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.

Norwich () is a city in Norfolk, England, about 100 miles (160 km) north-east of London. Located on the River Wensum, Norwich is the county town of Norfolk and traditionally seen as the chief city of East Anglia. Its population in 2019 was estimated at 197,212. The local authority for the city is Norwich City Council.

The site of modern Norwich was settled by the Anglo-Saxons between the 5th and 7th centuries, near the former Iceni capital and Roman town of Venta Icenorum. Norwich became fully established as a town in the 10th century and developed into a prominent centre for trade and commerce in East Anglia. Norwich Cathedral and Norwich Castle were founded soon after the Norman Conquest in 1066. Norwich was granted city status by Richard the Lionheart in 1194. The city greatly benefited from the wool trade throughout the Middle Ages and prospered as a port with the status of a staple port; until the 18th century, it was the second-largest city in England (after London).

Norwich’s fortunes declined with the advent of the Industrial Revolution and the rise of new industrial towns of the north. The city underwent de-industrialisation in the 19th century but remained a regional agricultural and manufacturing centre, with a prominent shoemaking industry. After the Second World War, Norwich gradually transitioned into a service-based economy. The University of East Anglia, established in 1963, is located on the outskirts of Norwich.