dorsch (dorsh)

[Cf. G. dorsch, the haddock, E. torsk, q. v.] The young of the common cod. C IMG:content-3056.jpg:[blocks in formation] A linear depre ion, the primitive groove, makes its appearance on the surface of the blastoderm, and the substance of the mesoblast along each side of this groove grows up, carrying with it the superjacent epiblast. Thus are produced the two dorsal lamina . Huxley , Anat. Vert., p. 12. Dorsal muscles, in human an at., those muscles which lie upon the back. Those of the so-called first and second layers, however, pertain to the anterior extremity or fore limb. - Dorsal nerves, those spinal nerves which emerge IMG:content-3057.jpg:[merged small][merged small][ocr errors][merged small] in relation with dorsal vertebræ. Dorsal punctures, in entom., impre ed dots, few in number and determinate in position, found on the elytra of certain beetles, principally the Ca rabidæ. They are of great service in distinguishing species, and are not to be confounded with the ordinary irregular punctures of the surface. Dorsal segments, in entom., the segments of the abdomen, seen from above, and numbered from the base to the apex.- Dorsal surface, in entom., the upper surface of the of another s , articular or oblique proce , or pre zygapophysis;, lower do., or post zygapophysis. whole insect, including the elytra if these are present. - Dorsal suture, in bot . , the outer suture or ridge of a carpel or pod, corresponding to the midvein of the