Answer
Medical students should observe and dissect multiple cadavers in order to see as many different body types as different. Some humans are missing organs, some have certain muscles others do not as well as varying numbers of lumbar vertebrae. The diagrams represented within the textbooks represent around 70% of the human bodies.
Work Step by Step
"Anatomists, surgeons, and students must be constantly aware of how much one body can differ from another." (p.14)