- 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.
Different manufacturers have different ways to describe their laptop batteriesâ life expectancies. However, no one really gives an exact length of time that a battery should survive. What most manufacturers will say is when the battery will start losing about 80 percent of its capacity. Some use battery cycles while others just give a number of years. For most lithium-ion laptop batteries, the time it takes for them to lose 80 percent capacity is one to two years. For manufacturers that use cycles, itâs a little more complicated. One cycle is consumed each time a laptop battery is charged or discharged.