The L1 vertebrae is the first vertebra that is in the lumbar spine, and is located in your lower back.
The L1 vertebrae is also known as the lumbar vertebra 1.
L1 vertebrae is situated below your thoracic spine (T12 vertebra) and above your L2 vertebra.
Your lumbar vertebrae, known as L1 to L5, are the largest of your entire spine. Your lumbar spine is located below your 12 chest (thoracic).
The L1 vertebrae is a cylindrical shaped bone with a large, rectangular vertebral body which supports weight.
It also has two transverse processes which extend sideways and a spinous process which also projects backwards.
And it also has superior and also inferior articular processes which form joints with the adjacent vertebrae.
The function of your L1 vertebra provide structural support for the lower back and helps to absorb shock and allows for movement, like bending and twisting and it also protects your spinal cords that pass through your lumbar spine.
Your L1 vertebra is a common site for spinal injuries, like fractures and dislocations and any damage to the L1 vertebra can affect your mobility, sensation and even bowel and bladder function.