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Bautastein

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  1. I'm reading this anatomy book for artists, and there's a question that made me curious which probably a book for artists will not answer. I'm working on the skeleton now, and have just learned about the spine, and we're moving on to the upper limbs. Now, as I understand, the only bones connecting the arm bones (the humerus) to the rest of the skeleton, are the collar bones (clavicles), is that correct? I see there are the shoulder blades (scapulae) as well, but these do not seem to be connected to the rest of the skeleton, they are floating. Furthermore, the clavicles aren't really connected directly to the spine, but instead to the sternum, which is in turn connected to the spine via the ribs. Now, if this was the only thing holding our arms connected to the rest of our body/skeleton, then it surely looks like a flimsy construction! Also, when looking at closeup drawings of it, it looks like the clavicles aren't even "trying" to keep the humerus from falling down. The clavicles just seem to sit on top of the scapulae and humerus without anything to hold them up. But a weight lifter can lift up to 260 kg, that's four times my own weight, maybe three times an average male's weight. So clearly the construction can withstand a lot of downwards force. So, I haven't gotten to the muscles yet. Is it the muscles on top of our shoulders (I don't even know what they're called) that holds the whole thing up, even when we're not flexing them? How does this construction really work?
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