Biceps, triceps, quadriceps
![Biceps, triceps and quadriceps: muscles drawing showing the 2, 3, and 4 connecting origins of each, respectively](https://images.prismic.io/sketchplanations/25d24a60-59ea-409a-9a4b-27ce2753b7fe_SP+708+-+Biceps_+triceps%2C+quadriceps+-+outline.png?auto=compress%2Cformat&fit=max&w=3840&q=50)
One day after swimming front crawl, which works the triceps nicely, it all became clear. The triceps muscle has a curious shape at the top on account of its three 'heads' — or connecting origins. And the name derives from tri-ceps from Latin meaning three-heads. And so it goes. The biceps is a two-headed muscle attached with a long and short connection at the top. And the more complicated quadriceps has four heads that attach at the top, though they're a little harder to see.
Beyond this concept finally clicking for me, it was fun to emulate some of the anatomical graphical style of Leonardo Da Vinci — perhaps the ultimate at sketchplanations? — which I have long admired. For inspiration, this is a cracking collection: Leonardo Da Vinci the Graphic Works.
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