The other two meningeal layers are the arachnoid mater and the pia mater. The dura surrounds the brain and the spinal cord and is responsible for keeping in the cerebrospinal fluid.he other two meningeal layers are the arachnoid mater and the pia mater. The dura surrounds the brain and the spinal cord and is responsible for keeping in the cerebrospinal fluid.
For 50 years, the stairs carried fans of the five city sports teams to and from the Polo Grounds in Harlem, until they finally rusted away in the years following the stadiumâs demolition, in 1964. John T. Brush, who built the stairway and donated it to the city, died the year before it opened to the public.
Arena polo (or indoor polo) is an affordable option for many who wish to play the sport, with rules similar to the regular version. The sport is played in a 300 feet by 150 feet enclosed arena, much like those used for other equestrian sports; the minimum size is 150 feet by 75 feet.