Dura mater. Dura mater, or dura, is a thin membrane that is the outermost of the three layers of the meninges that surround the brain and spinal cord. It is derived from mesoderm. The other two meningeal layers are the pia mater and the arachnoid mater.ura mater. Dura mater, or dura, is a thin membrane that is the outermost of the three layers of the meninges that surround the brain and spinal cord. It is derived from mesoderm. The other two meningeal layers are the pia mater and the arachnoid mater.
The story with the most credibility is the one that, the PiÃ±a Colada was introduced on August 15, 1954 at the Caribe Hiltonâs Beachcomber Bar in San Juan, Puerto Rico by its alleged creator, Ramon âMonchitoâ Marrero.
The drink was first made in the 1890s by pharmacist Caleb Bradham in New Bern, North Carolina. The brand was trademarked on June 16, 1903. There have been many Pepsi va â¦ riants produced over the years since 1898.