[TA] the threadlike termination of the spinal dura mater, surrounding and fused to the filum terminale of the cord, and attached to the deep dorsal sacrococcygeal ligament; extends from S2-3 to Co2 vertebral levels.terminal filum. SYN: coccygeal ligament*, filum terminale externum*, filum durae matris spinalis, filum of spinal dura mater.
