The superior, or upper tubercle is the mammillary process which connects with the superior articular process.
2.
The multifidus muscle attaches to the mammillary process and this muscle extends through the length of the vertebral column, giving support.
3.
Three portions or " tubercles " can be noticed in a transverse process of a lower lumbar vertebrae : the lateral or " costiform process ", the " mammillary process ", and the " accessory process ".