Right or Left Bones? Clavicle Ulna . Together, the clavicles make a . Lay the ulna on the table. “handlebar” shape (low at the middle . Can you see the radial notch? of the chest, higher near the shoulders). o If yes, the open side of the . The blunt tip (sternal end) touches the trochlear (semilunar) notch tells sternum at the middle of the chest. you the bone orientation (see . The round tip (acromial end) touches the photo 1). scapula at the shoulder. o If no, the open side of the . The bumpy side of the clavicle faces the trochlear (semilunar) notch is the rib cage. opposite of the bone orientation . The smooth side of the clavicle faces (see photo 2). outward Radius Fibula . The styloid process always touches the . The smoother tip (head of the fibula) thumb. touches the knee. If the lower end of the radius (near the . The rougher tip (lateral malleolus) styloid process) is rough, you are touches the ankle. looking at the back of the wrist. The point of the lateral malleolus points . If the lower end of the radius is smooth, to the pinkie toe, not the middle of the you are looking at the inside of the wrist. foot. The front of the fibula (anterior view) has an edge. The back of the fibula (posterior view) is flat. References: University of Liverpool Faculty of Health and Life Sciences. (2013). Radius and ulna (right forearm) [Digital photograph]. Retrieved from https://www.flickr.com/photos/liverpoolhls/10819145494. .