Arachnoid mater

This tutorial by Matt from Kenhub explores the arachnoid mater, the middle layer of the meninges, which protects the central nervous system. It covers the structure and function of the arachnoid mater, including its role in cerebrospinal fluid circulation. The video explains the subdural and subarachnoid spaces, highlighting their significance in brain protection and CSF flow. Unique features of cranial arachnoid mater, such as subarachnoid cisterns and arachnoid villi, are discussed, emphasizing their roles in CSF absorption. The tutorial concludes with a promotion of Kenhub's anatomy learning resources.

What is the arachnoid mater's position among the layers of the meninges?

• Outermost layer

• Middle layer

• Innermost layer

• Not part of the meninges

What is the subdural space?

• A space within the brain

• A space filled with blood vessels

• A potential space between the dura mater and arachnoid mater

• A space between the arachnoid and pia mater

What is the function of the subarachnoid space?

• To protect the skull

• To connect the brain to the spinal cord

• To provide a pathway for CSF circulation

• To store blood

Which feature is unique to cranial arachnoid mater?

• Subdural space

• Arachnoid trabeculae

• Subarachnoid cisterns

• Dural sac

Where is the lumbar cistern located?

• In the superior sagittal sinus

• Between the dura and arachnoid mater

• At the termination of the spinal canal

• In the brain

What is the role of arachnoid villi?

• To connect the brain to the spinal cord

• To protect the brain from trauma

• To reabsorb CSF into the venous blood

• To produce cerebrospinal fluid

Where are arachnoid granulations primarily located?

• In the spinal cord

• Within the superior sagittal sinus

• In the subdural space

• In the lumbar cistern