What are the key features and structures that can be observed in a longitudinal section anatomy of the human body?

In a longitudinal section of the human body, key features and structures that can be observed include organs such as the heart, lungs, liver, and kidneys, as well as major blood vessels like the aorta and vena cava. Additionally, the spinal cord, vertebrae, and muscles can be seen in a longitudinal section, providing a detailed view of the internal anatomy of the body.