- Preceding the sacrum in the spinal column; situated in front of the sacral vertebræ, as a vertebra; lumbar.
- n. Any vertebra in front of the sacrals, generally used in the plural.
Sorry, no etymologies found.
The procedure is called a presacral neurectomy, and it involves the cutting of nerve fibers that lead directly to your uterus and pelvis.
Posterior presacral vertebrae are extremely robust and possess fused ribs and the last presacral vertebra has been fused to the sacrum, a character that may be taxonomically useful.
The cut goes into the "presacral space," a cavity in the pelvis that is generally empty except for fat.
It retains some features present in extinct Cretaceous birds that are lacking in modern birds e.g., it has non-heterocoelous presacral vertebrae, but in general has many derived features.
Spongy somphospondylus presacral vertebrae; dorsal ribs plank-like with pneumatic cavities; iliac preacetabular process semicircular; scapular glenoid fossa bevelled medially
They have only six presacral vertebrae (eight is the typical number for toads), and of these the first two are fused (both characters are also seen in