Arms/Hands in Sun Salutations

A query:

Anyone know why there are the different hand and arm variations in the Sun Salutations A and B? For example, I sometimes see people swan dive arms out to the side as they come into a forward fold. Sometimes I see hands coming down through heart center in a forward fold. Some folks, upon rising, bring the arms above head, and immediately go into a forward fold from there. Others bring arms overhead, back through heart center, and then back again over head before coming in a forward fold. There are also different hand variations in Urdhva Hastasana (Upward Hand Posture). Steeple fingers, palms together, etc. I'm guessing it's mudra related, but I just don't know.

Any ideas about the variations of the arms and hands? Lineage? Or just preference?


Thanks!