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I love to hunt ducks, cook them and have a party with my hunter friends.
When getting breast meat from duck, we will see big muscle (pectoralis)
and tender (supracoracoideus) under it.
To pick big part, it needs knife to tear it away from keel bone.
But it is no need to pick tender.
I thought muscle attaches to bones at both ends. But tender
connected to only wing side and no bond to keel.
I have read some bird anatomy documents but could not find the reason so far.
Last edited on Wed Dec 23rd, 2015 06:15 AM by tomo
Usually I don't hang ducks. There are not good place to do so.
(I mean no cool place here)
I dissect them soon after getting back home. So I don't think it decomposed.
I thought that muscles, which moves bones, need to connected its both ends
to bones if it works powerfully. Big breast muscle does so.
It makes wings down strongly and connect its both ends to bone. it makes sense.
But tender which makes wings up and one end almost free (no connection
to bone at lower side).
Here is my hypothesis. Bird does not need so much power when they
make their wings up. And tender could retain its place because
other big muscle (pectoralis) , which makes wing down, covers it nicely.
it might have something to do with landing or taking off too where the wing angles are different than in flight.
the big muscle could be contracting around the smaller muscle allowing extra strength [and dexterity] during those critical times.
and it's just sliding around in there not burning calories the rest of the time.
I asked a professor at a university of veterinary medicine this question.
And he answered me that tender is connected to the bone.
But that muscle is far smaller than outer muscle, which make wings down,
and could be removed from the bone easier if pull them to tail.
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It is really neat how those muscles work. The big muscle is for the wing down stroke. Birds evolved the large keel to serve as an origin point for the large muscle needed to accomplish that stroke. The small muscle is for the up stroke of the wing. The really neat part is that that muscle needs to be below the bird to keep weight below the wing surface for balance. The tendon from that muscle wraps around a bone that acts as a pulley and pulls up on an insertion point on top of the wing. It needs less force, therefore, a smaller origin for that muscle. It should be attached to a small portion of the keel and breast bone. Because of the relatively small force needed for the upstroke, there was no evolutionary need to develop strong (heavy) attachment tissue for that muscle. I will always remember that ornithology class back in college. We learned those muscles using a grocery store rotisserie chicken; kind of learn and snack at the same time.