BKAIN MEMBRANES 



391 



a roughened outer surface which fits closely to the inner 

 surface of the bones, and forms the inner periosteum of 

 these bones. The brain side of this membrane is smooth, 



Fig. 180 — Human brain in place; C, C, wrinkled surface of the cerebrum; Cb, 

 cerebellum; M.Ob, medulla; iJ, bodies of vertebras, and 5, their spinous processes 

 inclosing the spinal cord. 



and the whole membrane is thick and fibrous. It lines the 

 whole cranial cavity, and ingrowths from this membrane 

 support and invest all parts of the brain. At the foramen 

 magnum it is continued as the outer coat of the cord. The 

 blood vessels which supply this membrane are, for the most 



