1. Denticulate Describing a leaf margin that is finely toothed.

2. Calyx segment margin denticulate or serrate, at least once near apex.

3. Conclusions Denticulate ligament was a mark and could be used to identify and localize the spinal nerve anterior and posterior roots in the SPR or SAR, especially for the cervical nerve roots.

4. Valves 1 or 2 or all with tubercles, margin denticulate .

5. Results: The ventral roots lay in front of the denticulate ligament, while the dorsal one behind it.