What anatomical structure is the opening that allows spinal cord to pass from brain rest of body?

The anatomical structure that allows the spinal cord to pass from the brain to the rest of the body is called the foramen magnum. It is a large, oval opening at the base of the skull, formed by the occipital bone. The foramen magnum allows the passage of the medulla oblongata, which is the continuation of the spinal cord into the brainstem and it also allows the passage of blood vessels, nerves, and cerebrospinal fluid.