Patella present in the living monotremes, the platypus and the echidna. In more primitive tetrapods, including living amphibians and most reptiles (except some Lepidosaurs), the muscle tendons from the upper leg are attached directly to the tibia, and a patella is not present. In 2017 it was discovered that frogs have kneecaps, contrary to what was thought. This raises the possibility that the kneecap arose 400 million years ago when tetrapods first appeared, but that it disappeared in some animals. The word "patella" originated in the late 17th century from the diminutive form of Latin ' or ' or "paten", meaning
History of beliefs about the human body manuscript is recorded in the Yellow Emperors Inner Cannon, and it being recorded in this way represents the attention to the individuals perspective in creating therapies like acupuncture to treat body ailments. The Inner Cannon was revised by natural Philosophers of the time and the approved version of the Han Court and became a foundational text for the ideals and perceptions of the human body. It focused on Qi, Yin and Yang balance, and Five phase theory to explain health can disease. Referred to as the life force of the body, or the means by which the body is able