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This looks like a misinterpretation. Because collarbone is the only horizontal long bone of the human body [1], it is the first to fracture when falling on the shoulder. Its fracture can affect many structures: The muscles involved in clavicle fractures include the deltoid, trapezius, subclavius, sternocleidomastoid, sternohyoid and pectoralis major ...


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It isn't just humans that have fused sacral vertebrae. Animals on the phylogenetic tree ranging from Squamata (lizards), to Aves (birds), to even Monotremata (egg-laying mammals) all have fused sacral vertebrae. The fused vertebrae can serve as a stronger, weight-baring structures for animals that do land locomotion, including humans. Any bones that have ...


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If you look at urological sites for female-to-male reconstructive surgery the procedures often involve significant skin/tissue grafts and/or prostheses. See, e.g. this interesting and somewhat graphic site. Penis enlargement (see this site) for cosmetic purposes often entails less drastic measures, such as detaching the ligaments that keep part of the shaft ...



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