[TA] a compact bundle composed of descending branches of posterior root fibers located near the border between the fasciculi gracilis and cuneatus of the cervical and thoracic spinal cord; it corresponds to the septomarginal fasciculus, Hoche tract, or oval area of Flechsig in the lumbar, and to the triangle of Philippe-Gombault in the sacral spinal segments; like these, it can be demonstrated only in cases of demyelination resulting from dorsal root lesions. SYN: fasciculus interfascicularis [TA], interfascicular fasciculus [TA], fasciculus semilunaris*, comma bundle of Schultze, comma tract of Schultze.