Now we all know that if you want to be ultracorrect, according to its neo-Latin etimology, "centimeter" should be pronounced with the accent on the "i". Similarly, "millImeter," "kilOmeter," "pentAmeter," "odOmeter," etc.
In Old English, all words were stressed on the first syllable... it's our historical default. So a lot of Latin words (especially nouns and adjectives) end up being stressed on the first syllable in English, even when it would be impossible in Latin to put the stress there.
Umbilicus -- in Latin, the second "i" is long, and should, therefore be stressed.
Oblique -- this is a French word. The eeks have it here over the ikes, historically.
Skeletal -- sorry, the accent is on the final syllable if you're latinate. On the initial syllable if you want to be traditionally English. There's no excuse for putting the stress on the second "e."
[This post, though factually correct, is presented here lingua-in-buccam. I think prescriptive linguistics is arrogant, myself.]
By the way, how do you pronounce "vuitamin"?