This is explained in more detail on the next page. However, the same is not true of how the spinal nerves are labeled, and back problems are often described by both the spinal segment and the nerve root that is affected. For example, the C1-C2 disc in the neck lies between the first and second vertebrae in the cervical spine, and the T1-T2 disc lies between the first and second vertebrae in the thoracic spine. Superficially, they resemble the anteaters of South America and other spiny mammals such as hedgehogs and porcupines. Anatomical diagrams illustrate the human nervous system, especially the brain and spinal cord. The spines are modified hairs and are made of keratin, the same fibrous protein that makes up fur, claws, nails, and horn sheaths in animals. The L4 vertebra and L5 vertebra, along with the disc in between them, make up the L4-L5 segmentÄiscs are always labeled for the vertebrae that they lie between, and this is consistent throughout the length of the spine - for the cervical, thoracic and lumbar spine. x-ray of lumbar spine and pelvis, showing 5 lumbar vertebrae, spinous processes, os coxa, symphysis pubis, sacroiliac joint, sacrum, hip joint and femur - lumbar spine anatomy stock pictures, royalty-free photos & images. It provides several important functions, including protection. The disc and vertebra above and below the disc comprise one segment of the spine - usually called a spinal level or spinal segment. The human spine is a complex anatomic structure that is the scaffolding for the entire body. The L5-S1 disc at the bottom of the spine lies between the L5 vertebra and the first bony segment at the top of the sacrum, which is sacral segment 1 (or S1).The thoracic spine as a whole is often called the 'T-Spine' for short. The number indicates the level of the thoracic spine in which the particular vertebra is located. The L4-L5 disc in the low back is between the L4 vertebrae and L5 vertebrae which make up the L4-L5 spinal segment. The thoracic spine is made up of 12 vertebrae, each referred to by T, with an identifying number appended to it. Abstract, Manuscript, Figures and Tables, Disclosure information and Affirmation of Authorship form, must be prepared as SEPARATE files the system requires.Each disc is named according to which two vertebral bodies it lies between. Spinal discs are located in between each of the vertebral bodies along the back bone and may also be referred to as an intervertebral disc, spinal disc, or disk. Spinal Discs are in Between Each Vertebra