limbsHorses have very technical legs. They are composed of all the same things as our arms and legs. However, a difference difference between horses and humans and their legs and our legs, that horses have hooves and we have feet. Another difference is that we have arms where horses don't. Horses have to depend on humans for help with a lot of things, because we have the resources to assist. For example, we have opposable thumbs that can help us to lift and move things. To wrap up, horse limbs and people limbs have a lot of similarities along with a lot of differences.
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internal
Horses have very complex internal systems. Their systems are very similar to our own. They have the same vital organs: lungs, heart, colon, diaphragm, intestines, etc. Similarly to our internal systems, we need to keep them clean, unclogged and in working condition. Certain feed mixtures and vaccinations and supplements can assist in the maintenance of these vital systems. All in all, just like humans, horses need their vital insides to be in tip top shape to keep them going.
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external
There is so much about a horse's external anatomy that is different and hard to get a handle on. Horses have a lot of bones, like people, but they are different names and locations for the most part. For instance, the fetlock, "Commonly called the ankle of the horse, but it does not have the same skeletal structure as the ankle of a human. Rather, it is similar to the ball of the foot or the metacarpophalangeal joints in the fingers of humans" (Dinsdale, 2015, p. 1). Horses, however, have a lot of simple names as well. For example, the back. There are no different sections of the back, it is just called, the back. To conclude, horses are very complex, and complicated creatures in pretty much any aspect looked at.
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How did horses come to get this current anatomy?
Horses have come a long way to get to where they are today. They have gone from three "toes" to one, to being the size of a dog to being up to 16 "hands"! Which means "a horse that measures 60 inches is 15 hands high (15 x 4 = 60) and a horse halfway between 15 and 16 hands is 15.2 hands, or 62 inches tall (15 x 4 + 2 = 62) Because the subdivision of a hand is a base 4 system, a horse 64 inches high is 16.0 hands high, not 15.4" (2018, p. 1). We are lucky to have these magnificent creatures as companions.