His closed fist, held down and back, seemed to clutch invisible wires that stretched to every key spot of his lanky, fleshless body, under the ragged pants and shirt, to the long, swollen tendon of his bare arm, to the taut cords of his neck.
There are no more uses of "tendon" in the book.
Show samples from other sources
She ruptured her left Achilles’ tendon.
Peony’s fingers twitched when Cinder hit a tendon, making her jump.