Arm Protection

[Oisin]

Hello all,

I've seen a number of depictions in pop culture of Romans wearing lorica segmentata (or segmentata-ish) shoulders over another type of cuirasse, usually a musculata. Is there any precedent in history for this, or is this just another Hollywood inaccuracy? Best depiction is in Gladiator (I know, not safe for sanity), but I've seen it other places as well (including SCA impressions), but never in a reputable source. Is this just me missing the right pictures, or is this because it's not correct?

Like this: http://mgeisler.net/images/gladiator_emperor.jpg

If so, besides the manica and any possible protective value of pteruges, what sorts of arm armour might have been used by the Roman army during different periods? I saw one reinactor's essay on the internet mentioning that he wasn't qualified to comment on leather arm protection, which would imply that this exists as well. Does it?

Thanks for the help.