Podcast
Questions and Answers
Which sinus is enclosed in the posterior 2/3 of the lower margin of the falx cerebri?
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?
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?
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?
Which structure is related to the medial surface of the corresponding cerebral hemispheres?
What is the shape of the inferior surface of the tentorium cerebelli?
What is the shape of the inferior surface of the tentorium cerebelli?
What is attached to the posterior clinoid process and the lips of the superior petrosal sulcus?
What is attached to the posterior clinoid process and the lips of the superior petrosal sulcus?
Where is the basilar plexus of sinuses located?
Where is the basilar plexus of sinuses located?
What is the name of the sinus that lies along the posterior free margin of the lesser wing of the sphenoid?
What is the name of the sinus that lies along the posterior free margin of the lesser wing of the sphenoid?
What is the superior relation of the cavernous sinus?
What is the superior relation of the cavernous sinus?
What is the length of the cavernous sinus?
What is the length of the cavernous sinus?
What is the termination of the sphenoparietal sinus?
What is the termination of the sphenoparietal sinus?
What is the characteristic structure of the cavernous sinus?
What is the characteristic structure of the cavernous sinus?
What is the main function of the Skeletal Coverings of the central nervous system?
What is the main function of the Skeletal Coverings of the central nervous system?
Which meningeal layer is directly related to the bone of the skull or cranial cavity?
Which meningeal layer is directly related to the bone of the skull or cranial cavity?
What is the name of the dural fold that lies between the two cerebral hemispheres?
What is the name of the dural fold that lies between the two cerebral hemispheres?
Where does the dura mater terminate?
Where does the dura mater terminate?
What is the name of the space that contains the internal vertebral venous plexus?
What is the name of the space that contains the internal vertebral venous plexus?
Which of the following is NOT a type of meningeal covering?
Which of the following is NOT a type of meningeal covering?
What is the function of the arachnoid mater?
What is the function of the arachnoid mater?
Which of the following structures is NOT a dural fold?
Which of the following structures is NOT a dural fold?
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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
- Features:
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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