更多centra例句

1. He found that the vertebral centra were first formed as rings in the chorda-sheath, which give off neural and hæmal processes.
2. This sheath forms the basis of the centra of the future vertebr.
3. This is the remaining substance of the notochord, which finds room between the cup-shaped sides of the centra.
4. Column notochordal, showing no traces of centra; well-marked neural and hæmal elements.
5. On the other hand, the vertebræ have continuous centra, showing definite processes.