Contents. 1  Overview. 2  Group of Neurons Forming Tracts. 3  Position of the Ascending Tracts. 4  Fasciculi Gracilis & Cuneatus Types of Fibers. Fasciculus Gracilis. 5  Spinothalamic Tracts Characteristics. Lateral Spinothalamic Tract. 6  Spinocerebellar Tract Posterior Spinocerebellar Tract. Anterior Spinocerebellar Tract. 7  Spinotectal Tract. 8  Spinoreticular Tract.