Definition: Acrotarsi refers to a section of the humerus (biceps) that lies in between the shoulder blade and the elbow joint. It is composed of six bones: Acronis, Schaumus, Muscles, Lateral acronis, Postacronis and Antacronis. The word acrotarsial can also be used to refer to a section of a limb that lies in between a shoulder joint and the elbow, such as the scapula, which is composed of four bones: Scaphoid bone, Deltoid bone, Lateral scapular region and Anterior scapula. The word acrotarsial can also refer to a section of a limb or structure that lies in between two adjacent bones. It is used for describing structures like the femur and tibia, which are composed of eight bones: Fibula bone, Calcaneum bone, Tibia bone, Calcaneal region, Tibia bone, Femur bone and Calcaneus bone. The word acrotarsial can also refer to a section of a limb that lies in between two adjacent vertebrae. It is used for describing structures like the atlas and iliac crest, which are composed of three bones: Atlas bone, Scoliosis region and Iliac crest bone.