The end part of the small intestine opening into the caecum.
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Impulsion
Controlled energy in forward movement of the horse.
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Independent Seat
When the rider has enough balance and technique to use his/her seat, body, legs and hands all independently of what the horse is doing.
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Indirect Rein
The opposite rein to the direction in which a horse is turning. When giving an indirect rein aid, the instruction to turn comes by pressing the opposite rein against the horse's neck.
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Inside Leg
The leg or legs of rider or horse on the inside of a circle or track being ridden.
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Irons
Stirrup irons are metal items to tack attached to the saddle by the stirrup leathers to hold the rider's feet.
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Irregular bones
Are the vertebrae of the spine. Of different shapes, they protect the spinal cord, providing support and form a base for muscle and rib attachment.
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Ischium
One of three bones of the pelvis which forms the back of the pelvis floor.
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Ivy
(Hedra) clambers over trees and in hedgerows often reaching a great size, it produces greenish-yellow flowers in the autumn and is rarely eaten by horses and ponies but it is poisonous.