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.
A polo match is usually played outdoors. A polo field is 300 yards long and 160 yards wide, the largest field in organized sport. A polo match lasts about one and one-half hours and is divided into timed periods called chukkers.