Meninges Quiz: Accurately Describe the Meninges Functions

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Questions and Answers

What structures separate the lateral supratentorial compartments in the cranium?

Arachnoid granulations

Falx cerebelli (correct)

Tentorium cerebelli

Pia mater

How are dural sinuses formed?

By separation of falx cerebri from the cranium

By separation of the meningeal and periosteal dura at the tentorium cerebelli

By joining of two layers of arachnoid mater

By joining of two layers of meningeal dura at the free edges of dural septa (correct)

Which artery is a primary example of vessels that run between the periosteum and periosteal dura in the cranium?

Basilar artery

Internal jugular artery

Vestibulocochlear artery

Middle meningeal artery (correct)

Where does the blood collect in the dural sinuses from?

Connecting veins from the cortical surface and internal structures Signup and view all the answers

What can disrupt the middle meningeal artery and lead to dissection of connective tissue layers?

Skull fractures Signup and view all the answers

What forms an area of reduced adherence between the dura and the arachnoid?

Dural border cell area Signup and view all the answers

Which structure consists of areas where the meningeal portion of the dura folds inward to separate the cranial cavity into compartments?

Dural septa Signup and view all the answers

What can dissect the plane of weakness between the dura mater and arachnoid, leading to a subdural hematoma?

Cerebral vein Signup and view all the answers

What restricts the movement of the brain in the cranial cavity by separating it into compartments?

Dural septa Signup and view all the answers

Which structure is responsible for adding some support but also restricting brain movement in compartments within the cranial cavity?

Dura to arachnoid attachment Signup and view all the answers

Which of the following statements accurately describes the relationship between the dura mater and the arachnoid mater?

The dura mater is attached to the arachnoid mater by arachnoid granulations. Signup and view all the answers

The pia mater is derived from which of the following meningeal layers?

Endomeninx Signup and view all the answers

In the spinal cord, what is the relationship between the meningeal dura and the vertebral periosteum?

The meningeal dura is initially continuous with the vertebral periosteum but later separates, leaving an epidural space. Signup and view all the answers

What is the function of arachnoid granulations?

To allow for the passage of cerebrospinal fluid (CSF) from the subarachnoid space into the dural venous sinuses. Signup and view all the answers

Which of the following statements accurately describes the composition of the meningeal layers?

The dura mater consists primarily of fibroblasts and extracellular collagen in a dense, irregular arrangement. Signup and view all the answers

Study Notes

Dural Compartments

The dural septi form compartments in the cranial cavity, including lateral supratentorial compartments separated by the falx cerebri and an infratentorial compartment bordered by the tentorium cerebelli.
These rigid compartments limit the expansion of cranial contents and an expanding mass can push contents between compartments.

Dural Sinuses

Dural sinuses are venous structures formed by two mechanisms: separation of meningeal and periosteal dura at junctions with the skull, and joining of two layers of meningeal dura at the free edges of dural septa.
Blood collects in dural sinuses from connecting veins from the cortical surface and internal structures.

Dura-Blood Supply

The vascular supply for the dura in the cranium originates from several branches of the internal carotid artery.
In the spinal cord, the supply is from multiple sources located close to the vertebral column.
Vessels in the cranium run between the periosteum and the periosteal dura, often in grooves on the skull.
The middle meningeal artery is a primary example.

Skull Fractures and Hematomas

Skull fractures can disrupt arteries, producing dissection of the connective tissue layers and an expanding, space-occupying hematoma (epidural hematoma).

Meningeal Relationships

In adults, the meninges consist of three primary layers from the skull inward: dura mater (pachymeninx), arachnoid mater, and pia mater.
These layers consist of fibroblasts and extracellular collagen in various orientations and densities.

Dura Mater

The ectomeninx eventually divides into periosteal (endosteal) dura (outer layer) and meningeal dura (inner layer).
In the spinal cord, the ectomeninx is initially continuous with the vertebral periosteum during development, but later separates, leaving an epidural space between the vertebral periosteum and the meningeal dura.

Dural Border Cell Area

The dural border cell area between the dura and arachnoid is a third, thinner and weaker dural layer.
This layer forms an area of reduced adherence between the dura and the arachnoid and a potential space.

Bleeding and Hematomas

Bleeding, typically by a cerebral vein, can dissect the plane of weakness between the dura mater and the arachnoid (subdural hematoma).
When the brain is removed from a cadaver, the arachnoid may split away from the dura at this layer.

Dural Septa

The dura has extensions directed away from the skull into the cranial cavity, forming compartments that restrict the movement of the brain.
Injuries such as an expanding lesion or bleeding can force areas of the brain between compartments.

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Description

Test your knowledge on the compartments formed by dural septi and dural sinuses as discussed in Haines Chapter 7. Learn about the lateral supratentorial compartments, infratentorial compartment, and how dural sinuses play a role in the cranial anatomy.

Meninges