E. Bones/horns/hooves/skin/placenta:[1]

One who cooks the following body parts of an animal with milk is exempt from Biblical liability:

1) placenta [i.e. Shilya]; 2) skin[2] 3) sinews; 4) bones [whether soft or hard[3]] 5) horns; 6) hooves. Likewise, one who eats them with milk is exempt from Biblical liability.[4] Nevertheless, it is [Rabbinically[5]] forbidden to cook or eat these items with milk.[6] [Thus, if any of these items fall into

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[1] Michaber 87:7; Chulin 114a

[2] Soft skin: Some Poskim question as to whether the above Biblical exemption applies even to the soft skin found in certain areas of the animal, such as the skin of the genitals, the skin of a fetus, and the skin under the tail, or if these skins are under a Biblical cooking and eating prohibition with milk. [P”M 87 S.D. 22; Machazik Bracha 87:27; Pischeiy Teshuvah 87:15; Zivcheiy Tzedek 87:51; Kaf Hachaim 87:68]

[3] P”M 87 S.D. 22; Machazik Bracha 87:28; Pischeiy Teshuvah 87:15; Zivcheiy Tzedek 87:52; Kaf Hachaim 87:69-70

The novelty: Although we rule that the hard bones of a non-Kosher animal do not require 60x if they fall in a food [See Michaber 99:1; Taz 99:1], nevertheless there is a Rabbinical decree against cooking them with milk.

Other opinions: Some Poskim rule that only the soft bones are Rabbinically forbidden, while the hard bones do not contain even a Rabbinical prohibition. [Minchas Yaakov in Shut in end of Toras Chatas 16; See Beis Lechem Yehuda Shut 99, brought in Pischeiy Teshuvah 87:15]

The bone marrow: Bone marrow is under a Biblical prohibition of meat and milk. [Michaber 99:1; See Minchas Yaakov in Shut in end of Toras Chatas 16; Beis Lechem Yehuda Shut 99, brought in Pischeiy Teshuvah 87:15; P”M 87 S.D. 22; Machazik Bracha 87:28-29; Kaf Hachaim 87:70]

[4] Michaber ibid

[5] P”M 87 S.D. 22; Kaf Hachaim 87:69

[6] Shach 87:22; Beir Heiytiv 87:19; Peri Chadash 87:120; Lechem Hapanim 87:14; Beis Lechem Yehuda 87:14; Halacha Pesuka 87:6; P”M 87 S.D. 22; Chochmas Adam 40:6; Beis Yitzchak 87:9; Yad Yehuda 87:35; Zivcheiy Tzedek 87:49; Aruch Hashulchan 89:29; Kaf Hachaim 87:66

The reason it is forbidden to cook: It is implied from the Poskim ibid that these items contain an actual Rabbinical prohibition to be cooked with milk, and not just Maaras Ayin, as does poultry and wild animal meat. Seemingly, the reason for this is because any product which comes from an animal which its meat has a Biblical prohibition of Basar Bechalav, the Sages gave it a Rabbinical prohibition for all matters including cooking. Vetzaruch Iyun