The measured signal can be interpreted in other ways. One of the common ways of interpreting the signal relies on having signals from two muscles in an agonist-antagonist configuration. For example, in the case of an above-elbow amputation, signals from the biceps muscle remnant and from a triceps muscle remnant can be used together to infer something about the intended movement of the limb. In particular, it is common practice to first rectify and average the individual signals and then use the difference between the signal amplitudes as the control input. Specifically, a large difference in the signals implies a large joint velocity, and a small difference implies a small joint velocity. Care is taken to ensure that a dead zone exists so that neural activity below a certain threshold does not result in any motion.
The elbow is a hinge joint between the humerus (upper arm bone) and the ulna and radius. The elbow allows you to bend and straighten your arm and to rotate your forearm without moving your upper arm. Your biceps muscle bends the forearm, while your triceps muscle straightens the forearm. The bony projection that forms the point of the elbow is the olecranon. Popularly known as the funny bone, because bumping the nerve (the ulnar nerve) that passes over it produces a familiar tingling sensation, the olecranon prevents overextension of the elbow.
Fig. 12.38A, B Old myositis ossificans traumatica. A Lateral radiograph of the right elbow in a 15-year-old boy with myositis ossificans of the biceps muscle shows fusiform ossification in the antecubital fossa (open arrow). Fracture had occurred 9 months previously. The proximal ulna and distal humerus are the sites of old fractures with deformity and osteophytes (arrowheads). B Lateral pinhole scan shows mild tracer uptake in myositis (open arrow). Note marked tracer uptake in fractures and osteophytes (arrowheads) The musculotendinous unit is the portion of a muscle attached to a tendon, tendinous insertion, or enthesis, and strain is defined as a stretching or tearing of the musculotendinous unit (Baker 1984). According to the nature and extent of damage a strain can be graded as first, second, or third degree. The first grade indicates minimal stretching of the musculotendinous unit without permanent injury, the second grade partial tearing, and the third grade complete...
31 Days To Bigger Arms
You can have significantly bigger arms in only 31 days. How much bigger? That depends on a lot of factors. You werent able to select your parents so youre stuck with your genetic potential to build muscles. You may have a good potential or you may be like may of the rest of us who have averages Potential. Download this great free ebook and start learns how to build your muscles up.