Siman 62
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א אֵבֶר מִן הַחַי אָסוּר בִּבְהֵמָה, חַיָּה וָעוֹף.
1 A limb from a live animal is forbidden from a domesticated animal, a wild animal, or fowl.
ב אֵבֶר הַפּוֹרֵשׁ מִן הַחַי, אָסוּר, וּבָשָׂר הַפּוֹרֵשׁ מִן הַחַי אָסוּר, מִשּׁוּם וּבָשָׂר בַּשָּׂדֶה טְרֵפָה (שְׁמוֹת כב, ל) וְאֲפִלּוּ הַפּוֹרֵשׁ מֵהַבְּהֵמָה וַעֲדַיִן הוּא בְּתוֹכָהּ, כְּגוֹן שֶׁנֶּחְתַּךְ מֵהַטְּחוֹל אוֹ מֵהַכְּלָיוֹת וְנִשְׁאֲרָה הַחֲתִיכָה בְּתוֹכָהּ, אָסוּר.
2 A limb that separates from a live animal is forbidden. And flesh that separates from a live animal is forbidden because of "And the flesh in the field Treifah." And even what separates from the animal [but] is still inside it - such as [where it was] cut from the spleen or from the kidneys and the piece was left inside it - it is forbidden.
ג אֵבֶר אוֹ בָּשָׂר הַמְדֻלְדָּלִים, אִם אֵינוֹ יָכוֹל לַחֲזֹר וְלִחְיוֹת, אֲפִלּוּ אִם לֹא פֵּרַשׁ מִמֶּנּוּ עַד לְאַחַר שְׁחִיטָה, אָסוּר. הַגָּה: וְעַיֵּן לְעֵיל סִימָן נ"ה. יַתֶּרֶת הָעוֹמֶדֶת בְּמָקוֹם שֶׁאֵינוֹ מַטְרִיף הַבְּהֵמָה, מֻתָּר לְאָכְלָהּ, וְלֹא אָמְרִינַן יָתֵר כְּנָטוּל דָּמִי וְהָוֵי כְּאֵבֶר הַמְּדֻלְדָּל (א"ו הָאָרֹךְ) אֵבֶר הַנִּשְׁמָט מִמְּקוֹמוֹ בְּמָקוֹם שֶׁאֵינוֹ מַטְרִיף הַבְּהֵמָה, מֻתָּר לְאָכְלוֹ, אַף אִם אֵין עוֹר וּבָשָׂר חוֹפִין רֻבּוֹ (רַשְׁבָּ"א סי' פ"ט) אֲבָל הַמִּנְהָג לְהַחְמִיר גַּם בָּזֶה (א"ו הָאָרֹךְ).
3 A limb or flesh that is minced (Injured) and can not be reattached back into the animal, even if it was separated after the shechita, It is forbidden (to eat it). Rema: in Siman 55 states, the Yeteret (an extra piece of meat on the animal that does not cause the animal to no longer be considered kosher) is still on the animal. The animal is still kosher. Additionally, we do not say that a removed Yeter is considered like a minced limb (and forbidden). The Yeter can even be eaten. Nevertheless, the Rashba (שו"ת הרשב"א חלק א סימן פט) says that the minhag (tradition) is to be stringent (and not eat the Yeter meat).
ד בֵּיצֵי זָכָר שֶׁנִּתְלְשׁוּ וַעֲדַיִן הֵם מְעֹרִים בְּכִיסָם, אֵינוֹ אָסוּר מִן הַתּוֹרָה, שֶׁהֲרֵי יֵשׁ בּוֹ מִקְצָת חַיּוּת, וּלְפִיכָךְ אֵינוֹ מַסְרִיחַ, וְאַף עַל פִּי כֵן אָסוּר לְאָכְלוֹ מִמִּנְהָג שֶׁנָּהֲגוּ יִשְׂרָאֵל שֶׁלֹּא לְאָכְלוֹ, מִפְּנֵי שֶׁדּוֹמֶה לְאֵבֶר מִן הַחַי.
4 An animal's male organ that has been detached but is still covered (the flesh and skin still covers the organ), is not forbidden by the Torah, because the organ is not considered without life (not considered dead tissue) and has not rotted. Even though this organ is not forbidden to eat, the minhag (tradition) of (Klal) Yisrael is not to eat it because it looks like a limb from a live animal.