BT Ḥul 51b(39) :ניברא לא חייש׳‏ : (if the bird fell on) the web we do not consider the possibility (of its being internally injured)
See the entire entry for nḇārā n.m. part of the palm tree

BT Ḥul 51b(39) :קיטמא{ה} לא חיי׳ נהילא חייש׳, תמחתא חייש׳, ניברא לא חייש׳‏ : (if it fell on:) ashes we do not worry, but if sifted, we worry; soft bark, we worry; palm fiber: we do not worry
See the entire entry for tymḥh n.f. soft bark

BT Ḥul 51b(39)var. :תמחתא חייש׳‏ : (if a bird fell on) a hard branch, we suspect (internal injury)
See the entire entry for tmḥtˀ n.m. hard fallen cuttings