The " Stegosaurus " dinosaur had a greatly enlarged neural canal in the sacrum, characterized as a " posterior brain case ".
12.
Along the inner surface of both ventricles, the ventricular wall remains thin, and a choroid plexus develops, releasing CSF . The CSF quickly fills the neural canal.
13.
UMZC T836 was likely not a neurocentral sutures, but possibly also not fully-grown, as in at least some elements like the fifth vertebra, the notochordal canal is still connected to the neural canal through an hourglass-shaped opening.
14.
As the part of the primitive neural tube that will develop into the brainstem, the neural canal expands dorsally and laterally, creating the fourth ventricle, whereas the neural canal that does not expand and remains the same at the level of the midbrain superior to the fourth ventricle forms the cerebral aqueduct.
15.
As the part of the primitive neural tube that will develop into the brainstem, the neural canal expands dorsally and laterally, creating the fourth ventricle, whereas the neural canal that does not expand and remains the same at the level of the midbrain superior to the fourth ventricle forms the cerebral aqueduct.
