so·mat·o·pleure 
(sō-mătə-plr′, sōmə-tə-)
(sō-mătə-plr′, sōmə-tə-)n.
A layer of cells in a vertebrate embryo, formed by association of part of the mesoderm with the ectoderm and developing as the internal body wall.
[New Latin somatopleura : SOMATO- + Greek pleura, side.]
so·mat′o·pleural (-plrəl), so·mat′o·pleuric (-plrĭk) adj.