will not be able to effectively pump enough blood).  Horses have four extra little pumps: one in each hoof.  In the hoof, surrounded by hard tissue is a v-shaped soft tissue called a frog.  When a horse steps down on a hoof, the soft tissue compresses pushing up against a series of mechanisms inside the hoof and squeezes the blood in the veins up the leg.  When the hoof is off the ground, blood flows down the leg. [2]
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