The spinal string is a long, slender, rounded structure comprised of sensory tissue, which stretches out from the medulla oblongata in the brainstem to the lumbar locale of the vertebral section. It encases the focal trench of the spinal string, which contains cerebrospinal liquid. The mind and spinal line together make up the focal sensory system (CNS). In people, the spinal string starts at the occipital bone, going through the foramen magnum and entering the spinal trench toward the start of the cervical vertebrae. The spinal line stretches out down to between the first and second lumbar vertebrae, where it closes. The encasing hard vertebral segment ensures the moderately shorter spinal rope. It is around 45 cm (18 in) in men and around 43 cm (17 in) long in ladies. The breadth of the spinal string ranges from 13 mm (1⁄2 in) in the cervical and lumbar areas to 6.4 mm (1⁄4 in) in the thoracic zone.