Having mentioned the pieces, why does the Torah see fit to mentions the head independently?
Rashi #1: To incorporate it in the burning. 1
Rashi #2 (Chulin, 90a): To teach to bring it on the Mizbe'ach whole.
Moshav Zekenim: Since both Simanim were cut during Shechitah, [even if it is attached] it is as if it is detached. It is not flayed, for a verse teaches that it is offered with the wool on it, or a goat's beard. Since the Torah needed to include it, this teaches that it is severed from the body. From this we infer that Shechitah is at the neck (Chulin 27a) 2 .
What exactly is the 'Peder'?
Ramban #1 (citing Targum Onkelos and other commentaries) and Rashbam: It is [all] the Chelev (intestinal fats) 1 .
Ramban #2 and Targum Yonasan: It is the thin layer of fat 2 that divides between the upper and lower innards. Peder is like Pered (divides).
Why is the Peder mentioned separately?
Rashi and Ramban: Because its function was to cover the Beis-ha'Shechitah. 1
Out of respect for Hashem
What is the Torah see fit to add "asher al ha'Mizbe'ach"?
Rashi: To teach that the logs of wood may not protrude from the Ma'arachah.
The Kohen must stand on the Mizbe'ach [in order to arrange the wood, according to the opinion that] it was 10 Amos tall. It was covered with copper. If metal is hot due to the fire, all is hot; his feet would be scalded!
Moshav Zekenim: Fire of Shamayim does not jump to and fro; it is only where it is needed. We find that the burning bush was not consumed. 1 Even though we must also bring human fire, the Torah did not command to harm oneself (also the human fire will not damage).
This explains the answer of R. Eliezer and R. Yehoshua (Yerushalmi Chagigah 2:1). Avuyah exclaimed to them, 'did you come to burn my house?!' They answered, we were engaging in Torah
Which wood may be used for the Ma'arachah?