Nancy, a 24-year-old nurse, took a day off work as she had a headache. Over the day her headache worsened, she became intolerant to light, and she developed a rash on her legs and chest. Nancy's...

Nancy, a 24-year-old nurse, took a day off work as she had a headache. Over the day her headache worsened, she became intolerant to light, and she developed a rash on her legs and chest. Nancy's mother rushed her into hospital where a lumbar puncture was performed to gather a sample of cerebrospinal fluid. The lumbar puncture revealed that Nancy had meningitis. Meningitis is caused by an infection of the cerebrospinal fluid resulting in inflammation of the meninges.

 a)    What are the meninges?

 b)    Name the meningeal layers that surround the brain and spinal cod and explain the relative location of each.

c)    What is cerebrospinal fluid and what is its function?

  d)    Which meningeal layers would the doctor need to pierce with the needle in order to collect a sample of cerebrospinal fluid?