- long head: infraglenoid tubercle of scapula to olecranon process. functions in joint stability (shunt muscle) - medial head: dorsal surface of humerus to olecranon process.most active of the head in all three positions.- lateral head: dorsal surface of humerus to olecranon process.Strongest, but only active against resistance.unctions in joint stability (shunt muscle) - medial head: dorsal surface of humerus to olecranon process. most active of the head in all three positions. - lateral head: dorsal surface of humerus to olecranon process. Strongest, but only active against resistance.
The ES 500 is a great little backup unit. Easy to use, long battery life (about 25 min. with a desktop PC plugged in; 2 hrs. with a notebook PC plugged into it). It includes full surge protector capabilities, so you won't need to buy another one of those.
How long should my laptop battery stay charged? I have an Acer Aspire 5315 computer, purchased Christmas '07. I use it mainly at my desk, so it is plugged and charging almost constantly. However, when I unplug it I get about 15 minutes before it starts beeping at me to recharge. Is this normal? Seems a bit pointless for a mobile device. Also, if it is a problem with the battery, is this sort of thing usually covered under warranty? Thanks.