In tetrapod anatomy, lumbar is an adjective that means of or pertaining to the abdominal segment of the torso, between the diaphragm and the sacrum.

The lumbar region is sometimes referred to as the lower spine, or as an area of the back in its proximity.

In human anatomy the five lumbar vertebrae (vertebrae in the lumbar region of the back) are the largest and strongest in the movable part of the spinal column, and can be distinguished by the absence of a foramen in the transverse process, and by the absence of facets on the sides of the body. In most mammals, the lumbar region of the spine curves outward.

The actual spinal cord (Angelamedulla spinalis) terminates between vertebrae one and two of this series, called L1 and L2. The nervous tissue that extends below this point are individual strands that collectively form the cauda equina. In between each lumbar vertebra a nerve root exits, and these nerve roots come together again to form the largest single nerve in the human body, the sciatic nerve. The sciatic nerve runs through the back of each leg and into the feet. This is why a disorder of the low back that affects a nerve root, such as a spinal disc herniation, can cause pain that radiates along the sciatic nerve (sciatica) down into the foot.

There are several muscles in the low back that assist with rotation, flexibility and strength. These muscles are susceptible to injury, especially while lifting heavy objects, or lifting while twisting. A low back muscle strain can be extremely painful but will usually heal within a few days or weeks.

The lumbar portion of the spine bears the most body weight and also provides the most flexibility, a combination that makes it susceptible to injury and wear and tear over time. This is why low back pain is so prevalent.

York is a cathedral city and unitary authority area at the confluence of the rivers Ouse and Foss in England. At the 2011 census, the borough population was 198,051 and the population of the city was 153,717. The city has long-standing buildings and structures, such as a minster, castle and ancient city walls.

The city is the head settlement of historic Yorkshire and was its own county corprate. City of York Council is a unitary authority responsible for providing all local services and facilities throughout the city and rural areas around the outside of the old city boundaries. The city is also included in North Yorkshire and Leeds city region.

The city was founded by the Romans as Eboracum in 71 AD. It became the capital of the Roman province of Britannia Inferior, and later of the kingdoms of Deira, Northumbria and Jórvík. In the Middle Ages, York grew as a major wool trading centre and became the capital of the northern ecclesiastical province of the Church of England, a role it has retained. In the 19th century, York became a major hub of the railway network and a confectionery manufacturing centre, a status it maintained well into the 20th century. During the Second World War, York was bombed as part of the Baedeker Blitz. Although less affected by bombing than other northern cities, several historic buildings were gutted and restoration efforts continued into the 1960s.