12. Central Nervous System

Meninges and the Blood Brain Barrier 

CNS Protection

The Meninges

 The blood brain barrier is a protective mechanism that helps maintain a stable environment for the brain. 

 Which of the following protects the brain from bloodborne metabolic wastes and most drugs?  

Circulation of Cerebrospinal Fluid (CSF) Through Ventricles

Location and circulation of CSF

The Cerebrospinal Fluid CSF

 The arachnoid mater, or arachnoid, forms a loose brain covering, never dipping into the sulci at the cerebral surface. 

 Which of the following meninges forms the loose, mid-layer brain covering?  

 The pituitary gland secretes hormones and does not produce cerebrospinal fluid. 

 Dura mater is a meningeal layer and does not produce cerebrospinal fluid. 

 Mammillary bodies function in olfactory pathways and do not produce cerebrospinal fluid. 

 What structure produces cerebrospinal fluid? 

Blood-Brain Barrier

 The arachnoid mater is the middle layer of the meninges. 

 Of the three meningeal layers that surround the CNS, which one is located in the middle? 

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