Related for Niddah 51:34
דא"ר פרנך אמר רבי יוחנן
<b><i>GEMARA</i></b>. Our Rabbis taught: The placenta in its first stage resembles a thread of the woof and in its final stage it resembles a lupine. It is hollow like a trumpet; and no placenta is smaller than a handbreadth. R. Simeon b. Gamaliel stated: The placenta resembles the craw of a hen<span class="x" onmousemove="('comment',' Lit., 'hens'. ');"><sup>31</sup></span>
Tosefta Rosh Hashanah (Lieberman)
If a horn was long and he shortened it, then it is fit. If he has scraped it inside or outside, it is good. Ha [a]he disguises it inside, it is useless ; [if he] has it [covered up] on the outside, then it is fit for purpose. Did [a]he disguise the mouthpiece or did he extended, even if [it happened] with [material] of the same kind, it is invalid. If it was punctured, and if [a]er [then] stopped it, even if [it was done] with [material] of the same kind, it is unsuitable if it prevents blowing; but if not, it is fit. If he has put two horns together and blown them, then when he has heard the sound of the inner one, he has done his duty; if he has heard the sound of the outside, then he has not fulfilled his duty. The size of the horn: that [d]er [bloa-ser] take it with his hand and blow kana
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