The largest intervertebral disc is typically found between the fourth and fifth lumbar vertebrae in the lower back. This disc is known as the L4-L5 disc and tends to be larger due to the increased weight-bearing and range of motion demands placed on the lower back.
The vertebrae in the lower back are called the Lumbar vertebrae. They are L1, L2, L3, L4 and L5.
The largest unfused vertebrae is your Lumbar, located in your lower back.
At the level of the third and fourth lumbar vertebrae, in the small of the back.
myelography
The L2-L3 vertebrae are located in the lower back, specifically in the lumbar region. They are the second and third vertebrae from the top of the lumbar spine, just below the L1-L2 vertebrae and above the L3-L4 vertebrae.
The lumbar vertebrae are the largest because they need to be able to support more weight.
What the radiology report indicates is that you've got a herniated disk at the L4/5 vertebrae, which is pressing forward into the spinal cord passageway. The foramen is the narrow passage in the vertebrae where the spinal cord runs through.
L5 is the largest vertebrae. Although the body of L4 looks larger, the increased height of L5 makes it larger overall. Found this info from "The Anatomy and Biology of the Human Skeleton" by D Gentry Steele and Claud Bramblett
The Blue Whale is the largest vertebrate animal.
lumbar: L1,L2,L3,L4,L5 sacrum coccyx
Vertebrae