medullary cone

co·nus me·dul·la·'ris

[TA] the tapering lower extremity of the spinal cord. Synonym(s): medullary cone [TA]

med·ul·lar·y cone

(med'ŭ-lar'ē kōn) [TA] The tapering lower extremity of the spinal cord.
Synonym(s): conus medullaris [TA] .