Type 1 (slow twitch) – these are small in size and can’t produce much force because their activation or ‘twitch’ speed is slow.Based on genetics (as well as environmental factors such as training history), human muscles are made up of 2 main categories of fibers: Bicep fiber type affects how you target it for muscle growth The long head attaches onto the supraglenoid tubercle of the scapula (another part of your scapula, behind where the short head attaches).īoth muscles then merge at the elbow to share a common insertion point. The short headof the biceps attaches onto your coracoid process (a bone up in your shoulder/scapula area). The two muscles that make up your upper arm have their own functions, but also synergistically. This is different from more multi-pennated muscles such as the rectus femoris and posterior delt. The muscle fibers run in practically a straight line from one end to the other. The biceps are what’re classed as a fusiform muscle. horizontal adduction (taking your arm away from your body when horizontal to the ground). shoulder flexion (bringing your arm out in front of your body) and 4. Your biceps also have secondary functions too.
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