The structural commonality of the biceps brachii and the rectus abdominis is that they are parallel muscles whose fibers run along through the long axis of the body.
Together with the pyramidalis muscle, the rectus abdominis is a member of the anterior abdominal muscles. However, when considering the functional architecture, these two muscles, together with the three lateral abdominal muscles—the external oblique, internal oblique, and transversus abdominis make up the anterolateral abdominal wall.
The biceps brachii muscle, also known as the "biceps," is a big, thick arm muscle with two heads. The supraglenoid tubercle, located above the glenoid cavity of the scapula, is the location of the long head. It is extra synovial while being in the intracapsular area.
At the humeral head, the long biceps tendon curves sharply before continuing on in the bicipital groove (intertubercular sulcus). Ligaments in the capsular region (also known as the biceps pulley) hold this pivotal point in place.
Short head: Arises at the coracoid process of the scapula, where it partially fuses with the coracobrachialis origin tendon.
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