Features of the Falx Cerebri

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Questions and Answers

Which sinus is enclosed in the posterior 2/3 of the lower margin of the falx cerebri?

Transverse sinus

Inferior sagittal sinus (correct)

Straight sinus

Superior sagittal sinus

What is the attachment site of the superior surface of the tentorium cerebelli?

Cerebellum

Cerebrum

Brainstem

Falx cerebri (correct)

What is the shape of the upper margin of the falx cerebri?

Serrated

Straight

Concave

Convex (correct)

Which structure is related to the medial surface of the corresponding cerebral hemispheres?

Right and left surfaces of the falx cerebri Signup and view all the answers

What is the shape of the inferior surface of the tentorium cerebelli?

Concave Signup and view all the answers

What is attached to the posterior clinoid process and the lips of the superior petrosal sulcus?

Attached border of the tentorium cerebelli Signup and view all the answers

Where is the basilar plexus of sinuses located?

Over the basilar part of the occipital bone Signup and view all the answers

What is the name of the sinus that lies along the posterior free margin of the lesser wing of the sphenoid?

Sphenoparietal sinus Signup and view all the answers

What is the superior relation of the cavernous sinus?

All of the above Signup and view all the answers

What is the length of the cavernous sinus?

2 cm Signup and view all the answers

What is the termination of the sphenoparietal sinus?

In the cavernous sinus Signup and view all the answers

What is the characteristic structure of the cavernous sinus?

Spongy structure Signup and view all the answers

What is the main function of the Skeletal Coverings of the central nervous system?

To protect the CNS from mechanical injuries Signup and view all the answers

Which meningeal layer is directly related to the bone of the skull or cranial cavity?

Dura mater (outer layer) Signup and view all the answers

What is the name of the dural fold that lies between the two cerebral hemispheres?

Falx cerebri Signup and view all the answers

Where does the dura mater terminate?

At the level of S2 Signup and view all the answers

What is the name of the space that contains the internal vertebral venous plexus?

Epidural space Signup and view all the answers

Which of the following is NOT a type of meningeal covering?

Epidural mater Signup and view all the answers

What is the function of the arachnoid mater?

To cushion the CNS from mechanical shocks Signup and view all the answers

Which of the following structures is NOT a dural fold?

Pia mater Signup and view all the answers

Study Notes

Dural Folds

Falx Cerebri:
- Site: median longitudinal fissure between two cerebral hemispheres
- Beginning: near foramen magnum
- Termination: in confluence of sinuses
- Features:
  - Apex: narrow, attached to crista galli
  - Base: broad, attached to tentorium cerebelli
  - Upper margin: convex, attached to lips of sagittal sulcus
  - Lower margin: concave, free, enclosing inferior sagittal sinus
- Sinuses enclosed:
  - Superior sagittal sinus
  - Inferior sagittal sinus
  - Straight sinus
Tentorium Cerebelli:
- Site: between cerebellum and cerebrum
- Features:
  - Two surfaces: superior and inferior
  - Two borders: attached and free
  - Attached border: attached to posterior clinoid process and lips of superior petrosal sulcus
- Inferior surface: concave to fit superior convex surface of cerebellum

Meninges

Definition: three layers of meninges covering the central nervous system (CNS)
Layers:
- Pia mater
- Arachnoid mater
- Dura mater (2 layers: endosteal and meningeal)
Dura Mater:
- Features:
  - Delicate, non-vascular membrane
  - Terminates at S2
- Dural folds:
  - Falx cerebri
  - Tentorium cerebelli
  - Falx cerebelli

Venous Sinuses

Superior sagittal sinus: in upper convex margin of falx cerebri
Inferior sagittal sinus: in posterior 2/3 of lower margin of falx cerebri
Straight sinus: within junction of falx cerebri and tentorium cerebelli
Intercavernous sinuses: three in number, connecting cavernous sinuses of two sides
Basilar plexus of sinuses: over basilar part of occipital bone, connecting inferior petrosal sinuses of two sides
Paired sinuses:
- Sphenoparietal sinus: along posterior free margin of lesser wing of sphenoid, terminating in cavernous sinus
- Cavernous sinus: large venous space between two layers of dura, with spongy structure
- Inferior petrosal sinus
- Superior petrosal sinus
- Sigmoid sinus
- Transverse sinus

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Description

Identify the different parts of the falx cerebri, a dural fold in the skull, including its apex, base, margins, and surfaces. Understand their attachments and relationships with surrounding structures.