Musk is the common ingredient in almost all kinds of musk oil. Musk was originally the perfumed compound derived from the musk pods found in the Musk deer. Musk deer were hunted on a large scale for this prized aromatic natural product, which has led to a significant dwindling of their population. Now, animal musk is replaced with synthetic musk. 
It probably contained a base oil, like rapeseed oil to keep all the ingredients well mixed. Besides, there might have been other ingredients too for their therapeutic properties. At present, the Egyptian musk oil is made using the original ingredients except for the Natural Musk. This is replaced either by plant sources which resemble musk, or by synthetic musk ( which is also called white musk ).