Evolutionary Variation
In the horse, 84%, 15% and 3% of the total muscle weight correspond to the long, lateral and medial heads, respectively.
Many mammals, such as dogs, cows and pigs, have a fourth head, the accessory head. It lies between the lateral and medial heads. In humans, the Anconeus is sometimes loosely called "the fourth head of the triceps brachii."
Read more about this topic: Triceps Brachii Muscle
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