The bicep has two heads (hence the prefix “bi”). The two heads are the long head and the short head. However, there is an additional muscle, the brachialis, which technically is not part of the bicep but contributes to the overall development of your biceps.The short head is the inner part of the bicep. Spider curls are a great, often forgotten exercise, to hit it. The long head is the outside of the bicep and can be targeted effectively with barbell curls.The brachialis is a distinct muscle fro