. Chordate morphology. Morphology (Animals); Chordata. notochord vertebral ring. MAMMAL r perichordol tube bony centrum nucleus pulposus in intervertebral body fibrous connective tissue of intervertebral body vertebra! ring B notochord' intervertebral body bony centrum .fibrous connective tissue ossified intervertebral body fused to centrum notochord FROG Figure 6-21. Vertebral as compared with intervertebral constriction of the notochord as observed in the mammal, A, and the frog, B. (After Remane, 1936) but in the caudal region it is thicker and the dorsal and ven- tral arch components becom
. Chordate morphology. Morphology (Animals); Chordata. notochord vertebral ring. MAMMAL r perichordol tube bony centrum nucleus pulposus in intervertebral body fibrous connective tissue of intervertebral body vertebra! ring B notochord' intervertebral body bony centrum .fibrous connective tissue ossified intervertebral body fused to centrum notochord FROG Figure 6-21. Vertebral as compared with intervertebral constriction of the notochord as observed in the mammal, A, and the frog, B. (After Remane, 1936) but in the caudal region it is thicker and the dorsal and ven- tral arch components become joined by a connective tissue band. Rhipidistian The vertebral column of Eusthenopteron is well known (Figure 6-25). In this type, the notochord is essentially unconstricted. There is a pair of large intercentra which ex- tend nearly around the notochord, with only a short gap separating the dorsal ends. The neural arch rests on the upper ends of the intercentra. Behind the base of the neural arch of either side, is a small interdorsal (or interneural) arch which is notched along its anterodorsal margin for the roots of the spinal nerve. The arrangement of parts is much like that in the ichthyostegid amphibian (Figure 6-16), and the similarity is carried even further in that a short rib articulates along a line beginning low on the intercentrum and ending on the ventral margin of the neural arch. The rib is, however, single-headed. The crossopterygians and some of the dipnoans seem to have essentially the same sort of vertebral column. That of ossified neural spine notochord | \\^ J. 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 Jollie, Malcolm. New York, Reinhold
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