Letter D is pointing to which canal?

Letter A is pointing to which structure or membrane?

 Name the Blue highlighted structure.

 What is the colored part called. Letter D

 Which nerve is this? Letter C.  Use the name not number.

 Together these 3 bones are known as the _______________.

How many pairs of sacral nerves are there?

 Name the crack the arrow is pointing to.

Name the blue highlighted structure. Hint: it is just superior to the foramen magnum.

Name the meninge that is closest to the spinal cord. Letter D.