资料来源 : pyDict

上脊索

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Epichordal \Ep`i*chor"dal\, a. [Pref. epi- + chordal.] (Anat.)
   Upon or above the notochord; -- applied esp. to a vertebral
   column which develops upon the dorsal side of the notochord,
   as distinguished from a perichordal column, which develops
   around it.