Tuberculosis of the spine commonly affects all of the following pas of the veebra, EXCEPT:

The hematogenous spread of TB bacilli is believed to be responsible for Pott's disease. It may also spread lymphatics. The commonest type of TB spine is the paradiscal type. Posterior segment structures of the spine are very rarely affected in TB of spine. Since the spinous process is the posterior most structure it is rarely affected. Neural arches, transverse process and spinous process are structures which are rarely involved. Ref: Identification of Pathological Conditions in Human Skeletal Remains By Donald J. One, 2nd Edition, Page 225 ; Essentials of Tuberculosis in Children By Vimlesh Seth, 3rd Edition, Page 262.