Write short note on notochord.

Explanation

Notochord: Notochord is a solid, unjointed, stiff but flexible rod located in the middorsal line between the alimentery canal and the nerve cord in the embryo. Notochord provide support and points for muscle attachement. It is one of two diagnostic feature of phylum chordata. It persists throughout life in the lower chordates, but in the higher ones, it is surrounded or replaced in adult by a jointed vertebral column.