The fact is, there is a precise width of lane that must exist for cyclists to operate their vehicles safely, and it's not the 4ft standard width bike lane, nor is it the 6ft standard width bike path, nor is it the 14ft wide outside lane.
The foramen magnum (Latin: great hole) is a large opening in the occipital bone of the human skull. It is one of the several oval or circular openings (foramina) in the base of the skull.The spinal cord, an extension of the medulla, passes through the foramen magnum as it exits the cranial vault.he opisthion is the midpoint on the posterior margin of the foramen magnum and is a cephalometric landmark. Another landmark is the basion located at the midpoint on the anterior margin of the foramen magnum. The foramen magnum is a very important feature in bipedal mammals.
foramen magnum. noun foramen magÂ·num \-Ëmag-nÉm\. : the opening in the skull through which the spinal cord passes to become the medulla oblongata.See foramen magnum defined for kids. ADVERTISEMENT. the opening in the skull through which the spinal cord passes to become the medulla oblongata. See foramen magnum defined for kids. ADVERTISEMENT.