What landmark is associated with the L3-4 vertebrae?

The umbilicus, or belly button, is located at the anatomical level approximately corresponding to the L3-L4 intervertebral space in adults. This positioning is significant in understanding the relationship between surface anatomy and spinal landmarks, which is crucial for various medical assessments and procedures.

The L3-L4 vertebrae are part of the lumbar region, and their alignment is often used as a reference point for locating other structures in the area. As the umbilicus is generally situated near this lumbar level, it can serve as a guide for clinicians assessing abdominal and pelvic conditions, as well as during surgeries that might require access to the lumbar spine.

In contrast, the posterior superior iliac spine (PSIS) is located at the S2 vertebra level, the spine of the scapula typically aligns with the T3-T4 vertebrae, and the iliac crest is generally at the level of L4-L5. Understanding these landmarks helps practitioners accurately evaluate and treat conditions relative to the lumbar spine and its associated anatomical structures.