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.
Polo is played on an outdoor grass field 300 yards (274.3 m) long by 160 yards wide. Centred at each end are lightweight goalposts 8 yards apart. A score is made by hitting the ball between the goalposts. Play begins with the two teams of four lined up facing each other in the centre of the field.