Veterinary Practitioners' Bulletin Volume 2-4

Veterinary Practitioners' Bulletin Volume 2-4

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ... way. Let us understand just why the foot does swing out. It is an anatomical necessity. The shoulder joint of a horse is not exactly a ball and socket joint, but it permits of a lot of rotation. The elbow joint is a pure hinge joint, like the strap hinge on a barn door. It permits extension and flexion in one plane, with no rotation possible. The carpal joint is an imperfect hinge joint, with the chief movements that of flexion. The fetlock joint is an absolutely pure hinge joint, with no rotation possible at all. The coronary joint is almost a pure hinge joint; the coffin joint is nearly a pure hinge joint; so that the only joint in the leg that permits rotation is the shoulder joint. All joints below are hinge joints. Take an animal that is prone to stand base-wide or toewide. His toes point out. His elbows are quite close to his body. In order to walk, he has to shorten his leg and in order to clear the ground he has to flex the joints. His toes point forward and outward, and the axis of the joint is not transverse to the body but is at an angle with the body. When he flexes, he does it not in a plane parallel to the long axis of the body, but in a plane which is at an angle to the long axis of the body. So that when he flexes he flexes back toward the median line, and when he extends, he extends forward away from the median line. In the act of flexion he has to bring the foot close to the supporting leg, and in the act of extension he has to carry it away. If his toes were straight ahead, he would flex and extend just in a line of movement, and in that flexion and extension the foot would not pass away from the supporting leg, but when he flexes and extends in another plane, in flexion he comes close to the supporting leg. Q. Can a...show more

Product details

  • Paperback | 158 pages
  • 189 x 246 x 9mm | 295g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236786645
  • 9781236786647