I am currently a medical student. I wanted to ask that aince we do study on human bones, do I have to do ghusil e masse-maiyat? if I am touching them with bare hands?

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If touching with bear hand then ghusl is wajib.

Ruling 510. If someone touches – i.e. makes part of his body come into contact with – the body of a dead person after it has become cold but before it has been given ghusl, he must perform the ghusl for touching a corpse, irrespective of whether he touches it while he is asleep or awake, voluntarily or involuntarily. Even if one’s nail or bone touches a nail or bone of the corpse, he must perform this ghusl. However, if one touches a dead animal, then performing ghusl is not obligatory on him.