אבן העזר ה׳Even HaEzer 5

Se’if 1א׳

פְּצוּעַ דַּכָּא וּכְרוּת שָׁפְכָה אֲסוּרִים לִשָּׂא יִשְׂרְאֵלִית וּמֻתָּרִים בְּגִיּוֹרֶת וּמְשֻׁחְרֶרֶת. וַאֲפִלּוּ כֹּהֵן שֶׁהוּא פְּצוּעַ דַּכָּא מֻתָּר לִשָּׂא גִּיּוֹרֶת וּמְשֻׁחְרֶרֶת, לְפִי שֶׁאֵינוֹ בִּקְדֻשָּׁתוֹ. וַאֲפִלּוּ נְתִינָה אוֹ אַחַד מֵהַסְפֵקוֹת מֻתֶּרֶת לוֹ, הוֹאִיל וּפְצוּעַ דַּכָּא אָסוּר לָבֹא בַּקָּהָל לֹא גָּזְרוּ בּוֹ עַל הַנְּתִינִים וְלֹא עַל הַסְפֵקוֹת. אֲבָל אָסוּר בְּמַמְזֶרֶת וַדָּאִית, שֶׁהֲרֵי אֲסוּרָה מִן הַתּוֹרָה. וְיֵשׁ מַתִּירִים אֲפִלּוּ בְּמַמְזֶרֶת (טוּר וְהָרַאֲבַ"ד וְהָרַשְׁבָּ"א):

A petzua daka (a man with crushed or seriously damaged testicles) and a krus shafcha (a man whose urethra or seminal canal has been cut or severed, impairing ejaculation) are prohibited to marry a jewess, and permitted with a convertess and a freedwoman. And even a priest who is a petzua daka is permitted to marry a convertess and a freedwoman, since he is not in his sanctity. And even a nesina or one of the questionables are permitted to him; since a petzua daka is forbidden to enter the congregation, they did not decree on him regarding nesin's nor regarding questionables. However, he is forbidden in an unquestionable bastardess, for behold she is forbidden from the Torah. And some permit even a bastardess. (Tur, and Raavad, and Rashba)

Se’if 2ב׳

אֵיזֶהוּ פְּצוּעַ דַּכָּא, כָּל שֶׁנִּפְצְעוּ הַבֵּיצִים שֶׁלּוֹ. וּכְרוּת שָׁפְכָה, כָּל שֶׁנִּכְרַת הַגִּיד שֶׁלּוֹ. וּבִשְׁלשָׁה אֵבָרִים אֶפְשָׁר שֶׁיִּפָּסֵל הַזָּכָר: בַּגִּיד, וּבַבֵּיצִים, וּבַשְּׁבִילִים שֶׁבָּהֶם נִתְבַּשֵּׁל שִׁכְבַת זֶרַע, וְהֵם הַנִּקְרָאִים חוּטֵי בֵּיצִים. וְכֵיוָן שֶׁנִּפְצַע אֶחָד מִשְּׁלשָׁה אֵבָרִים אֵלּוּ אוֹ נִכְרַת אוֹ נִדַּךְ, הֲרֵי זֶה פָּסוּל. כֵּיצַד, נִפְצַע הַגִּיד אוֹ נִדַּךְ, אוֹ שֶׁנִּכְרְתָה הָעֲטָרָה אוֹ לְמַעְלָה מֵהָעֲטָרָה, פָּסוּל. וְאִם נִכְרַת מֵרֹאשׁ הָעֲטָרָה וְנִשְׁתַּיֵּר מִמֶּנָּה אֲפִלּוּ כְּחוּט הַשַּׂעֲרָה מֻקָּף לְכָל הַגִּיד, כָּשֵׁר:

What is a petzua daka? Someone whose testicles are wounded. And a krus shofchoh, all that his penis is severed. And with three limbs it is possible that a male will become invalid: in the penis, and in the testicles, and in the paths within which the semen is prepared and they are what is called cords [of the] testicles. And when one of these three limbs is wounded or severed or crushed, behold he is invalid. For example, if the penis is wounded or crushed, or the glans is severed or above the glans [is severed], [he is] invalid. And if there is severed from the glans and there is left even as much as a hair's breadth encompassing the entire penis, [he is] kosher.

Se’if 3ג׳

נֶחְתַּךְ מֵהַגִּיד לְמַעְלָה מֵעֲטָרָה בְּשִׁפּוּעַ כְּקוּלְמוּס, כָּשֵׁר. כְּמַרְזֵב, שֶׁנִּטַּל חֲלָלוֹ שֶׁל גִּיד וְנִשְׁאֲרוּ הַדְּפָנוֹת, לרַשִׁ"י וְהָרֹא"שׁ, פָּסוּל. לְהָרַמְבַּ"ם כָּשֵׁר:

If someone cut from the tendon above from the crown in the shap of a kulmus, it is kosher. Like a marzev, that took the vacant [part of] of the tendon and left the left side, [if cut so] [according to] Rashi and the Rosh, pasul. [According to] the Rambam, kosher.