mesoblastic segment
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segment — 1. A section; a part of an organ or other structure delimited naturally, artificially, or by invagination from the remainder. SYN: segmentum [TA]. SEE ALSO: metamere. 2. A territory of an organ having independent function, supply, or drainage. 3 … Medical dictionary
somite — One of the paired, metamerically arranged cell masses formed in the early embryonic paraxial mesoderm; commencing in the third or early fourth week in the region of the hindbrain, they develop in a caudal direction typically until 42 pairs are… … Medical dictionary
