Reference for Chullin 151:25

אמר רב אשי

That part with is off the bone.<span class="x" onmousemove="('comment',' The aggregated tendons of the leg are at their lower extremity attached to the tuber calcis ( or heel bone) , they run upwards along the leg, first adhering to the tibia for a short distance and then separating from the bone and expanding into the muscles of the leg. According to Rabbah the most vital part of the juncture is from the point where it separates from the bone until it expands into the leg muscles. V. Diagram at end of Tractate.');">¹⁵</span>

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