A Case of Complete Disability of the Hand by Relaxed Articulation of the First Metacarpus and Trapezium, and Slipping of the Tendon and Extensor Brevis Pollicis; Post-Operative Result ...

The third metacarpus bone in the horse's leg supports much of the force conveyed as the animal moves. One side of the cucumber-sized bone has a pea-sized hole where blood vessels enter the bone.