. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. INTRODUCTION. 9 side of the epiblast, and into a visceral layer (SpP*), which becomes attached to the hypoblast. The former, together with the epiblast to which it is united, constitutes the somatopleure, and the latter, together with the hypoblast, the splanchnopleure. The cavity separating these is the body-cavity, or coelome.' The upper part of the mesoblast, or that which lies on either side of the medullary cord and notochord (see p. 10), becomes separated from the lower, and segmented to f
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. INTRODUCTION. 9 side of the epiblast, and into a visceral layer (SpP*), which becomes attached to the hypoblast. The former, together with the epiblast to which it is united, constitutes the somatopleure, and the latter, together with the hypoblast, the splanchnopleure. The cavity separating these is the body-cavity, or coelome.' The upper part of the mesoblast, or that which lies on either side of the medullary cord and notochord (see p. 10), becomes separated from the lower, and segmented to form a series of mesoblastio MtrJ KW. Fir,. 8.—DIAGRAMMATIC TRANSVERSE SECTION THROUGH THE BODY OF AN ADULT VERTEBRATE. Med, spinal cord ; Nil, neural tube ; KW, body-wall ; Co, derma ; Ep, epidermis ; Vll, visceral tube ; Ao, aorta ; Ms, mesentery ; Per, parietal layer of the peri- toneum ; Per1, visceral layer of the peritoneum ; Msc, musculature of intes- tine ; Subm, connective-tissue coat of the intestine ; Ep, epithelium of intestine ; DH, lumen of intestine ; U', vertebral column. somites, or protovertebrse (Fig. 7, B, UW, 77), which lose their cavities, and eventually give rise to the vertebral column and longitudinal lateral muscles. The Vertebrate body is formed on a bilaterally symmetrical plan, and it may be described as consisting in the adult of two tubes, a dorsal and a ventral (Fig. 8, NR, VH}. The former, or cerebro-spinal cavity, encloses the central nervous system (brain and spinal cord), and may therefore be spoken of as the neural 1 The coelome may arise as a segmentally arranged series of outgrowths from the archenteron, as, , in Amphioxus (enterocoeles), or it maybe formed secondarily by a splitting (delamination) of the mesoblastic tissue (schizocoele). these must be considered as the most primitive. The first of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration a
Size: 1661px × 1504px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondonnewyorkmacmi
