ANATOMY & PHYSIOLOGY A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site biceps Biceps and triceps muscles in the upper arm. Left: biceps contracted. Right: triceps contracted Either of two muscles that are split in two in their upper part to form a Y-shape. Biceps brachii is the chief upper arm muscle; it runs along the humerus – the large bone of the upper arm – and is connected to the radius at one end and the scapula, or shoulder-blade, at the other. Contraction of the biceps causes the arm to flex at the elbow joint. It works antagonistically with the triceps, which contracts to extend the arm (see antagonist). Biceps femoris is a thigh muscle, attached to the pelvis, the femur, and the fibula. Related entry    • skeletal muscles and muscle groups Related category    • ANATOMY AND PHYSIOLOGY Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP