Blast Your Biceps
The biceps brachii, the familiar muscle on the upper arm that flexes and supinates the forearm Two instances of the fusiform muscle model are used to represent the biceps brachii (see Figure 11). We define two functions for specifying the muscle's attachments and one for instantiating the muscle. Notice that the biceps brachii is a multi-joint muscle. It originates from the scapula, spans over the shoulder, elbow, and ra-dioulnar joints, and inserts into the radius bone. Therefore, when specifying the attachments of the muscle in the hierarchy, the origin function must be called just after creating the scapula, and the insertion function must be called just after creating the radius. This ensures that the origin and insertion points will be transformed together with their underlying parts the scapula in case of the origin, and the radius in case of the insertion. Another action performed by the biceps brachii is supination of the forearm, an action that is most powerful when the elbow...
The movement of the hand reflects itself as far as the shoulder, through the biceps muscle, which aids in turning the radius. In all movement but turning, the wrist can act alone. Turning, to nearly two right angles, is carried out by the radius. Further movement of any kind must be performed by elbow or shoulder.
We tested the muscle models on a variety of superficial and middle-layer muscles 8 that are responsible for joint movement in the upper limb. Figure 17 presents back and side views of some of these muscles. Notice how the general muscle model is used very successfully to model large muscles such as the trapezius and the latissimus dorsi. We also tested the deformation characteristics of the muscle models by creating an animation sequence to show how the biceps brachii muscle bulges when the forearm is flexed at the elbow joint. Selected frames of the animation sequence are shown in Figure 18.
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