1. Such an accident can drive the mandibular condyles through the temporal bone into the auditory canal. Upon looking into the auditory canal, a physician therefore may be able to see through the broken bone into the pharynx.

2. High-heeled shoes raise the human foot into a position comparable to a dog's or cat's foot, with the heel off the ground and the body weight thrown forward onto the heads of the metatarsals. However, a dog or cat supports all its weight this way, whereas a person in high-heeled shoes still supports much of the weight on the calcaneus and heel of the shoe.

3. In both the wrist and foot, the distal row consists of four short bones, although there are no similarities in their names: the hamate, capitate, trapezoid, and trapezium in the wrist, and the first through third cuneiforms and the cuboid in the foot. In the proximal row, the wrist and foot are much different, although both of them have a navicular bone. The wrist has four bones in the proximal row–the navicular, lunate, triquetral, and pisiform. The foot has three–the navicular, talus, and calcaneus–although they do not form a transverse row like the carpal bones.

4. The ilium and sternum both contain red bone marrow in adults, and both of them come close to the body surface, so they are quite accessible. Red bone marrow could not be obtained from the long bones (which are filled with yellow marrow), and it would be more difficult and risky to obtain it from deeper bones such as the vertebrae.

5. Among other possible errors, the boy probably placed his hands too low on the sternum. Compressions in this area can push the xiphoid process into the liver and cause the liver to hemorrhage.

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