Halakhah for Chullin 191:25
חות ביה טפי
IF A PERSON ATE AN OLIVE'S BULK OF THE SCIATIC NERVE etc. Samuel said: The Torah forbade only that part [of the nerve] which is on the spoon,<span class="x" onmousemove="('comment',' The muscles at the proximal end of the thigh are rounded and convex like the back of a spoon. Only that part of the sciatic nerve which runs in these muscles, says Samuel, is prohibited.');"><sup>11</sup></span>
Sefer HaChinukh
And [it] is practiced in every places and at all times by males and by females. And one who transgresses it and eats a [whole sciatic nerve], even if it is less than an olive's-worth - or eats a kazayit (the size of a large olive) from a large sciatic nerve - is lashed (see Chullin 96a).
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