Accessory Process of Fourth Lumbar Vertebra (Left)
Processus accessorius vertebrae lumbalis quartae
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The accessory processes are the small, rough prominences found on the posterior aspects of the transverse processes of a lumbar vertebra.
They are the lumbar equivalents to the inferior tubercles that are found on the transverse processes of the twelfth thoracic vertebra and provide attachment sites for intertransversarii muscles.