Meninges, singular meninx, three membranous envelopes—pia mater, arachnoid, and dura mater—that surround the brain and spinal cord. Cerebrospinal fluid fills the ventricles of the brain and the space between the pia mater and the arachnoid.
What is between the dura and arachnoid mater?
The subdural space is the space that potentially exists between the meningeal layer of the dura and the arachnoid mater. Similar to the epidural space, the subdural space typically exists only under pathological conditions.
What is the space within the meninges of the spinal cord?
The middle layer of meninges is arachnoid, which resembles a cobweb in appearance, is a thin layer with numerous threadlike strands that attach it to the innermost layer. The space under the arachnoid, the subarachnoid space, is filled with cerebrospinal fluid and contains blood vessels.
What is the center of your brain called?
The basal ganglia are a cluster of structures in the center of the brain. The basal ganglia coordinate messages between multiple other brain areas. The cerebellum is at the base and the back of the brain. The cerebellum is responsible for coordination and balance.
Why is there no epidural space in the brain?
The epidural space contains blood vessels (veins) and fat. The dura mater surrounding the brain, the cerebral dura, in contrast adheres to inner periostal lining of the skull bones. So there is no (normally) epidural space, but such space may arise in case of bleeding (epidural bleeding).
Which meninges is vascular?
Together, the arachnoid and pia mater comprise the leptomeninges. Most of the blood supply to the cranial dura mater comes from meningeal arteries originating from the internal carotid artery, vertebral artery, and external carotid artery (Fig. 1).
How does arachnoid mater protect the brain?
Arachnoid mater: Connected to the dura mater on the side closest to the CNS, this middle layer includes a network of fibers and collagen that are part of the suspension system that helps protect the brain and spinal cord from sudden impact. … It has blood vessels that deliver oxygen and nutrients to the spinal cord.
What is the function of dura mater?
The dura mater is a sac that envelops the arachnoid and has been modified to serve several functions. The dura mater surrounds and supports the large venous channels (dural sinuses) carrying blood from the brain toward the heart. The dura mater is partitioned into several septa, which support the brain.
Which is least likely to get through the blood brain barrier?
As part of the trial, following the laser therapy, patients are dosed with doxorubicin, a powerful chemotherapy drug known as one of the least likely to get through the blood-brain barrier.
What is the most common vertebral level of the termination of the spinal cord in adults?
The spinal cord ends at the level of vertebrae L1–L2, while the subarachnoid space —the compartment that contains cerebrospinal fluid— extends down to the lower border of S2. Lumbar punctures in adults are usually performed between L3–L5 (cauda equina level) in order to avoid damage to the spinal cord.