. Elementary text-book of zoology [electronic resource]. Zoology. Mouth. inner as endoderm, and the space enclosed by them is the archenteron. The third type is the tridermic (or triplo- blastie). In it there can be discerned, at least in early stages, three distinct primary layers or epithelia. Nearly all the higher animals are tridermic. In tridermic forms, the outer and inner layers are called the ectoderm e/ito- derm, whilst the middle layer is the mesoderm. The space Fig. 3.—Diagram of a Tridermic Organism, seen in CROSS section. f. Note^the somatic and splanchnic layers of mesoderm joine
. Elementary text-book of zoology [electronic resource]. Zoology. Mouth. inner as endoderm, and the space enclosed by them is the archenteron. The third type is the tridermic (or triplo- blastie). In it there can be discerned, at least in early stages, three distinct primary layers or epithelia. Nearly all the higher animals are tridermic. In tridermic forms, the outer and inner layers are called the ectoderm e/ito- derm, whilst the middle layer is the mesoderm. The space Fig. 3.—Diagram of a Tridermic Organism, seen in CROSS section. f. Note^the somatic and splanchnic layers of mesoderm joined by dorsal and ventral mesenteries. in the entoderm is now called the mesenteron, and the cavity in the mesoderm is the coe/om; the space between the three layers is termed the hcBmocoele, or blood-space, because it becomes the blood-vascular system. In diploblastic forms. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Masterman, Arthur Thomas; Parsons, John Herbert, Sir, 1868-1957, donor; S. H. Lazarus (Firm); University College, London. Library Services. Edinburgh : E. & S. Livingstone
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1901
