. The chordates. Chordata. Reproduction 281. Fig. 232. Diagrammatic transverse section of the body of a vertebrate showing relations of organs to the peritoneum and coelom. (A) Dorsal aorta; (C) coelom; (EN) endodermal epithelium of digestive tube; (G) gonad; (1) integument; (K) kidney; (L) liver; (M) muscle layer of digestive tube; (MD) dorsal muscle of body- wall; (MV) ventral muscle of body-wall; (NC) position of embryonic notochord; (NT) neural tube (spinal cord); (PP) parietal peritoneum; (PV) visceral peri- toneum; (R) rib; (VC) vertebral column. (Courtesy, Neal and Rand: "Chordate
. The chordates. Chordata. Reproduction 281. Fig. 232. Diagrammatic transverse section of the body of a vertebrate showing relations of organs to the peritoneum and coelom. (A) Dorsal aorta; (C) coelom; (EN) endodermal epithelium of digestive tube; (G) gonad; (1) integument; (K) kidney; (L) liver; (M) muscle layer of digestive tube; (MD) dorsal muscle of body- wall; (MV) ventral muscle of body-wall; (NC) position of embryonic notochord; (NT) neural tube (spinal cord); (PP) parietal peritoneum; (PV) visceral peri- toneum; (R) rib; (VC) vertebral column. (Courtesy, Neal and Rand: "Chordate Anatomy," Philadelphia, The Blakiston Company.) interspersed, and the whole complex ensheathed by connective tissue and thereby delimited from adjacent tissues of the body-wall. The hypomeric mesoderm, later backed up by a layer of con- nective tissue, becomes the definitive peritoneum. Its somatic layer completely lines the body-wall. Its visceral layer covers the coelomic surfaces of the digestive tube and of all other organs which occupy the coelom. In the median plane at all regions not occupied by median organs (Fig. 228), the right and left visceral layers of the hypomere meet one another to coalesce and become membranes or mesenteries which connect and support the viscera. In later stages of development, the mesenteries undergo considerable reduction, especially those be- tween the digestive tube and the ventral body-wall (Figs. 230, 231). The mesenteries not only support the viscera but provide embryonic bridges across which nerves and blood-vessels pass from body-wall to viscera, or ducts (, the bile-duct) which traverse coelomic space between one organ and another. An adult blood-vessel may appear to. 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 Rand, Herbert W. (Herbert Wilbur), 1872-1
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