What synergistic action often occurs with pronation?

Jan has a nerve injury that impaired her biceps. She turns her palm up with her elbow bent, what muscles are recruited?

When are the biceps weakest?

Tim is unscrewing a screw with his R hand, elbow flexed at 90 degrees, which muscle is most active?

You are minding your own business doing chin ups in your garage (for fun?) when the kid who lives across the street throws a baseball really hard but inaccurately (or super accurately?). It hits you on the lateral side of your elbow, just as you reach the lowest part of the pull up, and you scream (it hurts!). The injury is consistent with a _____ force, causing pain and damage primarily to the ________ collateral ligament.

You fall off your skateboard and break your fall by putting your hand out in front of you; you hit the ground, palm first. Unfortunately for you, your interosseous membrane was damaged in a previous skateboarding accident, and one of your forearm bones breaks, due to taking most of the force of hitting the ground up through to its joint with the humerus. Which bone is mostly likely to be broken?

Matilda can no longer pronate her arm due to median nerve injury. What combination of the following movements (select all) might she use to compensate?

What angle should the elbow joint be at for optimal MMT of the forearm flexors?

You haven't done a push up in YEARS. Dr. Buchman asks you to demo a pushup in class and you reluctantly agree. It takes a ton of effort. Of your elbow extensors, which one puts in most of the work, and isn't a quitter?