- 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.
Best Answer: Realistically this battery will last around 3 hours as long as there is not heavy usage of the CPU or GPU. So as long as you are doing basic things like e-mail, web surfing, etc you should get decent life out of it. shall buy a new battery from Apple shop as I had a clone one which, whilst it charges fast (2 hours) loses charge in 10 to 20% steps when the Macbook is off (completely off). This means at the end of a session it will be, say, 60% charged and next time it goes on it may be down to 40% or less only 2 or 3 hours later.